Mihai Budiu created CALCITE-6382:
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Summary: Type inference for SqlLeadLagAggFunction is incorrect
Key: CALCITE-6382
URL: https://issues.apache.org/jira/browse/CALCITE-6382
Project: Calcite
Issue Type: Bug
Components: core
Affects Versions: 1.36.0
Reporter: Mihai Budiu
Currently the LeadLag operator does not use the default value when inferring
the type of a column.
For the following example:
```
SELECT lead(c * 2, 1, -1.4) OVER (PARTITION BY x ORDER BY c) FROM t
```
The column 'c' has type INTEGER, and Calcite infers a type of INTEGER for the
result. However, the default value for the lead is -1.4, which is DECIMAL, so
the result type should be DECIMAL.
Currently Calcite only uses the nullability of the default value, but not its
type in the result type inference.
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