I want to use Spark to process some data from a JDBC source. But to begin with, instead of reading original tables from JDBC, I want to run some queries on the JDBC side to filter columns and join tables, and load the query result as a table in Spark SQL.I want to use Spark to process some data from a
阅读背景：
如何在jdbc数据源中使用子查询来获取dbtable选项？
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