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https://issues.apache.org/jira/browse/SPARK-21587?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16111582#comment-16111582
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Hyukjin Kwon commented on SPARK-21587:
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User 'joseph-torres' has created a pull request for this issue:
https://github.com/apache/spark/pull/18790
> Filter pushdown for EventTime Watermark Operator
> ------------------------------------------------
>
> Key: SPARK-21587
> URL: https://issues.apache.org/jira/browse/SPARK-21587
> Project: Spark
> Issue Type: Bug
> Components: Structured Streaming
> Affects Versions: 2.2.0
> Reporter: Jose Torres
>
> If I have a streaming query that sets a watermark, then a where() that
> pertains to a partition column does not prune these partitions and they will
> all be queried, greatly reducing performance for partitioned tables.
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