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Which issue does this PR close?
Closes #21144. Follows #21291.
Rationale for this change
Add
arrow.parquet.variantto DataFusion's canonical extension type registry, following the thin wrappers used for JSON and other canonical types.Draft: waiting on moving Arrow's
VariantTypefromparquet-variant-computeintoparquet-variant, and adopting an Arrow release containing that move. The current dependency pulls in the compute and JSON crates just to register the extension. Before merging, this PR should depend only onparquet-variantfor that type.What changes are included in this PR?
Add
DFVariantand its canonical registration. The wrapper retains the storage datatype and delegates validation and metadata handling to Arrow'sVariantType. Values use ordinary storage-type formatting.Arrow's incomplete storage-field validation is tracked separately in apache/arrow-rs#11938.
What is the testing strategy for this PR?
No new unit tests for the thin delegation wrapper, consistent with the unformatted extensions in #21291.
Formatting, strict workspace Clippy (
--all-targets --all-features),cargo check -p datafusion-common -p datafusion-expr --offline, and all 1,471 core integration tests passed. The required extended workspace run stopped after one sort memory-limit failure (154 extended tests passed); that test passed when rerun alone. Later workspace test binaries did not run.Are there any user-facing changes?
Yes. The canonical registry recognizes
arrow.parquet.variant, andDFVariantis available throughdatafusion_common::types.