Issues

• Native schema inspection fails for DuckDB stored-table joins with Ibis memtables

  mountainash-io/mountainash#400 · Filter by author discreteds opened on Oct 17, 2026
  1

• Upstream: Ibis DuckDB interval export fails Arrow duration cast

  mountainash-io/mountainash#389 · Filter by author discreteds opened on Oct 14, 2026
  1

• Upstream: Ibis/pandas 2 interval inference emits invalid DuckDB INTERVAL NANOSECOND DDL

  mountainash-io/mountainash#386 · Filter by author discreteds opened on Oct 14, 2026
  4

• Expose list-element expressions for native per-item datetime normalization

  mountainash-io/mountainash#370 · Filter by author discreteds opened on Oct 12, 2026

• Ibis UTC timestamp literals cannot union with native timestamp precision 6

  mountainash-io/mountainash#369 · Filter by author discreteds opened on Oct 12, 2026

• Polars filter(False) retains a row after a literal-only projection

  mountainash-io/mountainash#367 · Filter by author discreteds opened on Oct 11, 2026

• Relation.unique() loses every column in inferred schema

  mountainash-io/mountainash#365 · Filter by author discreteds opened on Oct 11, 2026

• with_row_index executes but omits generated ordinal from schema

  mountainash-io/mountainash#366 · Filter by author discreteds opened on Oct 11, 2026

• Native regex projection executes but composed column schema is opaque

  mountainash-io/mountainash#364 · Filter by author discreteds opened on Oct 11, 2026

• Public expression-AST field-reference introspection + ibis literal-first '+' compile bug (from pointbreak Phase 4b)

  mountainash-io/mountainash#226 · Filter by author discreteds opened on Jul 16, 2026

• relations: Relation.unique(keep=...) accepts but silently ignores keep

  mountainash-io/mountainash#218 · Filter by author discreteds opened on Jul 11, 2026

• expressions: no cumulative/prefix op over list columns (ancestor dotted prefixes)

  mountainash-io/mountainash#217 · Filter by author discreteds opened on Jul 11, 2026

• pydata egress: crashes on DataFrame columns with non-identifier names

  mountainash-io/mountainash#116 · Filter by author discreteds opened on May 6, 2026

• expressions: no test validates dispatch routes to concrete implementations, not stubs

  mountainash-io/mountainash#115 · Filter by author discreteds opened on May 6, 2026

• expressions: __getattr__ dispatch can route to inherited Protocol stubs

  mountainash-io/mountainash#114 · Filter by author discreteds opened on May 6, 2026

• mountainash-data: Add ClickHouse dialect to IbisBackend

  mountainash-io/mountainash#108 · Filter by author discreteds opened on May 5, 2026

• String match strategies (PREFIX, SUFFIX, CONTAINS) fail on pandas/narwhals backends

  bug
  mountainash-io/mountainash#89 · Filter by author discreteds opened on Apr 28, 2026
  1

• ibis-polars backend missing WindowFunction translation — blocks with_row_index

  mountainash-io/mountainash#78 · Filter by author discreteds opened on Apr 8, 2026
  1

• PLAN-010 Phase 9: Create Geometry API Builder Protocol (Stubs)

  enhancement
  mountainash-io/mountainash#69 · Filter by author discreteds opened on Dec 30, 2025 · API Builder Protocol Alignment

• PLAN-010 Phase 8: Create Window API Builder Protocol

  enhancement
  mountainash-io/mountainash#68 · Filter by author discreteds opened on Dec 30, 2025 · API Builder Protocol Alignment

• PLAN-010 Phase 7: Create Aggregate API Builder Protocols

  enhancement
  mountainash-io/mountainash#67 · Filter by author discreteds opened on Dec 30, 2025 · API Builder Protocol Alignment

• PLAN-010 Phase 6: Expand scalar_string API Builder Protocol

  enhancement
  mountainash-io/mountainash#66 · Filter by author discreteds opened on Dec 30, 2025 · API Builder Protocol Alignment

• PLAN-010 Phase 5: Expand scalar_datetime API Builder Protocol

  enhancement
  mountainash-io/mountainash#65 · Filter by author discreteds opened on Dec 30, 2025 · API Builder Protocol Alignment

• PLAN-010 Phase 4: Complete scalar_logarithmic API Builder Protocol

  enhancement
  mountainash-io/mountainash#64 · Filter by author discreteds opened on Dec 30, 2025 · API Builder Protocol Alignment

• PLAN-010 Phase 3: Expand scalar_arithmetic API Builder Protocol

  enhancement
  mountainash-io/mountainash#63 · Filter by author discreteds opened on Dec 30, 2025 · API Builder Protocol Alignment