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https://issues.apache.org/jira/browse/CALCITE-2658?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16800082#comment-16800082
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Stamatis Zampetakis commented on CALCITE-2658:
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Hi [~Chunwei Lei], I still didn't find time to have a look on this sorry about
that. Since other people already had a look on this it might worth pinging them
directly. If nobody responds I will try to find some time to look on this.
Thanks for your patience and pushing this forward!
> Introducing more ReduceExpressionRules
> --------------------------------------
>
> Key: CALCITE-2658
> URL: https://issues.apache.org/jira/browse/CALCITE-2658
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Chunwei Lei
> Assignee: Chunwei Lei
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1h 40m
> Remaining Estimate: 0h
>
> It is useful to have rules reducing Exchange/Sort/SortExchange keys, e.g.,
> SELECT key,value FROM (SELECT 1 AS key, value FROM src) r DISTRIBUTE BY key;
> can be reduced to
> SELECT 1 AS key, value FROM src; # Since singleton requirement may already
> required by SELECT.
> SELECT key,value FROM (SELECT 1 AS key, value FROM src) r ORDER BY key;
> can be reduced to
> SELECT 1 AS key, value FROM src; # Since ordering on constant is useless.
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