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https://issues.apache.org/jira/browse/CALCITE-3409?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17224883#comment-17224883
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Jesus Camacho Rodriguez commented on CALCITE-3409:
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[~julianhyde], thanks for pinging me. I have not used the unification rules
that heavily, and the change does not seem to affect other materialization
rules. I have left a couple of comments in the PR though.
> Add an interface in MaterializedViewSubstitutionVisitor to allow registering
> UnifyRule
> --------------------------------------------------------------------------------------
>
> Key: CALCITE-3409
> URL: https://issues.apache.org/jira/browse/CALCITE-3409
> Project: Calcite
> Issue Type: Improvement
> Reporter: Jin Xing
> Assignee: Jin Xing
> Priority: Major
> Labels: pull-request-available
> Time Spent: 4h 20m
> Remaining Estimate: 0h
>
> In current code of MaterializedViewSubstitutionVisitor, all matching rules
> are internal defined. The existing rules support the most popular scenarios.
> But my customers sometimes ask for the ability to self define some matching
> rules, thus to support some special scenarios.
> I take below example as an illustration:
> {code:java}
> Query:
> select * from table
> where from_unixtime(_EVENT_TIME_, "yyyymmdd hh") >= "20190909 00"
> and from_unixtime(_EVENT_TIME_, "yyyymmdd hh") <= "20190909 23" ;
> Materialized View:
> select * from table
> where from_unixtime(_EVENT_TIME_, "yyyymmdd") = "20190909";{code}
> It's hard to enumerate the matching pattern for different functions in
> internal matching rules. We can expose a method to register new UnifyRules
> and allow user to extend the ability of MV matching
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