[ https://issues.apache.org/jira/browse/CALCITE-6920 ]
Mihai Budiu deleted comment on CALCITE-6920:
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was (Author: JIRAUSER295926):
This is related to https://issues.apache.org/jira/browse/CALCITE-6058
> The type derived for a cast to INT ARRAY always has non-nullable elements
> -------------------------------------------------------------------------
>
> Key: CALCITE-6920
> URL: https://issues.apache.org/jira/browse/CALCITE-6920
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.39.0
> Reporter: Mihai Budiu
> Assignee: Mihai Budiu
> Priority: Minor
> Labels: pull-request-available
> Fix For: 1.40.0
>
>
> Consider an expression such as SELECT CAST(variant AS INT ARRAY).
> The type inference produces a type of INTEGER NOT NULL ARRAY.
> This is incorrect, since the elements of the array could be nulls.
> This happens because SqlCollectionTypeNameSpec.deriveType never produces
> nullable types for collection elements.
> Notice that one cannot write INT NULL ARRAY or INT NOT NULL ARRAY.
> A conservative implementation should always produce a nullable element type.
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