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Add `UnionArray` (#8834) ## Rationale for this change Tracking issue: #8769 This is the array layer of the Union stack. The compute integration has been split into the stacked follow-up #8884. ## What changes are included in this PR? - Adds the canonical sparse `UnionArray` encoding with nullable u8 type IDs and row-aligned children. - Adds construction and invariant validation, typed accessors, scalar access, top-level validity, serialization, and session registration. - Registers UnionArray as the canonical representation for Union dtypes. - Leaves filter, take, slice, mask, cast, aggregate, constant/chunked canonicalization, and compression support to #8884. I think that this is a mostly straightforward implementation. The one implementation thing I will shout out is that we do not validate that the entire type IDs array has valid type IDs. If we come across an invalid type ID, we just panic, and that is similar behavior to `DictArray` validation. ## What APIs are changed? Are there any user-facing changes? Adds the public Union, UnionArray, UnionArrayExt, and UnionDataParts APIs. --------- Signed-off-by: Connor Tsui <connor.tsui20@gmail.com>

develop

2 hours ago

Removed `.copied` Signed-off-by: Connor Tsui <connor.tsui20@gmail.com>

ct/union-array

3 hours ago

Removed `.copied` Signed-off-by: Connor Tsui <connor.tsui20@gmail.com>

ct/union-array

4 hours ago

Support fixed-size list length bounds Signed-off-by: Matt Katz <mhkatz97@gmail.com>

mk/list-shape-stats

5 hours ago

Update Python file size doctests Signed-off-by: Connor Tsui <connor.tsui20@gmail.com>

ct/fixed-width-encoding

7 hours ago

Reuse typed kernels for fixed-size binary Signed-off-by: Connor Tsui <connor.tsui20@gmail.com>

ct/fixed-width-encoding

7 hours ago

Fix x86 fixed-width take fallback Signed-off-by: Connor Tsui <connor.tsui20@gmail.com>

ct/fixed-width-primitive-decimal

7 hours ago

Record skipping-index benchmark findings Signed-off-by: Connor Tsui <connor.tsui20@gmail.com>

ct/skipping-index

7 hours ago

Latest Branches

+43%

Add `UnionArray`#8834

4 hours ago

a5e3b60

ct/union-array

-11%

Add list length min-max statistics#8886

5 hours ago

45e424f

mk/list-shape-stats

-6%

Add fixed-size binary support#8865

7 hours ago

460d6dc

ct/fixed-width-encoding

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