[jira] [Closed] (CALCITE-783) Infer collation of Project using monotonicity

["Jacques Nadeau (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CALCITE-783?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jacques Nadeau closed CALCITE-783.
----------------------------------

Resolved in release 1.4.0-incubating (2015-08-23)

> Infer collation of Project using monotonicity
> ---------------------------------------------
>
>                 Key: CALCITE-783
>                 URL: https://issues.apache.org/jira/browse/CALCITE-783
>             Project: Calcite
>          Issue Type: Bug
>          Components: core
>            Reporter: Milinda Lakmal Pathirage
>            Assignee: Julian Hyde
>             Fix For: 1.4.0-incubating
>
>         Attachments: CALCITE-783-0.patch, CALCITE-783-1.patch
>
>
> Current implementation of RelMdCollation#project doesn't handle function expressions and because of that we loose any collation metadata related to monotonic expressions which can be useful for generating streaming query execution plans involving tumbling windows.
> Following is how current code looks like (RelMdCollation):
> 185: for (Ord<RexNode> project : Ord.zip(projects)) {
> 186:       if (project.e instanceof RexInputRef) {
> 187:         targets.put(((RexInputRef) project.e).getIndex(), project.i);
> 188:       } 
> 189: }
> We only handle projects of type RexInputRef. But to support monotonic expressions we should laso handle projects of type RexCall.



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