Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/15966
I found a way to verify the coalesce logics of JDBC writing. See my PR:
https://github.com/apache/spark/pull/15975 It added `numPartition` into
`JDBCRelation`.
With minor code changes, you can see the adjusted `numPartition` in the
output of `EXPLAIN`.
```Scala
sql("INSERT INTO TABLE PEOPLE1 SELECT * FROM PEOPLE").explain(true)
```
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