weixiuli opened a new pull request #26280: [SPARK-14922][SPARK-17732][SPARK-23866][SQL] Support partition filter in ALTER TABLE DROP PARTITION and batch dropping PARTITIONS URL: https://github.com/apache/spark/pull/26280 ### What changes were proposed in this pull request? Spark only can drop partitions by exact values. For instance, Spark doesn't support: ALTER TABLE mytable DROP PARTITION(mydate < '2018-04-06') The PR adds the support to this syntax too. The PR takes input from the effort in #19691 by @DazhuangSu , in #20999 by @mgaido91 , , there are some related PRs: #15987,#16036,#19691,#15704. some related issues: https://issues.apache.org/jira/browse/SPARK-14922 https://issues.apache.org/jira/browse/SPARK-17732 https://issues.apache.org/jira/browse/SPARK-23866 ### How was this patch tested? Add unittests.
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