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https://issues.apache.org/jira/browse/CALCITE-3972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17101205#comment-17101205
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Julian Hyde commented on CALCITE-3972:
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RelBuilder isn't just used in rules. It is used for larger tasks, like
SqlToRelConverter. And it is the recommended translator if someone has built a
front end based on their own query language. We want RelBuilder's lifecycle to
be simple and predictable when translating a complex query into dozens or
hundreds of RelNodes. There might be multiple conventions in such queries.
> Allow RelBuilder to create RelNode with convention and use it for trait
> convert
> -------------------------------------------------------------------------------
>
> Key: CALCITE-3972
> URL: https://issues.apache.org/jira/browse/CALCITE-3972
> Project: Calcite
> Issue Type: Bug
> Reporter: Xiening Dai
> Assignee: Xiening Dai
> Priority: Major
> Fix For: 1.23.0
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> 1. Provide Convention.transformRelBuilder() to transform an existing
> RelBuilder into one with specific convention.
> 2. RelBuilder provides withRelFactories() method to allow caller swap the
> underlying RelFactories and create a new builder.
> 3. Use the new interface in RelCollationTraitDef for converting into
> RelCollation traits
> We can avoid ~1/3 of total rule firings in a N way join case with this change.
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