hequn8128 commented on a change in pull request #8087: [FLINK-12029][table] Add
column operations for TableApi
URL: https://github.com/apache/flink/pull/8087#discussion_r274779381
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File path:
flink-table/flink-table-planner/src/main/scala/org/apache/flink/table/expressions/PlannerExpressionConverter.scala
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@@ -94,6 +94,12 @@ class PlannerExpressionConverter private extends
ApiExpressionVisitor[PlannerExp
case AS =>
assert(args.size >= 2)
+ args.drop(1).foreach {
Review comment:
Ok, I validate it to check the invalid expression such as `columns(1 to 2)
as 'a`. I think you make a good point here, it's not good to valid in
`PlannerExpressionConverter`. Maybe we need to validate it in Column Expander
Rule?
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