godfrey he created FLINK-15004:
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Summary: Choose SortMergeJoin instead of HashJoin if the
statistics is unknown
Key: FLINK-15004
URL: https://issues.apache.org/jira/browse/FLINK-15004
Project: Flink
Issue Type: Sub-task
Components: Table SQL / Planner
Affects Versions: 1.9.1, 1.9.0
Reporter: godfrey he
Fix For: 1.10.0
Currently, blink planner will use default rowCount value (defined in
{{FlinkPreparingTableBase#DEFAULT_ROWCOUNT}} ) when the statistics is unknown,
and maybe choose {{HashJoin}} instead of {{SortMergeJoin}}. The job will hang
if the build side has huge input size. So It's better to use {{SortMergeJoin}}
for execution stability if the statistics is unknown.
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