anchovYu opened a new pull request, #36103:
URL: https://github.com/apache/spark/pull/36103
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### What changes were proposed in this pull request?
Add a legacy flag `spark.sql.legacy.lpadRpadForBinaryType.enabled` for the
breaking change introduced in https://github.com/apache/spark/pull/34154.
The flag is enabled by default. When it is disabled, restore the pre-change
behavior that there is no special handling on `BINARY` input types.
### Why are the changes needed?
The original commit is a breaking change, and breaking changes should be
encouraged to add a flag to turn it off for smooth migration between versions.
### Does this PR introduce _any_ user-facing change?
With the default value of the conf, there is no user-facing difference.
If users turn this conf off, they can restore the pre-change behavior.
### How was this patch tested?
Through unit tests.
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