[jira] [Created] (CALCITE-2862) Deprecated ExprSimplifier causes some operands not being simplified

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

Rong Rong created CALCITE-2862:
----------------------------------

             Summary: Deprecated ExprSimplifier causes some operands not being simplified
                 Key: CALCITE-2862
                 URL: https://issues.apache.org/jira/browse/CALCITE-2862
             Project: Calcite
          Issue Type: Bug
          Components: core
            Reporter: Rong Rong


This might not be a bug or the original intention of CALCITE-2726 since it is not part of the [PR|https://github.com/apache/calcite/pull/956/files]. 
 The reduction of ExprSimplifier (RexShuttle) actually causes some of the chained operations not being simplified. For example:
{code:java}
AS(
  +(
    someAggFunc($2, $0), 
    CAST(1):BIGINT NOT NULL
    ),
  someName'
)
{code}
Somehow did not get simplified. My initial feeling is that {{AS}} is not one of the kinds in the case-switch code in RexSimplify. 



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