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https://issues.apache.org/jira/browse/CALCITE-4364?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17727450#comment-17727450
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Stamatis Zampetakis commented on CALCITE-4364:
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[~xinchen147] What you are proposing seems to be an improvement. If that's the
case please create a new JIRA ticket and feel free to submit a PR.
> Simplify "a IN (1, 2) AND a = 1" to "a = 1"
> -------------------------------------------
>
> Key: CALCITE-4364
> URL: https://issues.apache.org/jira/browse/CALCITE-4364
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.26.0
> Reporter: Danny Chen
> Assignee: Danny Chen
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.27.0
>
> Time Spent: 7h 20m
> Remaining Estimate: 0h
>
> Calcite should simplify "\{{a IN (1, 2) AND a = 1}}" to "\{{a = 1}}". Check
> this test in {{RexProgramTest}}:
> {code:java}
> @Test void testSimplifyInAnd() {
> // deptno in (20, 10) and deptno = 10
> // ==>
> // deptno = 10
> final RexNode e =
> and(
> in(vInt(), literal(20), literal(10)),
> eq(vInt(), literal(10)));
> checkSimplify(e, "=(?0.int0, 10)");
> }
> {code}
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