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https://issues.apache.org/jira/browse/CALCITE-2468?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16586722#comment-16586722
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Julian Hyde commented on CALCITE-2468:
--------------------------------------
I wonder whether RelStructuredTypeFlattener is to blame. Although the stack
trace in the Flink case indicates that it's still in the validator and has
probably not got to RelStructuredTypeFlattener yet.
> Validator throws IndexOutOfBoundsException when trying to infer operand type
> from struct return type
> ----------------------------------------------------------------------------------------------------
>
> Key: CALCITE-2468
> URL: https://issues.apache.org/jira/browse/CALCITE-2468
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.17.0
> Reporter: Rong Rong
> Assignee: Julian Hyde
> Priority: Major
>
> IOOBE was thrown when trying to acquire {{SqlOperandTypeInference}} using
> {{RETURN_TYPE}} at:
> https://github.com/apache/calcite/blob/branch-1.17/core/src/main/java/org/apache/calcite/sql/type/InferTypes.java#L68
> The follow SQLs demonstrates how to trigger the exception over a simple
> Schema:
> {code:yaml}
> - table1:
> - structType1:
> - intField
> - structType2:
> - intField
> - bigintField
> {code}
> - Exception SQL:
> {code:sql}
> SELECT structType1 AS myStructType FROM table1
> {code}
> - Correct SQL:
> {code:sql}
> SELECT structType1 FROM table1
> {code}
> {code:sql}
> SELECT structType2 AS myStructType FROM table1
> {code}
> E2E example can be found in:
> https://github.com/apache/calcite/commit/d5fb1f9fc5d3f9583128d9ee35c4a23e8470d54d
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