MaxGekk opened a new pull request #26066: [SPARK-24640][SQL][FOLLOWUP] Update the SQL migration guide about `size(NULL)` URL: https://github.com/apache/spark/pull/26066 ### What changes were proposed in this pull request? The commit https://github.com/apache/spark/commit/4e6d31f570d212ddb2044df88b5440ebb1108e3c changed default behavior of `size()` for the `NULL` input. In this PR, I propose to update the SQL migration guide. ### Why are the changes needed? To inform users about new behavior of the `size()` function for the `NULL` input. ### Does this PR introduce any user-facing change? No ### How was this patch tested? N/A
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