feat: implement variant_length UDF#61
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Closes datafusion-contrib#41 Returns the number of elements in a Variant Array or Object at the given path. Returns NULL for non-array/object variants or NULL inputs. - variant_length(VariantArray, path) -> UInt64 (Nullable) - Supports scalar and columnar variant inputs with scalar path - 5 unit tests covering array, object, nested path, primitive->NULL, columnar
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Closes #41
Summary
Implements
variant_length(VariantArray, path)as described in #41.Returns the number of elements in a Variant Array or Object at the given path. Returns
NULLfor non-array/object variants (e.g. primitives) orNULLinputs.Return type
UInt64(Nullable)Behavior
[1, 2, 3]at""3{"a": 1, "b": 2}at""2{"a": [1,2,3,4]}at"a"442(primitive)NULLNULLvariantNULLTests
5 unit tests covering scalar array, scalar object, nested path, primitive→NULL, and columnar input.