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https://issues.apache.org/jira/browse/CALCITE-2604?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julian Hyde resolved CALCITE-2604.
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Resolution: Fixed
Fix Version/s: 1.18.0
Fixed in
[6b3844c0|http://git-wip-us.apache.org/repos/asf/calcite/commit/6b3844c0].
> When simplifying an expression, say whether an UNKNOWN value will be
> interpreted as is, or as TRUE or FALSE
> -----------------------------------------------------------------------------------------------------------
>
> Key: CALCITE-2604
> URL: https://issues.apache.org/jira/browse/CALCITE-2604
> Project: Calcite
> Issue Type: Task
> Reporter: Julian Hyde
> Assignee: Julian Hyde
> Priority: Major
> Fix For: 1.18.0
>
>
> When simplifying an expression, say whether an UNKNOWN value will be
> interpreted as is, or as true or false. Concretely, this means adding an
> {{enum RexUnknownAs}} with values {{TRUE}}, {{FALSE}}, {{UNKNOWN}}, and
> adding it as an argument to {{RexSimplify.simplify}} and similar methods.
> Currently {{RexSimplify}} has a constant field {{boolean unknownAs}} but this
> is a mistake: the handling of unknown must change as you recurse into the
> tree. For example, if an {{UNKNOWN}} result of {{NOT x}} is interpreted as
> {{FALSE}}, then an {{UNKNOWN}} result of {{x}} must be interpreted as
> {{TRUE}}.
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