Julian Hyde created CALCITE-2604:
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Summary: 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
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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