godfrey he created FLINK-20490:
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Summary: Don't share inputs between FlinkPhysicalRel and ExecNode
Key: FLINK-20490
URL: https://issues.apache.org/jira/browse/FLINK-20490
Project: Flink
Issue Type: Sub-task
Components: Table SQL / Planner
Reporter: godfrey he
Currently, all execution nodes extend both from {{RelNode}} and {{ExecNode}},
and they share same input instances which is stored in the {{RelNode}}
instance. {{ExecNode#getInputNodes}} just returns the casted {{RelNode}}
inputs, code likes:
{code:java}
getInputs.map(_.asInstanceOf[ExecNode[_]])
{code}
This issue aim to let {{ExecNode}} have its own input instance. It is prepared
for the implementation separation between {{RelNode}} and {{ExecNode}}.
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