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https://issues.apache.org/jira/browse/FLINK-12487?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kurt Young closed FLINK-12487.
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Resolution: Implemented
Fix Version/s: 1.9.0
merge in 1.9.0: b47b5910c16a423504171a2a29230ff1d8966214
> Introduce planner rules to rewrite expression and merge calc
> ------------------------------------------------------------
>
> Key: FLINK-12487
> URL: https://issues.apache.org/jira/browse/FLINK-12487
> Project: Flink
> Issue Type: New Feature
> Components: Table SQL / Planner
> Reporter: godfrey he
> Assignee: godfrey he
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.9.0
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> This issue aims to introduce planner rules to rewrite expression and merge
> calc, rules include:
> 1. {{ConvertToNotInOrInRule}}, that converts a cascade of predicates to
> {{IN}} or {{NOT_IN}},
> e.g.
> converts predicate {{(x = 1 OR x = 2 OR x = 3 OR x = 4) AND y = 5}} to
> predicate {{x IN (1, 2, 3, 4) AND y = 5}}
> converts predicate {{(x <> 1 AND x <> 2 AND x <> 3 AND x <> 4) AND y = 5}}
> to predicate {{x NOT IN (1, 2, 3, 4) AND y = 5}}
> 2. {{RewriteCoalesceRule}}, that rewrites {{Coalesce}} to {{Case When}}
> 3. {{FlinkCalcMergeRule}}, that is copied from Calcite {{CalcMergeRule}}, and
> it will simplify the merged program
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