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Subject [GitHub] [flink] godfreyhe opened a new pull request #8520: [FLINK-12600] [table-planner-blink] Introduce planner rules to do deterministic rewriting on RelNode
Date Thu, 23 May 2019 09:49:08 GMT
godfreyhe opened a new pull request #8520: [FLINK-12600] [table-planner-blink] Introduce planner
rules to do deterministic rewriting on RelNode
URL: https://github.com/apache/flink/pull/8520
 
 
   
   ## What is the purpose of the change
   
   *Introduce planner rules to do deterministic rewriting on RelNode*
   
   
   ## Brief change log
   
     - * FlinkLimit0RemoveRule, that rewrites `limit 0` to empty Values*
     - *FlinkRewriteSubQueryRule, that rewrites a Filter with condition: `(select count from
T) > 0` to a Filter with condition: `exists(select * from T)`, which could be converted
to SEMI Join by FlinkSubQueryRemoveRule*
     - *ReplaceIntersectWithSemiJoinRule, that rewrites distinct Intersect to a distinct Aggregate
on a SEMI Join*
     - *ReplaceMinusWithAntiJoinRule, that rewrites distinct Minus to a distinct Aggregate
on an ANTI Join*
     - *introduce FlinkPruneEmptyRules#JOIN_RIGHT_INSTANCE to handle ANTI join with empty
right*
   
   
   ## Verifying this change
   
   This change added tests and can be verified as follows:
   
     - *Added FlinkLimit0RemoveRuleTest that validates the logical plan result after FlinkLimit0RemoveRule
is applied, and added Limit0RemoveITCase that validates the execution result*
     - *Added FlinkRewriteSubQueryRuleTest that validates the logical plan results after FlinkRewriteSubQueryRule
is applied*
     - *Added ReplaceIntersectWithSemiJoinRuleTest that validates the logical plan results
after ReplaceIntersectWithSemiJoinRule is applied*
     - *Added ReplaceMinusWithAntiJoinRuleTest that validates the logical plan results after
ReplaceMinusWithAntiJoinRule is applied*
     - *Added FlinkPruneEmptyRulesTest that validates the logical plan results after FlinkPruneEmptyRules
is applied*
     - *Added SetOperatorsTest that validates the physical plan results after ReplaceMinusWithAntiJoinRule
and ReplaceIntersectWithSemiJoinRuleTest are applied*
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): (yes / **no**)
     - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (yes
/ **no**)
     - The serializers: (yes / **no** / don't know)
     - The runtime per-record code paths (performance sensitive): (yes / **no** / don't know)
     - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing,
Yarn/Mesos, ZooKeeper: (yes / **no** / don't know)
     - The S3 file system connector: (yes / **no** / don't know)
   
   ## Documentation
   
     - Does this pull request introduce a new feature? (yes / **no**)
     - If yes, how is the feature documented? (not applicable / docs / JavaDocs / **not documented**)
   

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