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feat(datafusion): add common scalar compatibility functions - #1291
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This was referenced Nov 1, 2026
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Purpose
Closes #1285.
Common SQL names split, locate, date, typeof, hex, unhex, size and hour are not registered in SQLContext. Some require semantic adapters rather than simple aliases.
Brief change log
Tests
Regression coverage: Dynamic row inputs, NULL and empty values, split limits/trailing fields/empty patterns, Unicode positions, signed/binary hex, odd/invalid hex, Variant/decimal types, map size and TIME/DATE hour extraction.
Reproduced the missing behavior on the original main before implementation.
Passed the complete DataFusion suite with
TZ=UTC RUST_MIN_STACK=16777216 CARGO_BUILD_JOBS=3 cargo test --locked -p paimon-datafusion --all-targets -- --test-threads=4.Passed Rust 1.98 Clippy for this crate and all its targets with
--no-deps -- -D warnings, formatting and diff checks.Completed multiple review rounds for SQL semantics, boundary behavior and regression quality; fixed the actionable findings and revalidated the final head.
Integration validation: combined with feat(datafusion): support table and column comment DDL #1287, feat(datafusion): support binary casts and byte widths #1288, feat(datafusion): support RLIKE and REGEXP operators #1289, feat(datafusion): support lateral collection generators #1292, feat(datafusion): evaluate immutable constant CALL arguments #1290 in a temporary checkout; the full DataFusion suite, a regression using all six extensions together, Clippy and formatting passed. These PRs are independently based on main; overlapping parser/registration hooks need normal conflict resolution when merged sequentially.
API and Format
Adds SQLContext SQL capabilities. No storage-format or Rust public API changes.
Documentation
Documented syntax, type/null/error behavior and supported limits in
docs/src/sql.md.