[jira] [Created] (CALCITE-935) Improve ReduceExpressionRule to deal with multiple "equals to literal" in predicate

["Pengcheng Xiong (JIRA)" <ji...@apache.org>]

Pengcheng Xiong created CALCITE-935:
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             Summary: Improve ReduceExpressionRule to deal with multiple "equals to literal" in predicate
                 Key: CALCITE-935
                 URL: https://issues.apache.org/jira/browse/CALCITE-935
             Project: Calcite
          Issue Type: Bug
            Reporter: Pengcheng Xiong
            Assignee: Julian Hyde


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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