Rui Wang created CALCITE-2645:
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Summary: SESSION_END() is transformed to RexInputRef, which is
always equal to SESSION_START()
Key: CALCITE-2645
URL: https://issues.apache.org/jira/browse/CALCITE-2645
Project: Calcite
Issue Type: Bug
Reporter: Rui Wang
Assignee: Julian Hyde
https://github.com/apache/calcite/blob/master/core/src/main/java/org/apache/calcite/sql2rel/AuxiliaryConverter.java#L57
In the AuxiliaryConverter implementation, SESSION_END() is transformed to a
RexInputRef, as the same as SESSION_START(). By doing so, it cannot restored
when generating physical plan because which RexInputRef is start, and which
RexInputRef is end cannot be differentiated.
Ideally, during toRel, SESSION_END can be kept as a RexCall with function
information in it. So in the following step, the RexCall can be replaced as a
input reference.
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