[SPARK-55492] Validate that eventTime in withWatermark is top-level column #54254
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What changes were proposed in this pull request?
Validate that eventTime in withWatermark is top-level column.
Why are the changes needed?
Currently passing nested field to withWatermark results in an internal error.
Does this PR introduce any user-facing change?
No.
How was this patch tested?
Added a unit test.
Was this patch authored or co-authored using generative AI tooling?
Yes.