Julian Hyde created CALCITE-1465:
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Summary: Store constants as a derived field in RelOptPredicateList
Key: CALCITE-1465
URL: https://issues.apache.org/jira/browse/CALCITE-1465
Project: Calcite
Issue Type: Bug
Reporter: Julian Hyde
Assignee: Julian Hyde
I propose that we compute predicate constants when we create a
{{RelOptPredicateList}}, and store them in an immutable field {{constantMap}}.
Currently, any rule that wishes to detect constants by aliasing (e.g. if we
know {{x = 5}} and {{x = y}} then we can deduce {{y = 5}}) must start with a
{{RelOptPredicateList}} (from the metadata supplier) and call the
{{ReduceExpressionsRule.predicateConstants}} method. This method is called many
times: in the current Calcite suite 1,201 instances of {{RelOptPredicateList}}
are created and {{predicateConstants}} is called 82,670 times.
Pre-computing would use a little extra memory but reduce the method calls by
~68x.
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