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https://issues.apache.org/jira/browse/CALCITE-2201?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16394285#comment-16394285
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Volodymyr Vysotskyi commented on CALCITE-2201:
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[~julianhyde], I agree with you that the most of these
{{RelOptUtil.createProject}} methods do the same thing, so I made them
deprecated and replaced their usage. Just still used existing method
{{RelOptUtil.createProject(RelNode, List<? extends RexNode>, List<String>,
boolean, RelBuilder)}} since it does greater things than just
{{RelBuilder.project()}}.
> Allow passing custom RelBuilder into RelDecorrelator and
> RelStructuredTypeFlattener
> -----------------------------------------------------------------------------------
>
> Key: CALCITE-2201
> URL: https://issues.apache.org/jira/browse/CALCITE-2201
> Project: Calcite
> Issue Type: Task
> Reporter: Volodymyr Vysotskyi
> Assignee: Julian Hyde
> Priority: Major
>
> When {{RelDecorrelator.decorrelateQuery()}} method is called,
> {{RelDecorrelator}} instance with {{RelFactories.LOGICAL_BUILDER}} is
> created. We should modify this method to allow usage of custom {{RelBuilder}}.
> Also, {{RelStructuredTypeFlattener}} class should be modified in a similar
> way.
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