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https://issues.apache.org/jira/browse/CALCITE-2092?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16296605#comment-16296605
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Volodymyr Vysotskyi commented on CALCITE-2092:
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The reason for these changes is the same as in CALCITE-2043 - in Drill, we need
to use our {{RelBuilder}} implementation with overridden {{empty()}} method.
> Allow passing custom RelBuilder into SqlToRelConverter
> ------------------------------------------------------
>
> Key: CALCITE-2092
> URL: https://issues.apache.org/jira/browse/CALCITE-2092
> Project: Calcite
> Issue Type: Bug
> Reporter: Volodymyr Vysotskyi
> Assignee: Julian Hyde
>
> Currently, {{SqlToRelConverter}} uses {{RelBuilder}} which was created in
> such a way:
> {code:java}
> RelFactories.LOGICAL_BUILDER.create(cluster, null)
> {code}
> So it is not possible to use custom {{RelBuilder}} in this class.
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