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https://issues.apache.org/jira/browse/CALCITE-2649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16670324#comment-16670324
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Julian Hyde commented on CALCITE-2649:
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Can you explain your use case where you need to know the stack depth?
If I’m creating an ON condition for a join, I know that I’m about to pop 2
items off the stack, and therefore create field references accordingly.
I care that the stack depth is at least 2, but I don’t care whether it is 2 or
1000. I feel that a stack not a list is the right abstraction because behavior
is always relative to the top of the stack.
There is already a variant of the field method that can look several places
down the stack.
> Allow RelBuilder to create field references to aliased relations without
> knowing the size of the stack
> ------------------------------------------------------------------------------------------------------
>
> Key: CALCITE-2649
> URL: https://issues.apache.org/jira/browse/CALCITE-2649
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.17.0
> Reporter: Stamatis Zampetakis
> Assignee: Julian Hyde
> Priority: Minor
> Labels: beginner, newbie
> Fix For: 1.18.0
>
>
> As of [CALCITE-1523|https://issues.apache.org/jira/browse/CALCITE-1523] it is
> possible to create field references to aliased relations anywhere in the
> stack. However the respective field method requires to pass as a parameter
> the inputCount (i.e., size of the stack). This is not very convenient since
> clients of RelBuilder are obliged to track the size of the stack (leading to
> the uneseccary creation of Wrapper classes).
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