[jira] [Created] (FLINK-19362) Remove confusing comment for `DOT` operator codegen

[Shang Yuanchun (Jira)]

hailong wang created FLINK-19362:
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             Summary: Remove confusing comment for `DOT` operator codegen
                 Key: FLINK-19362
                 URL: https://issues.apache.org/jira/browse/FLINK-19362
             Project: Flink
          Issue Type: Improvement
          Components: Table SQL / Planner
    Affects Versions: 1.11.0
            Reporter: hailong wang
             Fix For: 1.12.0


`DOT` operator codegen (ExprCodeGenerator#generateCallExpression) has comment as following:
{code:java}
// due to https://issues.apache.org/jira/browse/CALCITE-2162, expression such as
// "array[1].a.b" won't work now.
if (operands.size > 2) {
  throw new CodeGenException(
    "A DOT operator with more than 2 operands is not supported yet.")
}
{code}
But `array[1].a.b` actually can work for flink job. `DOT` will be transform to `RexFieldAccess` for [CALCITE-2542|https://issues.apache.org/jira/browse/CALCITE-2542]CALCITE-2542. And `generateDot` will never be invoked  except suppporting ITEM for ROW types.

Simply, I think we can only delete the comment which is confusing. 

 

 

 

 



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