[jira] [Commented] (CALCITE-2645) SESSION_END() is transformed to RexInputRef, which is always equal to SESSION_START()

["Rui Wang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-2645?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16666716#comment-16666716 ] 

Rui Wang commented on CALCITE-2645:
-----------------------------------

cc [~kenn]

> 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
>            Priority: Major
>
> https://github.com/apache/calcite/blob/master/core/src/main/java/org/apache/calcite/sql2rel/AuxiliaryConverter.java#L56
> 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 it cannot be differentiated which RexInputRef is session start, and which RexInputRef is session end. 
> 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 correct input reference to GROUP BY's field.



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