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https://issues.apache.org/jira/browse/CALCITE-4621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17353106#comment-17353106
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Ruben Q L commented on CALCITE-4621:
------------------------------------
Thanks for the feedback [~julianhyde]. Those are valid points indeed. I'll
rework {{RelOptRulesTest}} as soon as I can.
> SemiJoinRule throws AssertionError on ANTI join
> -----------------------------------------------
>
> Key: CALCITE-4621
> URL: https://issues.apache.org/jira/browse/CALCITE-4621
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.26.0
> Reporter: Ruben Q L
> Assignee: Ruben Q L
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.27.0
>
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> Credits to [~thomas.rebele] for discovering the issue.
> When SemiJoinRule (both {{CoreRules.JOIN_TO_SEMI_JOIN}} and
> {{CoreRules.PROJECT_TO_SEMI_JOIN}}) matches an ANTI join, it fails with the
> following error:
> {noformat}
> java.lang.AssertionError: ANTI
> at org.apache.calcite.rel.rules.SemiJoinRule.perform(SemiJoinRule.java:122)
> ...
> {noformat}
> The problem is that the rule config only forbids RIGHT and FULL joins, and
> lets ANTI go through. Later when the rule is actually executed, joins with
> type ANTI cannot be handled, hence the {{AssertionError}}.
> The rule config must be adapted to forbid also ANTI joins.
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