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https://issues.apache.org/jira/browse/CALCITE-811?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14641120#comment-14641120
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Julian Hyde commented on CALCITE-811:
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My guess is that the nullability of columns changes when the expression is
pulled up, and therefore the RexInputRef will need to be updated to the new
type. Make sure you run with asserts enabled!
RexUtil.fixUp does something similar to what you want.
> Extend JoinProjectTransposeRule with option to support outer joins
> ------------------------------------------------------------------
>
> Key: CALCITE-811
> URL: https://issues.apache.org/jira/browse/CALCITE-811
> Project: Calcite
> Issue Type: New Feature
> Components: core
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
>
> We would like to extend this rule to support also outer joins.
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