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https://issues.apache.org/jira/browse/FLINK-4549?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15516448#comment-15516448
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ASF GitHub Bot commented on FLINK-4549:
---------------------------------------
Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/2500#discussion_r80237743
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/codegen/CodeGenerator.scala
---
@@ -545,7 +545,9 @@ class CodeGenerator(
generateInputAccess(input._1, input._2, index)
}
- override def visitFieldAccess(rexFieldAccess: RexFieldAccess):
GeneratedExpression = ???
+ override def visitFieldAccess(rexFieldAccess: RexFieldAccess):
GeneratedExpression =
+ throw new CodeGenException("The 'FieldAccess' feature is currently not
supported.")
--- End diff --
This error message might not be very helpful. It does not tell a user what
caused the problem and how it can be fixed. Would `"Nested field access is not
support yet"` be better?
> Test and document implicitly supported SQL functions
> ----------------------------------------------------
>
> Key: FLINK-4549
> URL: https://issues.apache.org/jira/browse/FLINK-4549
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Reporter: Timo Walther
> Assignee: Timo Walther
>
> Calcite supports many SQL functions by translating them into {{RexNode}} s.
> However, SQL functions like {{NULLIF}}, {{OVERLAPS}} are neither tested nor
> document although supported.
> These functions should be tested and added to the documentation. We could
> adopt parts from the Calcite documentation.
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