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https://issues.apache.org/jira/browse/FLINK-31908?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17715705#comment-17715705
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jackylau commented on FLINK-31908:
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cast only make type take effective. and nullable should be use original expr's
nullable.
> cast expr to type with not null should not change nullable of expr
> -------------------------------------------------------------------
>
> Key: FLINK-31908
> URL: https://issues.apache.org/jira/browse/FLINK-31908
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / API
> Affects Versions: 1.18.0
> Reporter: jackylau
> Priority: Major
>
> {code:java}
> Stream<TestSetSpec> getTestSetSpecs() {
> return Stream.of(
> TestSetSpec.forFunction(BuiltInFunctionDefinitions.CAST)
> .onFieldsWithData(new Integer[]{1, 2}, 3)
> .andDataTypes(DataTypes.ARRAY(INT()), INT())
> .testSqlResult(
> "CAST(f0 AS ARRAY<DOUBLE NOT NULL>)",
> new Double[]{1.0d, 2.0d},
> DataTypes.ARRAY(DOUBLE().notNull())));
> } {code}
> but the result type should DataTypes.ARRAY(DOUBLE())), the root cause is
> calcite bug
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