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[SPARK-45430] Fix for FramelessOffsetWindowFunction when IGNORE NULLS…
… and offset > rowCount ### What changes were proposed in this pull request? This is a fix for the failure when function that utilized `FramelessOffsetWindowFunctionFrame` is used with `ignoreNulls = true` and `offset > rowCount`. e.g. ``` select x, lead(x, 5) IGNORE NULLS over (order by x) from (select explode(sequence(1, 3)) x) ``` ### Why are the changes needed? Fix existing bug ### Does this PR introduce _any_ user-facing change? No ### How was this patch tested? Modify existing unit test to cover this case ### Was this patch authored or co-authored using generative AI tooling? No Closes #43236 from vitaliili-db/SPARK-45430. Authored-by: Vitalii Li <vitalii.li@databricks.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com> (cherry picked from commit 32e1e58) Signed-off-by: Wenchen Fan <wenchen@databricks.com>
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