Problemsby Glyphpandas upgrades break working setups
10 posts from 10 people10d activeFading, +0 this week
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Nested tuple column labels fail JSON/YAML schema roundtrips
...the bug** A pandas schema with a nested tuple column label validates its dataframe, but fails to load its own JSON or YAML output with `TypeError: unhashable type: 'list'`. - [x] I checked related issues and PRs; #2182 / #2268 cover flat tuple labels, which still work. This is...
[BUG] Automatic dataset digest fails for empty Arrow-backed pandas string columns
...fails. Non-empty data follows a different dtype path and passed our local checks. ### Workaround checked Passing the public `digest=` option avoids automatic digest calculation. For example, `mlflow.data.from_pandas(frame, name="empty", digest="empty-schema-reproducer")`...
[BUG] `_infer_schema` raises on unnamed pandas Series with missing values (`infer_signature` falls back to AnyType)
> [!WARNING] > Before submitting a PR, please make sure that: > - A maintainer has triaged this issue and applied the `ready` label > - This issue has no assignee > - No duplicate PR exists > > PRs not meeting these requirements may be automatically closed. **Where:** Local...
BUG: interval_range silently produces empty intervals and incorrect interval counts for large int64 values
...9.14.0 adbc-driver-postgresql: None adbc-driver-sqlite : None bs4 : 4.14.3 blosc : None bottleneck : None dataframe-api-compat : None fastparquet : None fsspec
[Bug] rank post-processing ignores empty-string grouping column names
### Bug description The `rank` post-processing operation ignores `group_by=""`, even when the DataFrame has a column with that name. It computes a global percentile rank instead of ranking within each group. An empty string is a valid pandas column label. `group_by` is typed as...
BUG: read_csv(engine="pyarrow") takes the column count from the first row, not from names
### Pandas version 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 pandas. - [x] I have confirmed this bug exists on the main branch of pandas. ### Reproducible Example ### Issue...
[Bug]: md_to_df adds a column or returns None with CRLF/trailing row whitespace
### Bug Description `md_to_df` changes the shape of a pipe-bounded Markdown table when rows use CRLF or have whitespace after the closing pipe. A two-column LF table parses correctly; CRLF or one trailing space/tab creates an extra all-NaN `Unnamed: 2` column. Two trailing...
Regression: pandas 3.1.0 in cygwin throws error in subprocess
...reader in parallel The error I get in cygwin is ### Issue Description I will tell the workaround I found ### Expected Behavior no error ### Installed Versions 0 [main] python3.12 946 child_info_fork::abort: address space needed by '_ujson.cpython-312-x86_64-cygwin.dll'...
BUG: addition of non-UTC DatetimeArray with large Timedelta returns None
With tz-naive (or UTC), this works fine: But when the array has a non-UTC timezone, it just returns nothing (`None`): This happens on main, and also on 3.0.5, but worked fine on 2.3. So this seems a regression compared to 2.x.
BUG: Pandas 3: RangeIndex values can be modified from the outside
...IPython : 9.16.1 adbc-driver-postgresql: None adbc-driver-sqlite : None bs4 : 4.15.0 bottleneck : None fastparquet : None fsspec : 2026.4.0 html5lib : None hypothesis : None gcsfs : None jinja2 : 3.1.6 lxml.etree : 6.1.2 matplotlib : 3.11.1 numba : 0.66.0 numexpr : None odfpy :...
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About this problem
Evidence
10 posts from 10 people in 5 places, about 1 a week over 67 days. Mostly on pandas-dev/pandas, mlflow/mlflow, run-llama/llama_index. Tools named alongside: PostgreSQL, SQLite, GitHub, MLflow.
Frustration Frustration 0 of 3· Seen on GitHub issues
How it was grouped
Posts that state a pain and match the "breaking-changes" rule about pandas. First post Aug 28, 2026, latest Nov 2, 2026. Corroborated: 3 or more posts from 2 or more people or places. Method
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Trouble with pandas read
Top post: "CI: sanitizers environment has no pyarrow, so the read_csv pyarrow string path is never sanitized", one of 5 posts from 5 people on GitHub issues.
Trouble with pandas raises
Top post: "read_csv with usecols raises IndexError in low-memory mixed-dtype warning path", one of 5 posts from 5 people on GitHub issues.
pandas error messages are cryptic
5 posts from 5 people on GitHub issues.
Trouble with pandas index
Top post: "DOC: document `pd.Index.to_flat_index`", one of 4 posts from 4 people on GitHub issues.
Trouble with pandas instead
Top post: "`pd.merge` gives `float`s instead of integer extensions", one of 4 posts from 4 people on GitHub issues.
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4 posts from 4 people on GitHub issues.
pandas builds are slow or flaky
4 posts from 1 person on GitHub issues. Unverified.
Trouble with pandas dtype
Top post: "pd.to_numeric with errors=coerce fails to produce actual NA values when applied to dtype string[pyarrow]", one of 3 posts from 3 people on GitHub issues.
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