Github user asfgit closed the pull request at:
https://github.com/apache/spark/pull/17721
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GitHub user windpiger opened a pull request:
https://github.com/apache/spark/pull/17721
[SPARK-20013][SQL]merge renameTable to alterTable in ExternalCatalog
## What changes were proposed in this pull request?
merge renameTable to alterTable in ExternalCatalog has some
