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https://issues.apache.org/jira/browse/SPARK-33315?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17224453#comment-17224453
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Apache Spark commented on SPARK-33315:
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User 'wangyum' has created a pull request for this issue:
https://github.com/apache/spark/pull/30222
> simplify CaseWhen with EqualTo
> ------------------------------
>
> Key: SPARK-33315
> URL: https://issues.apache.org/jira/browse/SPARK-33315
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.1.0
> Reporter: Yuming Wang
> Priority: Major
>
> {code:sql}
> create table t(a int, b int, c int) using parquet;
> SELECT *
> FROM (SELECT CASE
> WHEN a = 100 THEN 1
> WHEN b > 1000 THEN 2
> WHEN c IS NOT NULL THEN 3
> END AS x
> FROM t) tmp
> WHERE x = 2
> {code}
> {noformat}
> Before this PR:
> Filter (CASE WHEN (a#1 = 100) THEN 1 WHEN (b#2 > 1000) THEN 2 WHEN
> isnotnull(c#3) THEN 3 END = 2)
> After this PR:
> Filter (b#2 > 1000)
> {noformat}
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