[
https://issues.apache.org/jira/browse/CALCITE-5109?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17528800#comment-17528800
]
Xurenhe commented on CALCITE-5109:
----------------------------------
Hi all
Please review the commit:
[https://github.com/wojustme/calcite/commit/84ab389abc68313d8ddabd065ddfb2228eb8242b]
It's a rough draft, please give me some advices.
> 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
>
>
> {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*
>
--
This message was sent by Atlassian Jira
(v8.20.7#820007)
