dalongliu created FLINK-26929:
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             Summary: Introduce adaptive hash join for batch sql optimization
                 Key: FLINK-26929
                 URL: https://issues.apache.org/jira/browse/FLINK-26929
             Project: Flink
          Issue Type: New Feature
          Components: Table SQL / Runtime
            Reporter: dalongliu
             Fix For: 1.16.0


We propose an optimization method adaptive hash join for the batch join 
scenario, hoping to integrate the advantages of sorted-merge join and hash join 
according to the characteristics of runtime data. The adaptive hash join will 
try to use hash join firstly, if it failed, will fallback to sort merge join.



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