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https://issues.apache.org/jira/browse/CALCITE-2314?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julian Hyde resolved CALCITE-2314.
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Resolution: Fixed
Fix Version/s: 1.17.0
Fixed in
[6fe55e3e|http://git-wip-us.apache.org/repos/asf/calcite/commit/6fe55e3e];
thanks for the help fixing {{RexInterpreter}}, [~kgyrtkirk]!
> Verify RexNode transformations by evaluating before and after expressions
> against sample values
> -----------------------------------------------------------------------------------------------
>
> Key: CALCITE-2314
> URL: https://issues.apache.org/jira/browse/CALCITE-2314
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Assignee: Julian Hyde
> Priority: Major
> Fix For: 1.17.0
>
>
> Verify transformations of {{RexNode}} expressions (such as simplification,
> see {{class RexSimplify}}) by evaluating before and after expressions against
> sample values.
> Given an expression, say {{($0 < $1) IS NOT NULL}} we can bind $0 and $1 to
> values (0, 1, null) and evaluate the 9 combinations. We can also evaluate the
> simplified expression {{$0 IS NOT NULL AND $1 IS NOT NULL}} and see whether
> it gives the same value for each of the combinations.
> We can add this checking to existing tests with little effort. It will
> improve confidence that we handle 3-valued logic correctly.
> As part of this task, we will create an interpreter {{class RexInterpreter}}
> that evaluates RexNode expressions for common operators without generating
> code. It is not very efficient and does not cover very many types, functions
> and operators, but should be easy for people to extend to add a few more.
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