gengliangwang opened a new pull request #31439:
URL: https://github.com/apache/spark/pull/31439
### What changes were proposed in this pull request?
This PR is to backport https://github.com/apache/spark/pull/31421 and
https://github.com/apache/spark/pull/31421 to branch 3.1
It is a follow up for https://github.com/apache/spark/pull/30538.
It adds a legacy conf
`spark.sql.legacy.parseNullPartitionSpecAsStringLiteral` in case users wants
the legacy behavior.
It also adds document for the behavior change.
### Why are the changes needed?
In case users want the legacy behavior, they can set
`spark.sql.legacy.parseNullPartitionSpecAsStringLiteral` as true.
### Does this PR introduce _any_ user-facing change?
Yes, adding a legacy configuration to restore the old behavior.
### How was this patch tested?
Unit test.
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