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Add missing conditional functions#1464

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timsaucer wants to merge 3 commits intoapache:mainfrom
timsaucer:add-missing-conditional-functions
Draft

Add missing conditional functions#1464
timsaucer wants to merge 3 commits intoapache:mainfrom
timsaucer:add-missing-conditional-functions

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Which issue does this PR close?

Closes #1449

Rationale for this change

There are a few methods missing from the Python library, so this exposes them.

What changes are included in this PR?

Exposes python functions.
Adds unit tests.

Are there any user-facing changes?

Addition only.

timsaucer and others added 3 commits March 29, 2026 19:18
…che#1449)

Expose four conditional functions from upstream DataFusion that were
not yet available in the Python bindings.

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>
Tests cover multiple data types (integers, strings), null handling
(all-null, partial-null), multiple arguments, and ifnull/nvl equivalence.

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>
Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>
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Add missing conditional functions (greatest, least, nvl2, ifnull)

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