wdick opened a new pull request #23362: [MINOR][DOCS]Document subquery support for the `table` parameter URL: https://github.com/apache/spark/pull/23362 Hi, yesterday I spend some time figuring out, how to read only the data I really need from a JDBC connection. It took me way too long. So, I decided to document the solution. Hopefully it will save others like me, which are new to spark, to save some time.
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