Fixes to Spark API show() and udf.register()#550

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Shooter23 wants to merge 4 commits into

duckdb:mainfrom

Commits on Jul 16, 2026

Convert Spark show and fix create_function in udf.register.
Shooter23
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Commits on Jul 17, 2026

Commits on Jul 18, 2026

Set Spark UDF return type to None if passed None.
Shooter23
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