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https://issues.apache.org/jira/browse/CALCITE-5109?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17529439#comment-17529439
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Xurenhe commented on CALCITE-5109:
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Hi [~Chunwei Lei]
I made a
[PR|[https://github.com/apache/calcite/pull/2783]|https://github.com/apache/calcite/pull/2783],]
Please review it, thanks
> RelMdAllPredicates support to analyze left-out-join
> ---------------------------------------------------
>
> Key: CALCITE-5109
> URL: https://issues.apache.org/jira/browse/CALCITE-5109
> Project: Calcite
> Issue Type: Wish
> Components: core
> Reporter: Xurenhe
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
>
> {code:java}
> select * from
> left_sub_query {left_where_condition}
> join {join_type}
> right_sub_query {right_where_condition}
> on {on_condition}
> where {where_condition}{code}
>
> As we know:
> * join_type is {*}left out join{*}:
> ** *left_where_condition* could be pulled to *where_condition*
> ** *right_where_condition* could be pulled to *on_condition*
> * join_type is *right out join:*
> ** *left_where_condition* could be pulled to *on_condition*
> ** *right_where_condition* could be pulled to *where_condition*
> ----
> There are a large number of star-model in the warehouse. Rewriting query by
> materialized view is a very effective way to speed up query.
>
> I'm expanding [*MaterializedViewRule#perform*|#L175]]to support rewriting
> query when meeting left-out-join, and found that
> [*RelMdAllPredicates*|#L193]] didn't support to analyze left-join.
> Could calcite support it? This feature is very important for expanding
> *MaterializedViewRule#perform*
>
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