[branch-52] Cherry-pick apache/datafusion#20533#96
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gh-worker-dd-mergequeue-cf854d[bot] merged 1 commit intoDataDog:branch-52from Mar 26, 2026
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## Which issue does this PR close? - Closes apache#20526. ## Rationale for this change Per Postgres and the SQL spec, `cardinality()` of an empty array should be zero; we previously returned `NULL`. Along the way, fix another bug: we previously returned `0` for the cardinality of an untyped `NULL` and `NULL` for the cardinality of a typed null (e.g., `NULL::int[]`). We should return `NULL` in both cases. ## What changes are included in this PR? Bug fixes, update SLT. ## Are these changes tested? Yes. ## Are there any user-facing changes? Yes: the behavior of `cardinality` has changed, albeit the previous behavior was incorrect. (cherry picked from commit e684994)
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cherry-picks apache#20533
necessary to cherry pick in #95 which has a fix for
string_to_array