HyukjinKwon opened a new pull request #25224: [SPARK-28321][DOCS][FOLLOW-UP] Update migration guide by 0-args Java UDF's internal behaviour change URL: https://github.com/apache/spark/pull/25224 ## What changes were proposed in this pull request? This PR proposes to add a note in the migration guide. See https://github.com/apache/spark/pull/25108#issuecomment-513526585 ## How was this patch tested? N/A
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