Problemsby GlyphTrouble with Polars instead
6 posts from 6 people6d activeFading, +0 this week
Posts per day
The posts behind it
CPU Float64 modulo returns `0.0` instead of `1.0` for `1e20 % 3.0`
### 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...
Hive partition value `k=` of a Categorical/Enum key is read back as null instead of "" (String keys were fixed in #24546)
### 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 writer keeps `""`...
Series.to_list() panics on out-of-range datetimes instead of raising an error
### 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 Converting a Datetime value...
`str.{to_datetime,to_time,to_date}` with `format=None` return nulls instead of raising on the streaming engine
### 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 When automatic format...
SQL: ORDER BY on an ungrouped QUANTILE_CONT or QUANTILE_DISC aggregate returns one row per input row instead of a single row.
### 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 Yet another polars SQL issue....
dt.offset_by panics instead of raising when the offset date exceeds the internal Date range
...to a Python object takes place, i.e. it's the internal date-arithmetic step itself that fails to construct the target date and unwraps on the error instead of propagating it. Same panic reproduces with `"mo"` units too (e.g. `"2147483647mo"`), and via `Series.dt.offset_by`...
Companies and products named
About this problem
Evidence
6 posts from 6 people in 1 place, about 1 a week over 62 days. Mostly on pola-rs/polars. Tools named alongside: PyPI.
Frustration Frustration 0 of 3· Seen on GitHub issues
How it was grouped
Posts about Polars with no known issue, sharing the word "instead". First post Aug 28, 2026, latest Oct 28, 2026. Corroborated: 3 or more posts from 2 or more people or places. Method
Other Polars problems
Polars upgrades break working setups
23 posts from 16 people on GitHub issues.
Polars users keep filing bugs
Top post: "Consider upgrading the brotli crate (CVE-2026-111497)", one of 22 posts from 15 people on GitHub issues.
Trouble with Polars column
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.
Trouble with Polars parquet
Top post: "`is_in` with more than 100 values does not skip Parquet row groups between the values", one of 7 posts from 7 people on GitHub issues.
Trouble with Polars unique
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.
Trouble with Polars join
Top post: "Coalescing full join on Int32-vs-Int64 keys with `unique` incorrect", one of 6 posts from 6 people on GitHub issues.
Trouble with Polars group
Top post: "Datetime out-of-range in `group_by_dynamic` streaming engine", one of 4 posts from 3 people on GitHub issues.
Bad data slips through Polars unnoticed
3 posts from 3 people on GitHub issues, Reddit.
Polars runs out of memory
3 posts from 3 people on GitHub issues.
Trouble with Polars read
Top post: "`read_database` raises `ImportError` with SQLAlchemy 2.1 when `greenlet` is not installed", one of 3 posts from 3 people on GitHub issues.
Polars error messages are cryptic
3 posts from 2 people on GitHub issues.
Trouble with Polars value
Top post: "polars.read_excel() value error on very large date", one of 3 posts from 3 people on GitHub issues.
History