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https://issues.apache.org/jira/browse/FLINK-19362?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17200100#comment-17200100
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hailong wang commented on FLINK-19362:
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Correct me if I am wrong, Thanks.
> 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
> Priority: Major
> 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. 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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