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https://issues.apache.org/jira/browse/CALCITE-935?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julian Hyde updated CALCITE-935:
--------------------------------
Summary: Improve how ReduceExpressionsRule handles duplicate constraints
(was: Improve ReduceExpressionRule to deal with multiple "equals to literal" in
predicate)
> Improve how ReduceExpressionsRule handles duplicate constraints
> ---------------------------------------------------------------
>
> Key: CALCITE-935
> URL: https://issues.apache.org/jira/browse/CALCITE-935
> Project: Calcite
> Issue Type: Bug
> Reporter: Pengcheng Xiong
> Assignee: Julian Hyde
> Attachments: CALCITE-935.01.patch
>
>
> In ReduceExpressionRule.java,
> L396-397:
> final ImmutableMap<RexNode, RexLiteral> constants =
> predicateConstants(predicates);
> The query is "select * from src where (key='12' and key is
> null);" Here 'key' is a string type and it is one of the columns of 'src'
> table.
> Then we will have predicates [=($0, '12'), isnull($0)], which is the input of
> the
> predicateConstants, and the function will return "{$0='12'}"
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