[jira] [Created] (FLINK-17153) flink sql convert constant to char type cause loop

[xiaodao (Jira)]

xiaodao created FLINK-17153:
-------------------------------

             Summary: flink sql convert constant to char type cause loop 
                 Key: FLINK-17153
                 URL: https://issues.apache.org/jira/browse/FLINK-17153
             Project: Flink
          Issue Type: Bug
          Components: Table SQL / Planner
    Affects Versions: 1.9.1
            Reporter: xiaodao


sql:

SELECT
 '公开发债' AS secondary_business
FROM VarBondCode
WHERE stock_type = '77';

code is:

org.apache.flink.table.planner.codegen.CodeGeneratorContext#addReusableStringConstants

when it parse constant, it change to unicode, and str length is change, in this 
case secondary_business is char(4), and after  change it become 
'_UTF-16LE'\u516C\u5F00\u53D1\u503A''.

calcite call makecast func can't remove it,and call it loop;

org.apache.calcite.rex.RexBuilder#canRemoveCastFromLiteral

 

 



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