Feng Jin created FLINK-34312:
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Summary: Improve the handling of default node types when using
named parameters.
Key: FLINK-34312
URL: https://issues.apache.org/jira/browse/FLINK-34312
Project: Flink
Issue Type: Sub-task
Reporter: Feng Jin
Currently, we have supported the use of named parameters with optional
arguments.
By adapting the interface of Calcite, we can fill in the default operator when
a parameter is missing. Whether it is during the validation phase or when
converting to SqlToRel phase, we need to handle it specially by modifying the
return type of DEFAULT operator based on the argument type of the operator.
We have multiple places that need to handle the type of DEFAULT operator,
including SqlCallBinding, SqlOperatorBinding, and SqlToRelConverter.
The improved solution is as follows:
Before SqlToRel, we can construct a DEFAULT node with a return type that
matches the argument type. This way, during the SqlToRel phase, there is no
need for special handling of the DEFAULT node's type.
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