Hi, I noticed several big performance regressions with polars 2, this is the first one where I was able to isolate a MWE. `gather_every()` takes 20x as long since polars 2, I compared 2.1.0 with 1.44.2. Both less than a microsecond here, but for more repetitions it matters and...
...together with mean returns and observation counts. That query used over 80 GB before failing on my 24 GiB Mac, so I moved it to DuckDB. The [updated analysis](https://iangow.github.io/polars-analysis/analysis.html) contains the original query, synthetic-data benchmarks and the...
### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars. ### Reproducible example ### Log output ### Issue description Reading 5 rows from a 2.5 GiB...
### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars. ### Reproducible example ### Log output ### Issue description In Polars 2.0.0, calling...
...any data is read. In our pipeline this burst of requests overloaded our S3 provider. Workaround: open the table once and pass the `DeltaTable` to `pl.scan_delta`. ### Expected behavior The table is opened once per `scan_delta` call, whatever the number of branches. ### Installed...
### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars. ### Reproducible example Output: ### Log output ### Issue description `strict=True` (the...
### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars. ### Reproducible example Output: ### Log output ### Issue description The lazy query should...
### Description Description Polars SQL can't name nested types. `STRUCT ` and `MAP(...)` parse, but are then rejected: Proposal: map `STRUCT ` to `pl.Struct` and `MAP(KEY, VALUE)` to `pl.Map`, wherever SQL accepts a type: `CAST` / `::`, `CREATE TABLE`, and the `schema` /...
### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars. ### Reproducible example ### Log output ### Issue description Selecting `pl.len()` from a...
### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars. ### Reproducible example ### Log output ### Issue description By default, Delta writers...
### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars. ### Reproducible example ### Log output ### Issue description Polars 1.44.1 (and 2.0.0)...
### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars. ### Reproducible example ### Log output ### Issue description Decimal filter condition gets...
### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars. ### Reproducible example ### Log output ### Issue description See repro. Regression from 2.0...
...real evidence is the instruction-level match and the upstream fix. Possibly related open issues with the same Windows `0xc0000005` shape: #26617 (long-lived worker, "needs repro"), #23142, and #28961 (Windows CI access violations, handled by skipping tests). **Ask:** pick up a...
### Description In different functions, string arguments are interpreted differently: in some cases, the string is perceived as a string literal, in others - as a column name This creates confusion and leads to non‑obvious behavior E.g.: However, fixing this would result in the...
### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the latest version of Polars. ### Reproducible example ### Log output ### Issue description This is the shape of TPC-H Q11 (`HAVING value > SUM(...) * (0.0001...
### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars. ### Reproducible example n/a (see below) ### Issue description I have two real-world scripts...
### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the latest version of Polars. ### Reproducible example ### Log output ### Issue description When caches are nested, the projection between the two caches is...
...and then left-joins the latest snapshot of the source (`filter(col == col.max())`). Workaround: express the max filter as a semi join, e.g. `lf.join(lf.select(pl.col("v").max()), on="v", how="semi")`. ### Expected behavior The query collects without panicking and returns the...
### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars. ### Reproducible example ### Log output ### Issue description `schema_overrides` is silently...
### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars. ### Reproducible example ### Log output ### Issue description It seems there is a regression...
In https://github.com/pola-rs/polars/pull/28984 we added basic support for the `Map` dtype, but we left a couple of follow-ups that should be done after the initial PR is merged.
23 posts from 16 people in 1 place, about 3 a week over 56 days. Mostly on pola-rs/polars. Tools named alongside: PyPI, GitHub, Streamlit, DuckDB.
Frustration Frustration 0 of 3· Seen on GitHub issues
Summary, model-written
Polars users encounter regressions in recent updates, including silently ignored schema overrides and errors when executing operations like selecting length.
How it was grouped
Posts that state a pain and match the "breaking-changes" rule about Polars. First post Sep 3, 2026, latest Oct 28, 2026. Corroborated: 3 or more posts from 2 or more people or places. Method
Top post: "Compare lists in one column to the first n elements of another column in Python Polars lazyframes, where n is", one of 20 posts from 16 people on GitHub issues, Stack Overflow.
Top post: "Streaming engine: multi-column `.unique()` in `group_by().agg()` much slower than in-memory", one of 7 posts from 4 people on GitHub issues.
Top post: "polars.read_excel() value error on very large date", one of 3 posts from 3 people on GitHub issues.
History
Momentum went from steady to fading.
Nov 3, 2026
Momentum went from fading to steady.
Nov 2, 2026
Momentum went from steady to fading.
Oct 30, 2026
Momentum went from fading to steady.
Oct 28, 2026
Momentum went from steady to fading.
Oct 27, 2026
Summary written by a model: Polars users encounter regressions in recent updates, including silently ignored schema overrides and errors when executing operations like selecting length.
Hi, I noticed several big performance regressions with polars 2, this is the first one where I was able to isolate a MWE. `gather_every()` takes 20x as long since polars 2, I compared 2.1.0 with 1.44.2. Both less than a microsecond here, but for more repetitions it matters and...
...together with mean returns and observation counts. That query used over 80 GB before failing on my 24 GiB Mac, so I moved it to DuckDB. The [updated analysis](https://iangow.github.io/polars-analysis/analysis.html) contains the original query, synthetic-data benchmarks and the...
### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars. ### Reproducible example ### Log output ### Issue description Reading 5 rows from a 2.5 GiB...
### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars. ### Reproducible example ### Log output ### Issue description In Polars 2.0.0, calling...
...any data is read. In our pipeline this burst of requests overloaded our S3 provider. Workaround: open the table once and pass the `DeltaTable` to `pl.scan_delta`. ### Expected behavior The table is opened once per `scan_delta` call, whatever the number of branches. ### Installed...
### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars. ### Reproducible example Output: ### Log output ### Issue description `strict=True` (the...
### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars. ### Reproducible example Output: ### Log output ### Issue description The lazy query should...
### Description Description Polars SQL can't name nested types. `STRUCT ` and `MAP(...)` parse, but are then rejected: Proposal: map `STRUCT ` to `pl.Struct` and `MAP(KEY, VALUE)` to `pl.Map`, wherever SQL accepts a type: `CAST` / `::`, `CREATE TABLE`, and the `schema` /...
### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars. ### Reproducible example ### Log output ### Issue description Selecting `pl.len()` from a...
### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars. ### Reproducible example ### Log output ### Issue description By default, Delta writers...
### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars. ### Reproducible example ### Log output ### Issue description Polars 1.44.1 (and 2.0.0)...
### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars. ### Reproducible example ### Log output ### Issue description Decimal filter condition gets...
### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars. ### Reproducible example ### Log output ### Issue description See repro. Regression from 2.0...
...real evidence is the instruction-level match and the upstream fix. Possibly related open issues with the same Windows `0xc0000005` shape: #26617 (long-lived worker, "needs repro"), #23142, and #28961 (Windows CI access violations, handled by skipping tests). **Ask:** pick up a...
### Description In different functions, string arguments are interpreted differently: in some cases, the string is perceived as a string literal, in others - as a column name This creates confusion and leads to non‑obvious behavior E.g.: However, fixing this would result in the...
### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the latest version of Polars. ### Reproducible example ### Log output ### Issue description This is the shape of TPC-H Q11 (`HAVING value > SUM(...) * (0.0001...
### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars. ### Reproducible example n/a (see below) ### Issue description I have two real-world scripts...
### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the latest version of Polars. ### Reproducible example ### Log output ### Issue description When caches are nested, the projection between the two caches is...
...and then left-joins the latest snapshot of the source (`filter(col == col.max())`). Workaround: express the max filter as a semi join, e.g. `lf.join(lf.select(pl.col("v").max()), on="v", how="semi")`. ### Expected behavior The query collects without panicking and returns the...
### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars. ### Reproducible example ### Log output ### Issue description `schema_overrides` is silently...
### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars. ### Reproducible example ### Log output ### Issue description It seems there is a regression...
In https://github.com/pola-rs/polars/pull/28984 we added basic support for the `Map` dtype, but we left a couple of follow-ups that should be done after the initial PR is merged.
23 posts from 16 people in 1 place, about 3 a week over 56 days. Mostly on pola-rs/polars. Tools named alongside: PyPI, GitHub, Streamlit, DuckDB.
Frustration Frustration 0 of 3· Seen on GitHub issues
Summary, model-written
Polars users encounter regressions in recent updates, including silently ignored schema overrides and errors when executing operations like selecting length.
How it was grouped
Posts that state a pain and match the "breaking-changes" rule about Polars. First post Sep 3, 2026, latest Oct 28, 2026. Corroborated: 3 or more posts from 2 or more people or places. Method
Top post: "Compare lists in one column to the first n elements of another column in Python Polars lazyframes, where n is", one of 20 posts from 16 people on GitHub issues, Stack Overflow.
Top post: "Streaming engine: multi-column `.unique()` in `group_by().agg()` much slower than in-memory", one of 7 posts from 4 people on GitHub issues.
Top post: "polars.read_excel() value error on very large date", one of 3 posts from 3 people on GitHub issues.
History
Momentum went from steady to fading.
Nov 3, 2026
Momentum went from fading to steady.
Nov 2, 2026
Momentum went from steady to fading.
Oct 30, 2026
Momentum went from fading to steady.
Oct 28, 2026
Momentum went from steady to fading.
Oct 27, 2026
Summary written by a model: Polars users encounter regressions in recent updates, including silently ignored schema overrides and errors when executing operations like selecting length.
Oct 24, 2026
Momentum went from fading to steady.
Oct 24, 2026
Momentum went from steady to fading.
Oct 20, 2026
Momentum went from rising to steady.
Oct 19, 2026
Momentum went from fading to rising.
Oct 15, 2026
Momentum went from steady to fading.
Oct 13, 2026
Momentum went from rising to steady.
Oct 9, 2026
on main","excerpt":"### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars. ### Reproducible example ### Log output ### Issue description Regression from #29971:...","author":"kdn36","day":"2026-10-23","score":0,"comments":1,"entities":["polars","pypi"],"frustration":0,"sourceName":"pola-rs/polars"},{"id":"github:pola-rs/polars#30090","kind":"github","source":"gh:pola-rs/polars","url":"https://github.com/pola-rs/polars/issues/30090","title":"`scan_delta`: table opened several times when a scan is reused across plan branches (regression in 1.43)","excerpt":"...any data is read. In our pipeline this burst of requests overloaded our S3 provider. Workaround: open the table once and pass the `DeltaTable` to `pl.scan_delta`. ### Expected behavior The table is opened once per `scan_delta` call, whatever the number of branches. ### Installed...","author":"loic-bellinger","day":"2026-10-20","score":0,"comments":1,"entities":["polars","pypi"],"frustration":0,"sourceName":"pola-rs/polars"},{"id":"github:pola-rs/polars#30078","kind":"github","source":"gh:pola-rs/polars","url":"https://github.com/pola-rs/polars/issues/30078","title":"Strict `cast(pl.Datetime(\"ns\"))` expression on a `Datetime(\"us\"/\"ms\")` column returns null for out-of-range values instead of raising (regression in 1.43.0)","excerpt":"### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars. ### Reproducible example Output: ### Log output ### Issue description `strict=True` (the...","author":"hanke580","day":"2026-10-20","score":0,"comments":1,"entities":["polars","pypi"],"frustration":0,"sourceName":"pola-rs/polars"},{"id":"github:pola-rs/polars#30079","kind":"github","source":"gh:pola-rs/polars","url":"https://github.com/pola-rs/polars/issues/30079","title":"`group_by(..., maintain_order=True).agg(...).head(n).sort(...)` returns arbitrary groups: optimizer drops `maintain_order` although a slice sits between group-by and sort","excerpt":"### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars. ### Reproducible example Output: ### Log output ### Issue description The lazy query should...","author":"hanke580","day":"2026-10-20","score":0,"comments":0,"entities":["polars","pypi"],"frustration":0,"sourceName":"pola-rs/polars"},{"id":"github:pola-rs/polars#29939","kind":"github","source":"gh:pola-rs/polars","url":"https://github.com/pola-rs/polars/issues/29939","title":"SQL: support STRUCT and MAP type names","excerpt":"### Description Description Polars SQL can't name nested types. `STRUCT ` and `MAP(...)` parse, but are then rejected: Proposal: map `STRUCT ` to `pl.Struct` and `MAP(KEY, VALUE)` to `pl.Map`, wherever SQL accepts a type: `CAST` / `::`, `CREATE TABLE`, and the `schema` /...","author":"kdn36","day":"2026-10-14","score":0,"comments":0,"entities":["polars"],"frustration":0,"sourceName":"pola-rs/polars"},{"id":"github:pola-rs/polars#29910","kind":"github","source":"gh:pola-rs/polars","url":"https://github.com/pola-rs/polars/issues/29910","title":"Panic when selecting pl.len() from a lazy sink (regression in 1.40)","excerpt":"### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars. ### Reproducible example ### Log output ### Issue description Selecting `pl.len()` from a...","author":"gdementen","day":"2026-10-13","score":1,"comments":1,"entities":["polars","pypi"],"frustration":0,"sourceName":"pola-rs/polars"},{"id":"github:pola-rs/polars#29919","kind":"github","source":"gh:pola-rs/polars","url":"https://github.com/pola-rs/polars/issues/29919","title":"`scan_delta` filter on a struct column fails with \"cast from `struct[1]` to `struct[5]`\" when Delta stats cover only some of the struct's fields","excerpt":"### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars. ### Reproducible example ### Log output ### Issue description By default, Delta writers...","author":"AlexanderNenninger","day":"2026-10-13","score":0,"comments":0,"entities":["polars","pypi"],"frustration":0,"sourceName":"pola-rs/polars"},{"id":"github:pola-rs/polars#29925","kind":"github","source":"gh:pola-rs/polars","url":"https://github.com/pola-rs/polars/issues/29925","title":"Possible regression between 1.43.2 and 1.44.1: \"could not extract number from any-value of dtype: 'Null'\"","excerpt":"### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars. ### Reproducible example ### Log output ### Issue description Polars 1.44.1 (and 2.0.0)...","author":"etiennebacher","day":"2026-10-13","score":0,"comments":0,"entities":["polars","pypi"],"frustration":0,"sourceName":"pola-rs/polars"},{"id":"github:pola-rs/polars#29901","kind":"github","source":"gh:pola-rs/polars","url":"https://github.com/pola-rs/polars/issues/29901","title":"Decimal filter bound gets dropped","excerpt":"### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars. ### Reproducible example ### Log output ### Issue description Decimal filter condition gets...","author":"kdn36","day":"2026-10-12","score":1,"comments":1,"entities":["polars","pypi"],"frustration":0,"sourceName":"pola-rs/polars"},{"id":"github:pola-rs/polars#29902","kind":"github","source":"gh:pola-rs/polars","url":"https://github.com/pola-rs/polars/issues/29902","title":"Lazy `select` sharing aggregates over multi-chunk frame loses rows","excerpt":"### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars. ### Reproducible example ### Log output ### Issue description See repro. Regression from 2.0...","author":"kdn36","day":"2026-10-12","score":1,"comments":0,"entities":["polars","pypi"],"frustration":0,"sourceName":"pola-rs/polars"},{"id":"github:pola-rs/polars#29883","kind":"github","source":"gh:pola-rs/polars","url":"https://github.com/pola-rs/polars/issues/29883","title":"Windows: access violation in bundled mimalloc 3.3.2 (`_mi_subproc` null `tld`), fixed upstream in mimalloc 3.4.1","excerpt":"...real evidence is the instruction-level match and the upstream fix. Possibly related open issues with the same Windows `0xc0000005` shape: #26617 (long-lived worker, \"needs repro\"), #23142, and #28961 (Windows CI access violations, handled by skipping tests). **Ask:** pick up a...","author":"ANDADAC","day":"2026-10-12","score":0,"comments":0,"entities":["polars","streamlit","pypi"],"frustration":0,"sourceName":"pola-rs/polars"},{"id":"github:pola-rs/polars#29835","kind":"github","source":"gh:pola-rs/polars","url":"https://github.com/pola-rs/polars/issues/29835","title":"Inconsistent handling of string arguments: literals as `pl.lit` vs. column names as `pl.col`","excerpt":"### Description In different functions, string arguments are interpreted differently: in some cases, the string is perceived as a string literal, in others - as a column name This creates confusion and leads to non‑obvious behavior E.g.: However, fixing this would result in the...","author":"PelinV","day":"2026-10-09","score":0,"comments":1,"entities":["polars"],"frustration":0,"sourceName":"pola-rs/polars"},{"id":"github:pola-rs/polars#29762","kind":"github","source":"gh:pola-rs/polars","url":"https://github.com/pola-rs/polars/issues/29762","title":"Regression in 2.0.0: inequality join on decimals of different scale fails (search_sorted not supported for decimal[38,2] and decimal[38,12]), breaks TPC-H Q11","excerpt":"### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the latest version of Polars. ### Reproducible example ### Log output ### Issue description This is the shape of TPC-H Q11 (`HAVING value > SUM(...) * (0.0001...","author":"djouallah","day":"2026-10-06","score":1,"comments":0,"entities":["polars","github","pypi"],"frustration":0,"sourceName":"pola-rs/polars"},{"id":"github:pola-rs/polars#29765","kind":"github","source":"gh:pola-rs/polars","url":"https://github.com/pola-rs/polars/issues/29765","title":"Performance regression in 2.0.0","excerpt":"### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars. ### Reproducible example n/a (see below) ### Issue description I have two real-world scripts...","author":"gdementen","day":"2026-10-06","score":0,"comments":1,"entities":["polars","pypi"],"frustration":0,"sourceName":"pola-rs/polars"},{"id":"github:pola-rs/polars#29707","kind":"github","source":"gh:pola-rs/polars","url":"https://github.com/pola-rs/polars/issues/29707","title":"Nested caches drop projection, giving wrong results (regression in 1.43.0)","excerpt":"### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the latest version of Polars. ### Reproducible example ### Log output ### Issue description When caches are nested, the projection between the two caches is...","author":"kdn36","day":"2026-10-02","score":0,"comments":0,"entities":["polars"],"frustration":0,"sourceName":"pola-rs/polars"},{"id":"github:pola-rs/polars#29667","kind":"github","source":"gh:pola-rs/polars","url":"https://github.com/pola-rs/polars/issues/29667","title":"Common subplan elimination panics with reused derived LazyFrame and aggregate filter","excerpt":"...and then left-joins the latest snapshot of the source (`filter(col == col.max())`). Workaround: express the max filter as a semi join, e.g. `lf.join(lf.select(pl.col(\"v\").max()), on=\"v\", how=\"semi\")`. ### Expected behavior The query collects without panicking and returns the...","author":"MatthiasRoels","day":"2026-10-01","score":0,"comments":3,"entities":["polars","pypi"],"frustration":0,"sourceName":"pola-rs/polars"},{"id":"github:pola-rs/polars#29253","kind":"github","source":"gh:pola-rs/polars","url":"https://github.com/pola-rs/polars/issues/29253","title":"`read_database` silently ignores `schema_overrides` for Arrow-based drivers","excerpt":"### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars. ### Reproducible example ### Log output ### Issue description `schema_overrides` is silently...","author":"MariusMerkleQC","day":"2026-09-10","score":2,"comments":1,"entities":["polars","pypi"],"frustration":0,"sourceName":"pola-rs/polars"},{"id":"github:pola-rs/polars#29255","kind":"github","source":"gh:pola-rs/polars","url":"https://github.com/pola-rs/polars/issues/29255","title":"Performance regression in `pl.all().fill_nan(None)`","excerpt":"### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars. ### Reproducible example ### Log output ### Issue description It seems there is a regression...","author":"fsimkovic","day":"2026-09-10","score":1,"comments":5,"entities":["polars","pypi"],"frustration":0,"sourceName":"pola-rs/polars"},{"id":"github:pola-rs/polars#29123","kind":"github","source":"gh:pola-rs/polars","url":"https://github.com/pola-rs/polars/issues/29123","title":"`Map` dtype followups","excerpt":"In https://github.com/pola-rs/polars/pull/28984 we added basic support for the `Map` dtype, but we left a couple of follow-ups that should be done after the initial PR is merged.","author":"dancsi","day":"2026-09-03","score":1,"comments":0,"entities":["polars","github"],"frustration":0,"sourceName":"pola-rs/polars"}],"related":[{"id":"github-breaking-changes","statement":"GitHub upgrades break working setups","category":"reliability","issue":"breaking-changes","entity":"github","entityName":"GitHub","domain":"github.com","method":"pattern","posts":87,"authors":75,"places":20,"engagement":102,"last7":10,"prev7":20,"momentum":"fading","daysActive":35,"severity":0,"firstPost":"2026-08-27","lastPost":"2026-11-06","firstSeen":"2026-09-25 12:39:59","companies":[{"slug":"github","name":"GitHub","domain":"github.com","n":87},{"slug":"vercel","name":"Vercel","domain":"vercel.com","n":36},{"slug":"npm","name":"npm","domain":"npmjs.com","n":23},{"slug":"kubernetes","name":"Kubernetes","domain":"kubernetes.io","n":12},{"slug":"grafana","name":"Grafana","domain":"grafana.com","n":8},{"slug":"docker","name":"Docker","domain":"docker.com","n":7}],"kinds":["github","hn","stackoverflow"],"spark":[1,5,2,2,2,0,0,0,1,0,6,4,1,0,1,2,2,0,4,7,2,0,5,6,3,0,1,0,0,0],"top":[{"url":"https://github.com/CodeWithCJ/SparkyFitness/issues/3289","title":"[Bug]: Migration error 23505 and P0001 in v1.10.0","kind":"github","source":"CodeWithCJ/SparkyFitness","author":"brflan909","day":"2026-10-30","score":0},{"url":"https://github.com/kubernetes/kubernetes/issues/142293","title":"Kubelet emits spurious Pod status updates due to nondeterministic allocated resource health ordering","kind":"github","source":"kubernetes/kubernetes","author":"photoszzt","day":"2026-09-21","score":1},{"url":"https://github.com/kubernetes/kubernetes/issues/143731","title":"portforward improperly closes local listener in response to server workload RST, breaking all subsequent connections","kind":"github","source":"kubernetes/kubernetes","author":"ringerc","day":"2026-11-03","score":0}],"verified":true,"rising":-0.1,"persistent":true,"opportunity":"87 posts from 75 people in 20 places, about 8 a week over 72 days. Mostly on vercel/next.js, kubernetes/kubernetes, grafana/grafana. Tools named alongside: Vercel, npm, Kubernetes, Grafana.","summary":"GitHub users experience workflow disruptions and breaking changes including command argument updates, configuration generation errors, and Kubelet pod status sync issues.","summaryBy":"model"},{"id":"breaking-changes","statement":"Upgrades and new releases break working setups","category":"reliability","issue":"breaking-changes","entity":"","entityName":"","domain":"","method":"pattern","posts":76,"authors":62,"places":35,"engagement":38,"last7":14,"prev7":12,"momentum":"steady","daysActive":42,"severity":0,"firstPost":"2026-08-29","lastPost":"2026-11-08","firstSeen":"2026-09-25 12:39:59","companies":[{"slug":"github","name":"GitHub","domain":"github.com","n":10},{"slug":"apache-airflow","name":"Apache Airflow","domain":"airflow.apache.org","n":3},{"slug":"docker","name":"Docker","domain":"docker.com","n":3},{"slug":"observe","name":"Observe","domain":"observeinc.com","n":3},{"slug":"dbt","name":"dbt","domain":"getdbt.com","n":3},{"slug":"cloudflare","name":"Cloudflare","domain":"cloudflare.com","n":2}],"kinds":["github","reddit","appstore","discourse"],"spark":[2,1,2,1,1,2,1,0,1,1,1,1,2,1,0,0,0,1,1,3,2,2,3,8,1,2,0,2,1,0],"top":[{"url":"https://github.com/n8n-io/n8n/issues/40847","title":"Publication trigger status: \"value too long for type character varying(36)\" retry loop when active workflows have node ids longer than 36 ch","kind":"github","source":"n8n-io/n8n","author":"miqueasmd","day":"2026-10-11","score":0},{"url":"https://github.com/fosrl/pangolin/issues/4070","title":"Intermittent 403 After Upgrading to 1.26.0","kind":"github","source":"fosrl/pangolin","author":"akehir","day":"2026-11-08","score":0},{"url":"https://github.com/ollama/ollama/issues/18831","title":"Regression“ und „since 0.35","kind":"github","source":"ollama/ollama","author":"unixtom","day":"2026-10-07","score":0}],"verified":true,"rising":16,"persistent":true,"opportunity":"76 posts from 62 people in 35 places, about 7 a week over 72 days. Mostly on crewAIInc/crewAI, BerriAI/litellm, r/sysadmin. Tools named alongside: GitHub, Apache Airflow, Docker, Observe.","summary":"Software developers and system users experience missing library linking errors, broken terminal scrolling, model loading failures, and system boot issues involving TPM.","summaryBy":"model"},{"id":"claude-code-breaking-changes","statement":"Claude Code upgrades break working setups","category":"reliability","issue":"breaking-changes","entity":"claude-code","entityName":"Claude Code","domain":"anthropic.com","method":"pattern","posts":67,"authors":60,"places":18,"engagement":591,"last7":3,"prev7":8,"momentum":"fading","daysActive":37,"severity":0,"firstPost":"2026-08-27","lastPost":"2026-11-05","firstSeen":"2026-09-25 12:39:59","companies":[{"slug":"claude-code","name":"Claude Code","domain":"anthropic.com","n":67},{"slug":"claude","name":"Claude","domain":"anthropic.com","n":41},{"slug":"github","name":"GitHub","domain":"github.com","n":27},{"slug":"apache-airflow","name":"Apache Airflow","domain":"airflow.apache.org","n":8},{"slug":"shell","name":"Shell","domain":"shell.com","n":8},{"slug":"openai-codex","name":"Codex","domain":"openai.com","n":3}],"kinds":["github","hn","reddit"],"spark":[0,0,0,1,3,8,2,1,2,1,1,0,2,2,2,5,3,0,0,1,2,1,1,0,2,1,0,0,0,0],"top":[{"url":"https://github.com/anthropics/claude-code/issues/92984","title":"[BUG] Cowork (Windows): all Plan9 shares fail with \"Plan9 mount failed: invalid argument\" after Windows update KB5124008 (26200.9445) — unin","kind":"github","source":"anthropics/claude-code","author":"tomokuri8","day":"2026-09-09","score":61},{"url":"https://github.com/anthropics/claude-code/issues/92958","title":"[BUG] Cowork Windows: September 2026 cumulative update breaks Plan9 share attach — device_bash dead on both ARM64 (KB5124012 / 28000.2954) a","kind":"github","source":"anthropics/claude-code","author":"tedwuted-oss","day":"2026-09-09","score":11},{"url":"https://github.com/anthropics/claude-code/issues/92099","title":"[BUG] Claude Code Desktop on windows errors when updating","kind":"github","source":"anthropics/claude-code","author":"jonvanausdeln","day":"2026-09-04","score":19}],"verified":true,"rising":-2,"persistent":true,"opportunity":"67 posts from 60 people in 18 places, about 6 a week over 71 days. Mostly on anthropics/claude-code, apache/airflow, crewAIInc/crewAI. Tools named alongside: Claude, GitHub, Apache Airflow, Shell.","summary":"Claude Code users face permission mode issues and broken guest VM shells that prevent them from accessing or diagnosing system errors.","summaryBy":"model"},{"id":"openai-codex-breaking-changes","statement":"Codex upgrades break working setups","category":"reliability","issue":"breaking-changes","entity":"openai-codex","entityName":"Codex","domain":"openai.com","method":"pattern","posts":65,"authors":58,"places":18,"engagement":842,"last7":11,"prev7":7,"momentum":"rising","daysActive":33,"severity":1,"firstPost":"2026-09-02","lastPost":"2026-11-08","firstSeen":"2026-09-25 12:39:59","companies":[{"slug":"openai-codex","name":"Codex","domain":"openai.com","n":65},{"slug":"github","name":"GitHub","domain":"github.com","n":17},{"slug":"chatgpt","name":"ChatGPT","domain":"openai.com","n":11},{"slug":"vscode","name":"VS Code","domain":"microsoft.com","n":7},{"slug":"npm","name":"npm","domain":"npmjs.com","n":5},{"slug":"llamaindex","name":"LlamaIndex","domain":"llamaindex.ai","n":4}],"kinds":["github","reddit"],"spark":[0,0,2,1,3,1,0,1,0,1,2,1,2,2,6,1,1,4,0,0,0,2,0,1,2,1,5,1,1,0],"top":[{"url":"https://github.com/openai/codex/issues/55744","title":"macOS app 26.1016.51333: new chats fail on first message with Cannot serialize value (couldn't stringify value)","kind":"github","source":"openai/codex","author":"ZhangLiangchen","day":"2026-10-21","score":163},{"url":"https://github.com/openai/codex/issues/52407","title":"Windows Dots: CUA MXC launcher fails with HRESULT 0x80070003 after direct shell recovery","kind":"github","source":"openai/codex","author":"mrnguyenlk-byte","day":"2026-10-09","score":10},{"url":"https://github.com/openai/codex/issues/49988","title":"Code extension intermittently drops submitted messages after update.","kind":"github","source":"openai/codex","author":"jorgeCabreraSanchez","day":"2026-10-01","score":48}],"verified":true,"rising":24.7,"persistent":true,"opportunity":"65 posts from 58 people in 18 places, about 7 a week over 68 days. Mostly on openai/codex, crewAIInc/crewAI, run-llama/llama_index. Tools named alongside: GitHub, ChatGPT, VS Code, npm.","summary":"Codex users experience updates that fail to start chats, clear input without sending messages, hijack keyboard shortcuts, and randomly stall message processing.","summaryBy":"model"},{"id":"duckdb-breaking-changes","statement":"DuckDB upgrades break working setups","category":"reliability","issue":"breaking-changes","entity":"duckdb","entityName":"DuckDB","domain":"duckdb.org","method":"pattern","posts":37,"authors":28,"places":3,"engagement":19,"last7":0,"prev7":11,"momentum":"fading","daysActive":20,"severity":0,"firstPost":"2026-09-17","lastPost":"2026-11-02","firstSeen":"2026-09-25 12:50:30","companies":[{"slug":"duckdb","name":"DuckDB","domain":"duckdb.org","n":37},{"slug":"github","name":"GitHub","domain":"github.com","n":8},{"slug":"docker","name":"Docker","domain":"docker.com","n":3},{"slug":"pypi","name":"PyPI","domain":"pypi.org","n":2},{"slug":"aws","name":"AWS","domain":"aws.amazon.com","n":2},{"slug":"sql-server","name":"SQL Server","domain":"microsoft.com","n":1}],"kinds":["github"],"spark":[1,1,0,3,0,0,0,1,2,2,2,4,0,0,0,0,4,0,2,4,0,0,1,0,0,0,0,0,0,0],"top":[{"url":"https://github.com/duckdb/duckdb/issues/27574","title":"Performance regression from 1.5.6 to 2.0: about 2x per-statement overhead (prepare and execute)","kind":"github","source":"duckdb/duckdb","author":"skuirrels","day":"2026-10-20","score":1},{"url":"https://github.com/duckdb/duckdb/issues/27646","title":"CREATE VIEW rejects fully qualified `db.db.t` as ambiguous when the view is in `db` (2.0.0 regression)","kind":"github","source":"duckdb/duckdb","author":"chriscoey","day":"2026-10-21","score":0},{"url":"https://github.com/duckdb/duckdb/issues/25857","title":"Parquet reader truncates INT96 timestamps to microseconds; no way to read their nanosecond part","kind":"github","source":"duckdb/duckdb","author":"kliszaq","day":"2026-09-17","score":0}],"verified":true,"rising":0,"persistent":false,"opportunity":"37 posts from 28 people in 3 places, about 5 a week over 47 days. Mostly on duckdb/duckdb, dbt-labs/dbt, apache/airflow. Tools named alongside: GitHub, Docker, PyPI, AWS.","summary":"DuckDB users experience performance slowdowns, crashes, corrupted WAL replays, unreadable compressed strings, and silently altered data values after updates or specific operations.","summaryBy":"model"},{"id":"claude-breaking-changes","statement":"Claude upgrades break working setups","category":"reliability","issue":"breaking-changes","entity":"claude","entityName":"Claude","domain":"anthropic.com","method":"pattern","posts":35,"authors":34,"places":17,"engagement":546,"last7":6,"prev7":2,"momentum":"rising","daysActive":29,"severity":1,"firstPost":"2026-09-02","lastPost":"2026-11-05","firstSeen":"2026-09-25 12:39:59","companies":[{"slug":"claude","name":"Claude","domain":"anthropic.com","n":35},{"slug":"github","name":"GitHub","domain":"github.com","n":14},{"slug":"claude-code","name":"Claude Code","domain":"anthropic.com","n":14},{"slug":"pytorch","name":"PyTorch","domain":"pytorch.org","n":4},{"slug":"llamaindex","name":"LlamaIndex","domain":"llamaindex.ai","n":2},{"slug":"pypi","name":"PyPI","domain":"pypi.org","n":2}],"kinds":["github","reddit","hn"],"spark":[0,1,1,1,1,1,1,3,0,0,0,0,0,0,1,1,1,0,1,0,0,0,0,2,2,2,0,0,0,0],"top":[{"url":"https://github.com/anthropics/claude-code/issues/91870","title":"Mods - make Claude 10x more extensible","kind":"github","source":"anthropics/claude-code","author":"poteat","day":"2026-09-03","score":205},{"url":"https://github.com/anthropics/claude-code/issues/95326","title":"[BUG] [Claude in Chrome] All tools blocked on reddit.com (and redd.it) with \"not allowed due to safety restrictions\" since 2026-09-18 — wor","kind":"github","source":"anthropics/claude-code","author":"rackpathlabs-ops","day":"2026-09-18","score":17},{"url":"https://github.com/anthropics/claude-code/issues/98159","title":"[FEATURE] claude.ai: let users set a default permission mode, incl. \"Skip all approvals\"","kind":"github","source":"anthropics/claude-code","author":"brianaicoding","day":"2026-09-29","score":9}],"verified":true,"rising":13.3,"persistent":true,"opportunity":"35 posts from 34 people in 17 places, about 4 a week over 65 days. Mostly on anthropics/claude-code, pytorch/pytorch, run-llama/llama_index. Tools named alongside: GitHub, Claude Code, PyTorch, LlamaIndex.","summary":"","summaryBy":""},{"id":"clickhouse-breaking-changes","statement":"ClickHouse upgrades break working setups","category":"reliability","issue":"breaking-changes","entity":"clickhouse","entityName":"ClickHouse","domain":"clickhouse.com","method":"pattern","posts":31,"authors":20,"places":3,"engagement":34,"last7":7,"prev7":3,"momentum":"rising","daysActive":19,"severity":0,"firstPost":"2026-09-21","lastPost":"2026-11-04","firstSeen":"2026-09-27 05:42:20","companies":[{"slug":"clickhouse","name":"ClickHouse","domain":"clickhouse.com","n":31},{"slug":"github","name":"GitHub","domain":"github.com","n":20},{"slug":"text","name":"Text","domain":"investor.text.com","n":1},{"slug":"langfuse","name":"Langfuse","domain":"langfuse.com","n":1},{"slug":"kubernetes","name":"Kubernetes","domain":"kubernetes.io","n":1},{"slug":"apache-superset","name":"Apache Superset","domain":"superset.apache.org","n":1}],"kinds":["github"],"spark":[0,0,1,2,3,1,0,0,0,0,0,1,0,0,0,1,2,0,0,0,0,0,1,5,2,0,0,0,0,0],"top":[{"url":"https://github.com/ClickHouse/ClickHouse/issues/126264","title":"RFC: Compression codecs for subcolumns","kind":"github","source":"ClickHouse/ClickHouse","author":"vitlibar","day":"2026-10-16","score":1},{"url":"https://github.com/ClickHouse/ClickHouse/issues/121509","title":"Reuse checksum-matching detached parts when bootstrapping a fresh replica","kind":"github","source":"ClickHouse/ClickHouse","author":"patelsmit32123","day":"2026-09-22","score":1},{"url":"https://github.com/ClickHouse/ClickHouse/issues/128592","title":"Wide parts with a `Geometry` column written before 26.8 are unreadable after the upgrade: `Stream g.MultiPoint.size0 ... is not found`","kind":"github","source":"ClickHouse/ClickHouse","author":"fm4v","day":"2026-11-02","score":0}],"verified":true,"rising":11.8,"persistent":true,"opportunity":"31 posts from 20 people in 3 places, about 4 a week over 45 days. Mostly on ClickHouse/ClickHouse, BerriAI/litellm, apache/superset. Tools named alongside: GitHub, Text, Langfuse, Kubernetes.","summary":"ClickHouse users face performance issues and unexpected behavior with array comparisons, default ZSTD compression, table codecs, and Iceberg delete files.","summaryBy":"model"},{"id":"anthropic-breaking-changes","statement":"Anthropic upgrades break working setups","category":"reliability","issue":"breaking-changes","entity":"anthropic","entityName":"Anthropic","domain":"anthropic.com","method":"pattern","posts":27,"authors":22,"places":4,"engagement":69,"last7":1,"prev7":1,"momentum":"steady","daysActive":21,"severity":0,"firstPost":"2026-09-03","lastPost":"2026-11-05","firstSeen":"2026-09-25 12:39:59","companies":[{"slug":"anthropic","name":"Anthropic","domain":"anthropic.com","n":27},{"slug":"openai","name":"OpenAI","domain":"openai.com","n":25},{"slug":"ollama","name":"Ollama","domain":"ollama.com","n":23},{"slug":"langchain","name":"LangChain","domain":"langchain.com","n":22},{"slug":"perplexity","name":"Perplexity","domain":"perplexity.ai","n":21},{"slug":"deepseek","name":"DeepSeek","domain":"deepseek.com","n":21}],"kinds":["github"],"spark":[0,0,0,1,1,1,1,0,0,0,0,0,0,2,1,2,0,1,0,0,0,0,0,0,0,1,0,0,0,0],"top":[{"url":"https://github.com/langchain-ai/langchain/issues/40745","title":"core: empty `group_ids` bypasses validation and filtering in `InMemoryRecordManager`","kind":"github","source":"langchain-ai/langchain","author":"Nikhi00718","day":"2026-09-22","score":0},{"url":"https://github.com/langchain-ai/langchain/issues/40444","title":"Token budget middleware that checks in with the user instead of hard-stopping","kind":"github","source":"langchain-ai/langchain","author":"sauravsolanki","day":"2026-09-14","score":1},{"url":"https://github.com/langchain-ai/langchain/issues/41138","title":"merge_message_runs raises for ChatMessage roles and FunctionMessage names that differ","kind":"github","source":"langchain-ai/langchain","author":"Mohit-25-tech","day":"2026-10-07","score":0}],"verified":true,"rising":0,"persistent":true,"opportunity":"27 posts from 22 people in 4 places, about 3 a week over 64 days. Mostly on langchain-ai/langchain, BerriAI/litellm, ollama/ollama. Tools named alongside: OpenAI, Ollama, LangChain, Perplexity.","summary":"Anthropic users encounter bugs where tool execution budget controls fail and LangChain integration errors occur across multiple submissions.","summaryBy":"model"},{"id":"pytorch-breaking-changes","statement":"PyTorch upgrades break working setups","category":"reliability","issue":"breaking-changes","entity":"pytorch","entityName":"PyTorch","domain":"pytorch.org","method":"pattern","posts":26,"authors":21,"places":4,"engagement":43,"last7":5,"prev7":1,"momentum":"rising","daysActive":14,"severity":0,"firstPost":"2026-09-03","lastPost":"2026-11-07","firstSeen":"2026-09-25 12:39:59","companies":[{"slug":"pytorch","name":"PyTorch","domain":"pytorch.org","n":26},{"slug":"hugging-face","name":"Hugging Face","domain":"huggingface.co","n":12},{"slug":"github","name":"GitHub","domain":"github.com","n":7},{"slug":"nvidia","name":"NVIDIA","domain":"nvidia.com","n":6},{"slug":"pypi","name":"PyPI","domain":"pypi.org","n":1},{"slug":"aws","name":"AWS","domain":"aws.amazon.com","n":1}],"kinds":["github","reddit"],"spark":[0,0,0,0,0,0,2,0,0,0,0,0,5,0,2,0,0,0,0,0,0,1,0,1,0,0,2,2,0,0],"top":[{"url":"https://github.com/huggingface/transformers/issues/50224","title":"`_attn_implementation` setter does not reach encoder/decoder stacks built with `copy.deepcopy(config)`","kind":"github","source":"huggingface/transformers","author":"the-cross-art","day":"2026-11-01","score":0},{"url":"https://github.com/huggingface/transformers/issues/49902","title":"GOT-OCR2 produces incorrect bounding-box coordinates for NumPy images","kind":"github","source":"huggingface/transformers","author":"BlazeSR10hawk","day":"2026-10-23","score":0},{"url":"https://github.com/huggingface/transformers/issues/48972","title":"`save_pretrained(state_dict=...)` can duplicate tied weights after state-dict materialization","kind":"github","source":"huggingface/transformers","author":"UnitedSnakes","day":"2026-09-21","score":0}],"verified":true,"rising":9.3,"persistent":true,"opportunity":"26 posts from 21 people in 4 places, about 3 a week over 66 days. Mostly on huggingface/transformers, pytorch/pytorch, r/MachineLearning. Tools named alongside: Hugging Face, GitHub, NVIDIA, PyPI.","summary":"","summaryBy":""},{"id":"chatgpt-breaking-changes","statement":"ChatGPT upgrades break working setups","category":"reliability","issue":"breaking-changes","entity":"chatgpt","entityName":"ChatGPT","domain":"openai.com","method":"pattern","posts":26,"authors":26,"places":6,"engagement":415,"last7":3,"prev7":2,"momentum":"steady","daysActive":19,"severity":0,"firstPost":"2026-08-29","lastPost":"2026-11-05","firstSeen":"2026-09-25 12:39:59","companies":[{"slug":"chatgpt","name":"ChatGPT","domain":"openai.com","n":26},{"slug":"openai-codex","name":"Codex","domain":"openai.com","n":20},{"slug":"mcp","name":"Model Context Protocol","domain":"modelcontextprotocol.io","n":4},{"slug":"github","name":"GitHub","domain":"github.com","n":4},{"slug":"observe","name":"Observe","domain":"observeinc.com","n":4},{"slug":"continue","name":"Continue","domain":"continue.dev","n":2}],"kinds":["github","discourse","appstore"],"spark":[0,0,0,0,0,1,0,0,1,0,1,0,1,0,0,1,1,1,0,0,0,0,0,2,0,1,0,0,0,0],"top":[{"url":"https://github.com/openai/codex/issues/41463","title":"[Windows + WSL] Cannot create projects – AbsolutePathBuf deserialized without a base path","kind":"github","source":"openai/codex","author":"GeorgeValle","day":"2026-08-29","score":34},{"url":"https://github.com/openai/codex/issues/47345","title":"Bug: Linux sandbox fails with mountinfo path is not absolute after ChatGPT update","kind":"github","source":"openai/codex","author":"JamiA97","day":"2026-09-22","score":28},{"url":"https://github.com/openai/codex/issues/51932","title":"Windows App 26.1002.7124.0: sandbox runtime read/execute validation fails with sharing violation","kind":"github","source":"openai/codex","author":"matsuokajuri","day":"2026-10-08","score":2}],"verified":true,"rising":4.6,"persistent":true,"opportunity":"26 posts from 26 people in 6 places, about 3 a week over 69 days. Mostly on openai/codex, BerriAI/litellm, n8n-io/n8n. Tools named alongside: Codex, Model Context Protocol, GitHub, Observe.","summary":"","summaryBy":""},{"id":"openai-breaking-changes","statement":"OpenAI upgrades break working setups","category":"reliability","issue":"breaking-changes","entity":"openai","entityName":"OpenAI","domain":"openai.com","method":"pattern","posts":25,"authors":25,"places":11,"engagement":60,"last7":1,"prev7":2,"momentum":"steady","daysActive":20,"severity":1,"firstPost":"2026-09-21","lastPost":"2026-11-05","firstSeen":"2026-09-26 18:17:59","companies":[{"slug":"openai","name":"OpenAI","domain":"openai.com","n":25},{"slug":"vllm","name":"vLLM","domain":"vllm.ai","n":8},{"slug":"github","name":"GitHub","domain":"github.com","n":7},{"slug":"nvidia","name":"NVIDIA","domain":"nvidia.com","n":5},{"slug":"docker","name":"Docker","domain":"docker.com","n":5},{"slug":"mlflow","name":"MLflow","domain":"mlflow.org","n":4}],"kinds":["github","reddit","discourse"],"spark":[0,1,0,1,1,0,0,1,0,0,1,1,2,1,1,1,0,0,0,1,0,0,1,0,0,1,0,0,0,0],"top":[{"url":"https://github.com/vllm-project/vllm/issues/63505","title":"[Bug]: Qwen3.8-27B (GDN hybrid) with PP=3 on sm_86: illegal memory access (Xid 31) with prefix caching, gibberish output without it; regress","kind":"github","source":"vllm-project/vllm","author":"levaitamas","day":"2026-10-24","score":0},{"url":"https://github.com/open-webui/open-webui/issues/32311","title":"feat: realtime calls should start speaking a hand-off's answer while the chat model is still writing it","kind":"github","source":"open-webui/open-webui","author":"catapultcase","day":"2026-10-12","score":0},{"url":"https://github.com/vllm-project/vllm/issues/59724","title":"[Bug][SM120] MTP speculative decoding acceptance rate drops to 0% on nightly with native FLASHINFER_MLA_SPARSE_SM120 backend (GLM-5.3-Flash)","kind":"github","source":"vllm-project/vllm","author":"Lei-010","day":"2026-10-02","score":0}],"verified":true,"rising":0,"persistent":true,"opportunity":"25 posts from 25 people in 11 places, about 4 a week over 46 days. Mostly on vllm-project/vllm, open-webui/open-webui, mlflow/mlflow. Tools named alongside: vLLM, GitHub, NVIDIA, Docker.","summary":"","summaryBy":""},{"id":"open-webui-breaking-changes","statement":"Open WebUI upgrades break working setups","category":"reliability","issue":"breaking-changes","entity":"open-webui","entityName":"Open WebUI","domain":"openwebui.com","method":"pattern","posts":25,"authors":2,"places":1,"engagement":37,"last7":0,"prev7":0,"momentum":"fading","daysActive":4,"severity":0,"firstPost":"2026-10-03","lastPost":"2026-10-16","firstSeen":"2026-10-09 05:27:06","companies":[{"slug":"open-webui","name":"Open WebUI","domain":"openwebui.com","n":25}],"kinds":["github"],"spark":[0,0,0,0,0,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"top":[{"url":"https://github.com/open-webui/open-webui/issues/32525","title":"issue: [regression] [dev] folder page never shows its chats","kind":"github","source":"open-webui/open-webui","author":"Classic298","day":"2026-10-16","score":0},{"url":"https://github.com/open-webui/open-webui/issues/32527","title":"issue: [regression] [dev] someone removed from the group keeps a chat shared with \"Allow replies\" open again","kind":"github","source":"open-webui/open-webui","author":"Classic298","day":"2026-10-16","score":0},{"url":"https://github.com/open-webui/open-webui/issues/31886","title":"feat: Allow status events to render below assistant content","kind":"github","source":"open-webui/open-webui","author":"trigger2k20","day":"2026-10-03","score":0}],"verified":true,"rising":0,"persistent":false,"opportunity":"25 posts from 2 people in 1 place, about 13 a week over 14 days. Mostly on open-webui/open-webui.","summary":"","summaryBy":""}],"sameEntity":[{"id":"polars-issues","statement":"Polars users keep filing bugs","category":"data-engineering","issue":"general","entity":"polars","entityName":"Polars","domain":"pola.rs","method":"entity","posts":22,"authors":15,"places":1,"engagement":19,"last7":0,"prev7":6,"momentum":"fading","daysActive":13,"severity":0,"firstPost":"2026-08-27","lastPost":"2026-10-28","firstSeen":"2026-09-25 12:50:30","companies":[{"slug":"polars","name":"Polars","domain":"pola.rs","n":22},{"slug":"pypi","name":"PyPI","domain":"pypi.org","n":13},{"slug":"github","name":"GitHub","domain":"github.com","n":5},{"slug":"kubernetes","name":"Kubernetes","domain":"kubernetes.io","n":1},{"slug":"docker","name":"Docker","domain":"docker.com","n":1},{"slug":"temporal","name":"Temporal","domain":"temporal.io","n":1}],"kinds":["github"],"spark":[3,0,0,1,0,0,0,0,0,2,2,0,1,0,0,0,2,4,0,0,0,0,0,0,0,0,0,0,0,0],"top":[{"url":"https://github.com/pola-rs/polars/issues/30334","title":"Consider upgrading the brotli crate (CVE-2026-111497)","kind":"github","source":"pola-rs/polars","author":"sugibuchi","day":"2026-10-27","score":0},{"url":"https://github.com/pola-rs/polars/issues/30338","title":"Inaccurate description for `serde-lazy` feature","kind":"github","source":"pola-rs/polars","author":"ezzedin-ahmed","day":"2026-10-27","score":0},{"url":"https://github.com/pola-rs/polars/issues/29846","title":"Performance discrepancy for `df.filter(...)`","kind":"github","source":"pola-rs/polars","author":"fsimkovic","day":"2026-10-09","score":1}],"verified":true,"rising":0,"persistent":false,"opportunity":"22 posts from 15 people in 1 place, about 2 a week over 63 days. Mostly on pola-rs/polars. Tools named alongside: PyPI, GitHub, Kubernetes, Docker.","summary":"Polars users experience missing Map operations, compilation verification issues, error returns for Map expressions, and suboptimal query optimization settings.","summaryBy":"model"},{"id":"polars-kw-column","statement":"Trouble with Polars column","category":"data-engineering","issue":"kw:column","entity":"polars","entityName":"Polars","domain":"pola.rs","method":"keyword","posts":20,"authors":16,"places":3,"engagement":22,"last7":1,"prev7":8,"momentum":"fading","daysActive":16,"severity":0,"firstPost":"2026-08-30","lastPost":"2026-11-03","firstSeen":"2026-09-25 12:50:30","companies":[{"slug":"polars","name":"Polars","domain":"pola.rs","n":20},{"slug":"pypi","name":"PyPI","domain":"pypi.org","n":13},{"slug":"github","name":"GitHub","domain":"github.com","n":3},{"slug":"duckdb","name":"DuckDB","domain":"duckdb.org","n":2},{"slug":"postgresql","name":"PostgreSQL","domain":"postgresql.org","n":2},{"slug":"sqlite","name":"SQLite","domain":"sqlite.org","n":1}],"kinds":["github","stackoverflow"],"spark":[0,1,0,0,0,0,0,0,1,1,2,1,0,0,0,0,2,2,1,1,0,0,2,1,0,0,0,0,0,0],"top":[{"url":"https://stackoverflow.com/questions/80014247/compare-lists-in-one-column-to-the-first-n-elements-of-another-column-in-python","title":"Compare lists in one column to the first n elements of another column in Python Polars lazyframes, where n is dynamically determined from in","kind":"stackoverflow","source":"Stack Overflow [python-polars]","author":"qtamo","day":"2026-11-02","score":4},{"url":"https://github.com/pola-rs/polars/issues/30329","title":"Lazy join returns wrong data when a suffixed column (id_right) has the same name as the right join key","kind":"github","source":"pola-rs/polars","author":"gautamvarmadatla","day":"2026-10-27","score":1},{"url":"https://github.com/pola-rs/polars/issues/30173","title":"pivot: peak memory grows ~1 byte per row per output column (4 GB for a 50 x 2000 pivot of a 180 MB frame)","kind":"github","source":"pola-rs/polars","author":"jqnatividad","day":"2026-10-21","score":0}],"verified":true,"rising":0,"persistent":true,"opportunity":"20 posts from 16 people in 3 places, about 2 a week over 66 days. Mostly on pola-rs/polars, unionai-oss/pandera, Stack Overflow [python-polars]. Tools named alongside: PyPI, GitHub, DuckDB, PostgreSQL.","summary":"Polars users experience inconsistent list behaviors, errors with column values, and metadata pruning issues.","summaryBy":"model"},{"id":"polars-kw-parquet","statement":"Trouble with Polars parquet","category":"data-engineering","issue":"kw:parquet","entity":"polars","entityName":"Polars","domain":"pola.rs","method":"keyword","posts":7,"authors":7,"places":1,"engagement":8,"last7":0,"prev7":0,"momentum":"fading","daysActive":6,"severity":0,"firstPost":"2026-09-03","lastPost":"2026-10-18","firstSeen":"2026-09-25 12:50:30","companies":[{"slug":"polars","name":"Polars","domain":"pola.rs","n":7},{"slug":"pypi","name":"PyPI","domain":"pypi.org","n":6}],"kinds":["github"],"spark":[0,0,1,0,0,0,0,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"top":[{"url":"https://github.com/pola-rs/polars/issues/29921","title":"perf: `is_in` with more than 100 values does not skip Parquet row groups between the values","kind":"github","source":"pola-rs/polars","author":"ndaskalovic","day":"2026-10-13","score":3},{"url":"https://github.com/pola-rs/polars/issues/29136","title":"Custom `pyarrow_options` in `write_parquet` are overwritten by default function args","kind":"github","source":"pola-rs/polars","author":"robertop-intern","day":"2026-09-03","score":1},{"url":"https://github.com/pola-rs/polars/issues/30043","title":"Parquet writer merges UInt64/UInt32 page statistics with a signed comparison (row-group min > max), so `scan_parquet` filters drop matching ","kind":"github","source":"pola-rs/polars","author":"hanke580","day":"2026-10-18","score":1}],"verified":true,"rising":0,"persistent":false,"opportunity":"7 posts from 7 people in 1 place, about 1 a week over 46 days. Mostly on pola-rs/polars. Tools named alongside: PyPI.","summary":"","summaryBy":""},{"id":"polars-kw-unique","statement":"Trouble with Polars unique","category":"data-engineering","issue":"kw:unique","entity":"polars","entityName":"Polars","domain":"pola.rs","method":"keyword","posts":7,"authors":4,"places":1,"engagement":6,"last7":0,"prev7":5,"momentum":"fading","daysActive":4,"severity":0,"firstPost":"2026-10-12","lastPost":"2026-10-29","firstSeen":"2026-11-02 05:27:11","companies":[{"slug":"polars","name":"Polars","domain":"pola.rs","n":7},{"slug":"pypi","name":"PyPI","domain":"pypi.org","n":7}],"kinds":["github"],"spark":[0,1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,3,2,0,0,0,0,0,0,0,0,0,0,0],"top":[{"url":"https://github.com/pola-rs/polars/issues/29904","title":"Streaming engine: multi-column `.unique()` in `group_by().agg()` much slower than in-memory","kind":"github","source":"pola-rs/polars","author":"gab23r","day":"2026-10-12","score":1},{"url":"https://github.com/pola-rs/polars/issues/30371","title":"Streaming `group_by`: `drop_nulls().unique()` still uses the per-column multiplexer lowering","kind":"github","source":"pola-rs/polars","author":"gab23r","day":"2026-10-28","score":1},{"url":"https://github.com/pola-rs/polars/issues/30432","title":"`sort` and `n_unique` wrong after a `rolling` `slice` with a per-window offset","kind":"github","source":"pola-rs/polars","author":"kdn36","day":"2026-10-29","score":0}],"verified":true,"rising":0,"persistent":false,"opportunity":"7 posts from 4 people in 1 place, about 2 a week over 18 days. Mostly on pola-rs/polars. Tools named alongside: PyPI.","summary":"","summaryBy":""},{"id":"polars-kw-join","statement":"Trouble with Polars join","category":"data-engineering","issue":"kw:join","entity":"polars","entityName":"Polars","domain":"pola.rs","method":"keyword","posts":6,"authors":6,"places":1,"engagement":8,"last7":0,"prev7":1,"momentum":"fading","daysActive":6,"severity":0,"firstPost":"2026-08-29","lastPost":"2026-10-30","firstSeen":"2026-09-25 12:50:30","companies":[{"slug":"polars","name":"Polars","domain":"pola.rs","n":6},{"slug":"pypi","name":"PyPI","domain":"pypi.org","n":3},{"slug":"github","name":"GitHub","domain":"github.com","n":1}],"kinds":["github"],"spark":[0,1,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0],"top":[{"url":"https://github.com/pola-rs/polars/issues/29903","title":"Coalescing full join on Int32-vs-Int64 keys with `unique` incorrect","kind":"github","source":"pola-rs/polars","author":"kdn36","day":"2026-10-12","score":1},{"url":"https://github.com/pola-rs/polars/issues/29026","title":"Left join using `join_where()` causes rayon stackoverflow","kind":"github","source":"pola-rs/polars","author":"timbeechey","day":"2026-08-29","score":1},{"url":"https://github.com/pola-rs/polars/issues/29256","title":"In streaming mode, `.limit()` doesn't return early after join operations","kind":"github","source":"pola-rs/polars","author":"cBournhonesque","day":"2026-09-10","score":2}],"verified":true,"rising":0,"persistent":false,"opportunity":"6 posts from 6 people in 1 place, about 1 a week over 63 days. Mostly on pola-rs/polars. Tools named alongside: PyPI, GitHub.","summary":"","summaryBy":""},{"id":"polars-kw-instead","statement":"Trouble with Polars instead","category":"data-engineering","issue":"kw:instead","entity":"polars","entityName":"Polars","domain":"pola.rs","method":"keyword","posts":6,"authors":6,"places":1,"engagement":10,"last7":0,"prev7":1,"momentum":"fading","daysActive":6,"severity":0,"firstPost":"2026-08-28","lastPost":"2026-10-28","firstSeen":"2026-09-25 12:50:31","companies":[{"slug":"polars","name":"Polars","domain":"pola.rs","n":6},{"slug":"pypi","name":"PyPI","domain":"pypi.org","n":5}],"kinds":["github"],"spark":[0,1,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0],"top":[{"url":"https://github.com/pola-rs/polars/issues/29881","title":"Series.to_list() panics on out-of-range datetimes instead of raising an error","kind":"github","source":"pola-rs/polars","author":"pandasuwu","day":"2026-10-12","score":2},{"url":"https://github.com/pola-rs/polars/issues/29118","title":"SQL: ORDER BY on an ungrouped QUANTILE_CONT or QUANTILE_DISC aggregate returns one row per input row instead of a single row.","kind":"github","source":"pola-rs/polars","author":"tsecon","day":"2026-09-03","score":1},{"url":"https://github.com/pola-rs/polars/issues/30045","title":"Hive partition value `k=` of a Categorical/Enum key is read back as null instead of \"\" (String keys were fixed in #24546)","kind":"github","source":"pola-rs/polars","author":"hanke580","day":"2026-10-18","score":1}],"verified":true,"rising":0,"persistent":false,"opportunity":"6 posts from 6 people in 1 place, about 1 a week over 62 days. Mostly on pola-rs/polars. Tools named alongside: PyPI.","summary":"","summaryBy":""},{"id":"polars-kw-group","statement":"Trouble with Polars group","category":"data-engineering","issue":"kw:group","entity":"polars","entityName":"Polars","domain":"pola.rs","method":"keyword","posts":4,"authors":3,"places":1,"engagement":8,"last7":0,"prev7":2,"momentum":"fading","daysActive":3,"severity":0,"firstPost":"2026-09-07","lastPost":"2026-10-28","firstSeen":"2026-10-24 05:27:06","companies":[{"slug":"polars","name":"Polars","domain":"pola.rs","n":4},{"slug":"pypi","name":"PyPI","domain":"pypi.org","n":4}],"kinds":["github"],"spark":[0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,2,0,0,0,0,0,0,0,0,0,0,0,0],"top":[{"url":"https://github.com/pola-rs/polars/issues/29190","title":"Datetime out-of-range in `group_by_dynamic` streaming engine","kind":"github","source":"pola-rs/polars","author":"kdn36","day":"2026-09-07","score":1},{"url":"https://github.com/pola-rs/polars/issues/30127","title":"GPU rejects covariance in a group aggregation with `corr` and `ErrorExpr` diagnostics","kind":"github","source":"pola-rs/polars","author":"asddfl","day":"2026-10-21","score":0},{"url":"https://github.com/pola-rs/polars/issues/30360","title":"Sliced len() over a concat of string-only scans decodes a row group per input since 2.1.0","kind":"github","source":"pola-rs/polars","author":"Hunterlige","day":"2026-10-28","score":1}],"verified":true,"rising":0,"persistent":false,"opportunity":"4 posts from 3 people in 1 place, about 1 a week over 52 days. Mostly on pola-rs/polars. Tools named alongside: PyPI.","summary":"","summaryBy":""},{"id":"polars-data-quality","statement":"Bad data slips through Polars unnoticed","category":"data-engineering","issue":"data-quality","entity":"polars","entityName":"Polars","domain":"pola.rs","method":"pattern","posts":3,"authors":3,"places":2,"engagement":5,"last7":0,"prev7":0,"momentum":"fading","daysActive":3,"severity":0,"firstPost":"2026-09-04","lastPost":"2026-10-18","firstSeen":"2026-09-25 12:50:30","companies":[{"slug":"polars","name":"Polars","domain":"pola.rs","n":3},{"slug":"pypi","name":"PyPI","domain":"pypi.org","n":1}],"kinds":["github","reddit"],"spark":[0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"top":[{"url":"https://github.com/pola-rs/polars/issues/30044","title":"Partitioned write puts a NULL key and the string \"__HIVE_DEFAULT_PARTITION__\" into the same file: rows silently lost, file sometimes unreada","kind":"github","source":"pola-rs/polars","author":"hanke580","day":"2026-10-18","score":0},{"url":"https://github.com/pola-rs/polars/issues/29164","title":"Feature request: Add Wilder's Smoothing / Moving Average (rma)","kind":"github","source":"pola-rs/polars","author":"jp-0704","day":"2026-09-04","score":3},{"url":"https://www.reddit.com/r/dataengineering/comments/1wpmvdu/python_data_contract_with_polars_dataframe_in_mind/","title":"Python data contract with Polars dataframe in mind?","kind":"reddit","source":"r/dataengineering","author":"u/dikdokk","day":"2026-09-25","score":0}],"verified":true,"rising":0,"persistent":false,"opportunity":"3 posts from 3 people in 2 places, about 1 a week over 45 days. Mostly on pola-rs/polars, r/dataengineering. 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Mostly on pola-rs/polars. 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Problemsby Glyph