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Subject [GitHub] [flink] JingsongLi opened a new pull request #7961: [FLINK-11882][table-runtime-blink] Introduce BytesHashMap to batch hash agg
Date Tue, 12 Mar 2019 08:00:14 GMT
JingsongLi opened a new pull request #7961: [FLINK-11882][table-runtime-blink] Introduce BytesHashMap
to batch hash agg
URL: https://github.com/apache/flink/pull/7961
 
 
   ## What is the purpose of the change
   
   Introduce bytes based hash table.
   It can be used for performing aggregations where the aggregated values are fixed-width.
   Because the data is stored in continuous memory, AggBuffer of variable length cannot be
applied to this HashMap. The KeyValue form in hash map is designed to reduce the cost of key
fetching in lookup.
   
   Add a test to do a complete hash agg. When HashMap has enough memory, pure hash AGG is
performed; when memory is insufficient, it degenerates into sort agg.
   
   ## Verifying this change
   
   ut & coverage
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): (yes, just add test dependency)
     - 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? (yes)
     - If yes, how is the feature documented? (JavaDocs)
   

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