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https://issues.apache.org/jira/browse/CALCITE-856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14737353#comment-14737353
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Julian Hyde commented on CALCITE-856:
-------------------------------------
It would help a lot if all rules that create other relational expressions use a
RelBuilder, passed in a parameter to the rule's constructor. Then someone can
just create a new instance of the rule with a different RelBuilder. See
CALCITE-828.
> Make more rules extensible
> --------------------------
>
> Key: CALCITE-856
> URL: https://issues.apache.org/jira/browse/CALCITE-856
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
>
> Some rules are not extensible yet, thus they cannot be easily use by projects
> relying on Calcite e.g. AggregateProjectMergeRule or SortProjectTransposeRule.
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