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https://issues.apache.org/jira/browse/FLINK-12509?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated FLINK-12509:
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Labels: pull-request-available (was: )
> Introduce planner rules about non semi/anti join
> ------------------------------------------------
>
> Key: FLINK-12509
> URL: https://issues.apache.org/jira/browse/FLINK-12509
> Project: Flink
> Issue Type: New Feature
> Components: Table SQL / Planner
> Reporter: godfrey he
> Assignee: godfrey he
> Priority: Major
> Labels: pull-request-available
>
> This issue aims to introduce planner rules about non semi/anti join, rules
> include:
> 1. {{JoinConditionEqualityTransferRule}}, that converts Join's conditions to
> the left or right table's own independent filter as much as possible, so that
> the rules of filter-push-down can push down the filter to below.
> 2. {{JoinConditionTypeCoerceRule}}, that coerces the both sides of
> EQUALS(`=`) operator in Join condition to the same type while sans
> nullability.
> 3. {{JoinDependentConditionPushDownRule}}, that extracts some sub-conditions
> in the Join OR condition that can be pushed into join inputs by
> {{FlinkFilterJoinRule}}.
> 4. {{JoinDeriveNullFilterRule}} filters null values before join if the count
> null value from join input
> is greater than {{sql.optimizer.join.null.filter.threshold}}
> 5. {{SimplifyJoinConditionRule}}, that apply various simplifying
> transformations on join condition.
> planner rules about semi/anti join will be introduced in another issue.
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