feat(index): support distributed ZoneMap index - #5214
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yanghua merged 3 commits intoJul 22, 2026
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ZoneMap is a min/max skip index supported by lance since early versions. Lance 9.0.0b1 extended create_index_uncommitted to handle ZoneMap segments (lance#7177), enabling the same distributed segment workflow already used for BTREE and BITMAP. Changes: - Add "ZONEMAP" to _SCALAR_SEGMENT_INDEX_TYPES so the segment workflow (create_index_uncommitted → commit_existing_index_segments) is used - Add "ZONEMAP" to supported_distributed_types, removing the ValueError - Extend "BTREE" type-validation case to "BTREE" | "ZONEMAP" (same supported column types: int, float, string) - Add a version guard requiring pylance >= 9.0.0b1 for ZONEMAP - Bump minimum pylance dependency to 9.0.0b10 - Add TestDistributedZoneMapIndexing with three tests covering int/string columns and query-result correctness against a non-indexed baseline Closes lance-format#5213
pyproject.toml already requires pylance>=9.0.0b10, so the runtime version check and test skipif decorator are unnecessary.
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Closes #5213
Summary
"ZONEMAP"to_SCALAR_SEGMENT_INDEX_TYPESso the segment workflow (create_index_uncommitted->commit_existing_index_segments) is chosen, matching how BTREE and BITMAP are built"ZONEMAP"tosupported_distributed_types, removing theValueErrorthat previously blocked it"BTREE"column-type validation case to"BTREE" | "ZONEMAP"with the same supported types: int, float, and string8.0.0b11->9.0.0b10TestDistributedZoneMapIndexingwith three tests:test_distributed_zonemap_index_basic— build on int column, verifyindex_type == "ZoneMap"test_zonemap_query_results_match_baseline— range filter results match non-indexed baselinetest_distributed_zonemap_index_string_column— build on string columnVerification