Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/15868
Sorry for late response, @gatorsmile and @srowen .
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> However, when users use the DataFrameWriter, this is not available.
Maybe, in the future, we can add another option parameter (e.g., explain) for
outputting the query plan? This is a low priority issue.
Do you mean to print out the query plan of `df` of `DataFrameWriter` right?
* It's possible, but it should be done by some API like `save` instead of
`option`.
* For the `save` operation, it makes another plan like
`InsertIntoHadoopFsRelationCommand` or `foreachPartition` in JDBCUtils. So, it
looks not easy to print out the whole logic.
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> why not just let the user repartition the DataFrame if desired?
Yes. I asked the same question in the JIRA issue. But, the original demand
of this issue is a **pure** SQL-based approach. We cannot call `repartition` in
SQL language environment.
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