[jira] [Created] (FLINK-14030) Nonequivalent conversion happens in Table planner

["Leonard Xu (Jira)" <ji...@apache.org>]

Leonard Xu created FLINK-14030:
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             Summary: Nonequivalent conversion happens in Table planner 
                 Key: FLINK-14030
                 URL: https://issues.apache.org/jira/browse/FLINK-14030
             Project: Flink
          Issue Type: Bug
          Components: Table SQL / Planner
    Affects Versions: 1.9.0
            Reporter: Leonard Xu
             Fix For: 2.0.0


~testAllApis()~ unit tests will run fail because planner make a conversion
from ~[ifThenElse(isNull(plus(f0, f1)), 'null', 'not null')]~
to ~[CASE(OR(IS NULL($0), IS NULL($1)), _UTF-16LE'null', _UTF-16LE'not null')]~
which is not a equivalence conversion. The result of expression 'f0 + 'f1  should be null
when the result overflows even if its two operands both are not null. 

It's easy to reproduce  as following:
 ^testAllApis(
     'f0 + 'f1,
     "f1 + f1",
     "f1 + f1",
     "null")// the result should be null because overflow

 override def testData: Row = {
    val testData = new Row(2)
    testData.setField(0, BigDecimal("1e10").bigDecimal)
    testData.setField(1, BigDecimal("0").bigDecimal)
    testData
  }
  
  override def typeInfo: RowTypeInfo = {
    new RowTypeInfo(
      /* 0 */ fromLogicalTypeToTypeInfo(DECIMAL(38, 10)),
      /* 1 */ fromLogicalTypeToTypeInfo(DECIMAL(38, 28)) 
    )
  }^





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