Yash Mayya created CALCITE-6648:
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Summary: IGNORE NULLS / RESPECT NULLS window function option can
result in a type validation error in SqlToRelConverter
Key: CALCITE-6648
URL: https://issues.apache.org/jira/browse/CALCITE-6648
Project: Calcite
Issue Type: Bug
Components: core
Reporter: Yash Mayya
If the {{IGNORE NULLS}} / {{RESPECT NULLS}} window function option is used when
the input to the window function is a non-nullable type and the window frame is
of type {{ROWS}} with an offset based lower or upper bound (i.e., {{{}n
PRECEDING / FOLLOWING){}}}, this results in an error
[here|https://github.com/apache/calcite/blob/9b4eff06d6a16b3013f01d5fe4bceeaff6822603/core/src/main/java/org/apache/calcite/sql2rel/SqlToRelConverter.java#L514-L524]
- the inferred return type for the window function from the parsed {{SqlNode}}
is a non-nullable type but the converted type is nullable (which makes sense
since the result should be {{null}} for rows where the window frame is "out of
bounds").
This issue does not occur if any of the following conditions are true:
* {{IGNORE NULLS}} / {{RESPECT NULLS}} options are not specified because in
this case the inferred return type for the window function call in the parsed
{{SqlNode}} is also a nullable type.
* The input to the window function is a nullable type.
* The window frame is of type {{ROWS}} but both the bounds are UNBOUNDED
PRECEDING / CURRENT ROW / UNBOUNDED FOLLOWING.
* The window frame is of type {{{}RANGE{}}}.
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