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https://issues.apache.org/jira/browse/CALCITE-3928?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17084527#comment-17084527
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Danny Chen commented on CALCITE-3928:
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The title is really hard to understand, maybe we can try to describe in the SQL
way, use the SQL keywords.
> Canonicalization doesn't do field trimming before materialized view matching
> ----------------------------------------------------------------------------
>
> Key: CALCITE-3928
> URL: https://issues.apache.org/jira/browse/CALCITE-3928
> Project: Calcite
> Issue Type: Bug
> Reporter: Jin Xing
> Priority: Major
>
> If we have query and materialized view as below:
> {code:java}
> query:
> LogicalAggregate(group=[{0}], EXPR$1=[afunc($1, $1)])
> LogicalProject(a=$0, b=[bfunc($1)])
> LogicalTableScan(table=[[default, user_table]])
> mv:
> LogicalAggregate(group=[{0}], EXPR$1=[afunc($1, $2)])
> LogicalProject(a=$0, b=[bfunc($1)], c=[bfunc($1)])
> LogicalTableScan(table=[[default, user_table]])
> {code}
> The semantics of query and mv logic are the same. Materialized view matching
> failed, because field trimming is not done when canonicalizing the plans.
> Currently Calcite does field trimming when convert sql to rel. But my
> company's internal system does materialization detection – – generates &
> transforms & stores the RelNode.
> Shall we add the field trimming when canonicalizing materialized view logic?
>
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