Issues

• [Enh]: implement {Expr,Series}.approx_quantile in Narwhals

  enhancement
  narwhals-dev/narwhals#4105 · Filter by author lamdavid759 opened on Oct 23, 2026

• Duplicate column names are handled inconsistently across backends (DuckDB and Ibis fail silently)

  bug: incorrect result
  narwhals-dev/narwhals#4103 · Filter by author FBruzzesi opened on Oct 22, 2026
  2

• [Enh]: Polars 2.0 support

  narwhals-dev/narwhals#4101 · Filter by author kamilbroniowski opened on Oct 22, 2026
  2

• [Bug]: DataFrame.rows() / iter_rows() return numpy scalars for pandas nullable dtypes

  narwhals-dev/narwhals#4091 · Filter by author FBruzzesi opened on Oct 18, 2026
  1

• [Bug]: -2**63 // -1 inconsistent across backends, SQLFrame silently returns a float

  narwhals-dev/narwhals#4071 · Filter by author ReguiguiMohamed opened on Oct 13, 2026

• [Enh](discussion): float // 0.0 returns null on every backend except Polars, which one is intended?

  narwhals-dev/narwhals#4070 · Filter by author ReguiguiMohamed opened on Oct 13, 2026

• [Bug]: AttributeError("partially initialized module 'pandas' ...) in multi-threading use case

  bug: it raises an error but shouldn'thigh priority
  narwhals-dev/narwhals#4067 · Filter by author lesteve opened on Oct 13, 2026
  1

• TypeIs guard does not narrow mixed input union in Pyrefly

  narwhals-dev/narwhals#4064 · Filter by author AdrianSosic opened on Oct 12, 2026
  1

• [Bug]: mean_horizontal returns NaN instead of null for all-null rows on PyArrow and DuckDB

  bug: incorrect result
  narwhals-dev/narwhals#4056 · Filter by author FBruzzesi opened on Oct 10, 2026

• [Bug]: mode drops nulls on pandas

  bug: incorrect resultpandas-like
  narwhals-dev/narwhals#4055 · Filter by author FBruzzesi opened on Oct 10, 2026

• maintain_order for DataFrame.join

  enhancement
  narwhals-dev/narwhals#4048 · Filter by author AdrianSosic opened on Oct 9, 2026
  4

• [Bug]: Series.hist() returns a float count column on an empty or all-null column, on pandas-like backends

  narwhals-dev/narwhals#4045 · Filter by author lucaluo925 opened on Oct 8, 2026

• [Bug]: skew() and kurtosis() lose the dtype on an all-null or empty column

  narwhals-dev/narwhals#4044 · Filter by author lucaluo925 opened on Oct 8, 2026
  1

• [Enh](discussion): Support GPU array and tensor export (cuDF ,CuPy) across backends

  enhancement
  narwhals-dev/narwhals#4041 · Filter by author direkkakkar319-ops opened on Oct 6, 2026
  6

• [Bug]: % 0 returns 0 on pandas nullable dtypes, where // 0 returns null after #4011

  narwhals-dev/narwhals#4036 · Filter by author lucaluo925 opened on Oct 6, 2026

• [Bug]: cum_max is wrong for non-positive floats on the PyArrow backend (upstream apache/arrow#51194, fixed but unreleased)

  narwhals-dev/narwhals#4033 · Filter by author lucaluo925 opened on Oct 5, 2026

• Decide which backend= spellings resolve to a plugin

  extensibilityneeds discussion
  narwhals-dev/narwhals#4026 · Filter by author FBruzzesi opened on Oct 4, 2026
  4

• Generalize _hasattr_static into a static "is this really implemented?" check

  enhancementinternalneeds discussion
  narwhals-dev/narwhals#4025 · Filter by author FBruzzesi opened on Oct 4, 2026

• [Bug]: null_count() is not an integer dtype on the DuckDB backend, unlike count() and len()

  bug: incorrect result
  narwhals-dev/narwhals#4024 · Filter by author lucaluo925 opened on Oct 4, 2026
  3

• [Bug]: casting a float column to a signed integer type truncates on pandas and Polars, raises on PyArrow, and rounds on DuckDB

  narwhals-dev/narwhals#4019 · Filter by author lucaluo925 opened on Oct 4, 2026

• [Bug]: integer sum() returns Decimal(38, 0) on the DuckDB backend, and arithmetic on the result raises

  narwhals-dev/narwhals#4014 · Filter by author lucaluo925 opened on Oct 2, 2026
  3

• pandas: .cast() inside group_by().agg() is dropped when the aggregation takes the complex group-by path

  narwhals-dev/narwhals#4005 · Filter by author LeparaLaMapara opened on Sep 29, 2026

• [Enh]: Expose __version__ from stable namespaces

  enhancement
  narwhals-dev/narwhals#3973 · Filter by author maxzw opened on Sep 21, 2026

• [Bug]: Expr.clip with a scalar-like receiver behaves differently on every backend

  api designbug: incorrect resultneeds discussion
  narwhals-dev/narwhals#3964 · Filter by author FBruzzesi opened on Sep 19, 2026

• [Enh]: Document and test chDB interoperability through Arrow

  narwhals-dev/narwhals#3932 · Filter by author ShawnChen-Sirius opened on Sep 9, 2026