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Posted to github@datafusion.apache.org by "Jefffrey (via GitHub)" <gi...@apache.org> on 2026/03/02 12:29:47 UTC

Re: [PR] fix: Fix Spark `slice` function `Null` type to `GenericListArray` casting issue [datafusion]

Jefffrey commented on PR #20469:
URL: https://github.com/apache/datafusion/pull/20469#issuecomment-3984103917

   > > This seems to suggest return type should be list of nulls instead of just null
   > 
   > Yes, latest fix aims to address this by returning `NullArray` instead of Scalar `Null` value.
   
   Sorry I don't see how this relates? I mean it seems to suggest that a `DataType::Null` input has a `DataType::List(Null)` output, according to my PySpark test. But maybe the test was incorrect, since perhaps Spark introduces some casts? Could we confirm the behaviour if we want to align with Spark here?


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