fuwhu opened a new pull request #26244: [SPARK-21287][SQL] Remove requirement of fetch_size>=0 from JDBCOptions URL: https://github.com/apache/spark/pull/26244 ### What changes were proposed in this pull request? Remove the requirement of fetch_size>=0 from JDBCOptions to allow negative fetch size. ### Why are the changes needed? To fix [SPARK-21287](https://issues.apache.org/jira/browse/SPARK-21287). Namely, to allow data fetch in stream manner (row-by-row fetch) against MySQL database. ### Does this PR introduce any user-facing change? No ### How was this patch tested? Unit test (JDBCSuite)
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