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https://issues.apache.org/jira/browse/FLINK-7271?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16608412#comment-16608412
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xueyu commented on FLINK-7271:
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It looks that this issue has alread been resolved, I don't know whether I
misunderstood...the code related seems to be [link
here|https://github.com/apache/flink/blob/master/flink-libraries/flink-table/src/main/scala/org/apache/flink/table/codegen/ExpressionReducer.scala#L52]
> ExpressionReducer does not optimize string-to-time conversion
> -------------------------------------------------------------
>
> Key: FLINK-7271
> URL: https://issues.apache.org/jira/browse/FLINK-7271
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Affects Versions: 1.3.1
> Reporter: Timo Walther
> Priority: Major
>
> Expressions like {{"1996-11-10".toDate}} or {{"1996-11-10
> 12:12:12".toTimestamp}} are not recognized by the ExpressionReducer and are
> evaluated during runtime instead of pre-flight phase. In order to optimize
> the runtime we should allow constant expression reduction here.
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