Issues

• concat of an empty and a non-empty frame materializes int64 where pandas gives float64, and modin's own .dtypes disagrees

  modin-project/modin#7712 · Filter by author ptimizeroracle opened on Sep 29, 2026

• Series.clip(lower=<list-like>) raises ValueError instead of broadcasting the thresholds

  modin-project/modin#7711 · Filter by author ptimizeroracle opened on Sep 29, 2026

• Series.mode(dropna=False) drops NaN instead of counting it as a value

  modin-project/modin#7710 · Filter by author ptimizeroracle opened on Sep 29, 2026

• Series.str.extractall returns a Series instead of a DataFrame for a single capture group

  modin-project/modin#7709 · Filter by author ptimizeroracle opened on Sep 29, 2026

• TEST: Unbounded fuzzydata version pin in dev requirements

  modin-project/modin#7705 · Filter by author suhailrehman opened on Aug 27, 2026

• Future maintenance of modin

  question ❓Triage 🩹
  modin-project/modin#7704 · Filter by author BwL1289 opened on Jul 14, 2026

• BUG: Resample.mean() raises error on pandas 2.3.3 with native execution

  bug 🦗P3
  modin-project/modin#7697 · Filter by author sfc-gh-joshi opened on Apr 16, 2026

• Suggestion: reference WFGY Problem Map (RAG / LLM debugging checklist) for Modin users

  modin-project/modin#7696 · Filter by author onestardao opened on Feb 21, 2026

• BUG: groupby().agg(<constant>) lead to inconsistencies with Pandas

  bug 🦗Triage 🩹
  modin-project/modin#7694 · Filter by author asddfl opened on Dec 7, 2025

• BUG: groupby() and max() lead to inconsistencies with Pandas

  bug 🦗Triage 🩹
  modin-project/modin#7693 · Filter by author asddfl opened on Dec 2, 2025

• BUG: Expressions combining .loc[] and .fillna() causes inconsistencies with Pandas

  bug 🦗Triage 🩹
  modin-project/modin#7692 · Filter by author asddfl opened on Nov 26, 2025

• Modin df becomes pandas df when sent to a ray remote. How can I stop it doing that?

  question ❓Triage 🩹
  modin-project/modin#7691 · Filter by author Liquidmasl opened on Nov 25, 2025
  1

• BUG: Data types reading from csv file differ from those of Pandas

  bug 🦗Triage 🩹
  modin-project/modin#7690 · Filter by author asddfl opened on Nov 25, 2025

• BUG: series with tuple name has a column multiindex in internal pandas frame

  bug 🦗
  modin-project/modin#7689 · Filter by author sfc-gh-mvashishtha opened on Oct 2, 2025

• BUG: modin.pandas.eval() does not work at all

  bug 🦗P2
  modin-project/modin#7656 · Filter by author sfc-gh-mvashishtha opened on Sep 2, 2025
  2

• PERF: Reduce excessive memory usage in Ray

  P1Performance 🚀
  modin-project/modin#7655 · Filter by author sfc-gh-joshi opened on Aug 27, 2025

• BUG: df.attrs fails with AttributeError: can't set attribute

  bug 🦗P2
  modin-project/modin#7652 · Filter by author sfc-gh-jkew opened on Aug 26, 2025
  1

• BUG: 'nrows' parameter do not seem to be honoured in read_excel()

  bug 🦗P2pandas concordance 🐼
  modin-project/modin#7651 · Filter by author deathstalkr opened on Aug 19, 2025
  

• BUG: combine_first casts dtypes, pandas does not

  bug 🦗P2
  modin-project/modin#7642 · Filter by author Liquidmasl opened on Aug 6, 2025
  3

• PandasOnRay doesn't implement reset_index for non-default names parameter

  bug 🦗hybrid-executionP1
  modin-project/modin#7633 · Filter by author sfc-gh-vrpatel opened on Jul 25, 2025

• BUG: SeriesGroupBy.diff() raises TypeError for datetime64[ns] column with Pandas backend

  bug 🦗
  modin-project/modin#7631 · Filter by author sfc-gh-mvashishtha opened on Jul 24, 2025
  2

• FEAT: test mpi4py >= 4.1 on ubuntu by using appropriate mpich versions

  dependencies 🔗Testing 📈
  modin-project/modin#7615 · Filter by author sfc-gh-mvashishtha opened on Jun 27, 2025

• CI is broken due to MPI install issue

  CIP0
  modin-project/modin#7613 · Filter by author sfc-gh-mvashishtha opened on Jun 26, 2025
  1

  

• df_equals still skips dtypes check for empty frames

  Testing 📈
  modin-project/modin#7600 · Filter by author sfc-gh-mvashishtha opened on Jun 4, 2025

• BUG: QueryCompilerCaster breaks NamedTuple arguments

  bug 🦗hybrid-executionP1
  modin-project/modin#7594 · Filter by author sfc-gh-joshi opened on May 29, 2025