[GitHub] [flink] godfreyhe opened a new pull request #8411: [FLINK-12487] [table-planner-blink] Introduce planner rules to rewrite expression and merge calc

[GitBox <gi...@apache.org>]

godfreyhe opened a new pull request #8411: [FLINK-12487] [table-planner-blink] Introduce planner rules to rewrite expression and merge calc
URL: https://github.com/apache/flink/pull/8411
 
 
   
   
   ## What is the purpose of the change
   
   *Introduce planner rules to rewrite expression and merge calc*
   
   
   ## Brief change log
   
     - *added ConvertToNotInOrInRule to convert a cascade of predicates to IN or NOT_IN*
     - *added RewriteCoalesceRule to rewrite Coalesce to Case When*
     - *added FlinkCalcMergeRule to simplify the merged program*
   
   
   ## Verifying this change
   
   This change added tests and can be verified as follows:
   
   *(example:)*
      - *Added ConvertToNotInOrInRuleTest that validates the plan after ConvertToNotInOrInRule is applied*
     - *Added RewriteCoalesceRuleTest that validates the plan after RewriteCoalesceRule is applied*
      - *Added FlinkCalcMergeRuleTest that validates the plan after FlinkCalcMergeRule is applied*
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): (no)
     - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (no)
     - The serializers: (no)
     - The runtime per-record code paths (performance sensitive): (no)
     - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (no)
     - The S3 file system connector: (no)
   
   ## Documentation
   
     - Does this pull request introduce a new feature? (no)
     - If yes, how is the feature documented? (not documented)
   

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