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https://issues.apache.org/jira/browse/CALCITE-1289?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15326104#comment-15326104
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MinJi Kim commented on CALCITE-1289:
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https://github.com/apache/calcite/pull/248
> RexUtil.simplifyCase() should account for nullability
> -----------------------------------------------------
>
> Key: CALCITE-1289
> URL: https://issues.apache.org/jira/browse/CALCITE-1289
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: MinJi Kim
> Assignee: Julian Hyde
>
> RexUtil.simplify() returns incorrect type information if the RexNode is a
> CASE(CONDITION, TRUE, FALSE). In this case, the CASE RexNode is a Boolean
> with isNullable == false. But, with the simplify, RexUtil.simplify returns
> CONDITION. When CONDITION has isNullable == true, the returned RexNode does
> not match the row type and fails to transform (vice versa).
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