Mihai Budiu created CALCITE-7834:
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Summary: Type inferred for LAG/LEAD is not always nullable
Key: CALCITE-7834
URL: https://issues.apache.org/jira/browse/CALCITE-7834
Project: Calcite
Issue Type: Bug
Components: core
Affects Versions: 1.42.0
Reporter: Mihai Budiu
Assignee: Mihai Budiu
The column produced by LAG/LEAD should always be nullable, but Calcite copies
the input column type. As a result, the following quidem test crashes:
{code:java}
SELECT y, x, LAG(x, 1, 0) OVER (ORDER BY y) AS l
FROM (VALUES (1, 10), (2, CAST(NULL AS INTEGER)), (3, 30)) AS t(y, x); {code}
stack trace:
{code:java}
Caused by: org.apache.calcite.runtime.CalciteException: Cannot convert null to
int
at
java.base/jdk.internal.reflect.DirectConstructorHandleAccessor.newInstance(DirectConstructorHandleAccessor.java:67)
at
java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500)
at
java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:484)
at
org.apache.calcite.runtime.Resources$ExInstWithCause.ex(Resources.java:511)
at org.apache.calcite.runtime.Resources$ExInst.ex(Resources.java:605)
at
org.apache.calcite.runtime.SqlFunctions.cannotConvert(SqlFunctions.java:5283)
at org.apache.calcite.runtime.SqlFunctions.toInt(SqlFunctions.java:5464)
{code}
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