[jira] [Created] (FLINK-31908) cast expr to type with not null should not change nullable of expr

[jackylau (Jira)]

jackylau created FLINK-31908:
--------------------------------

             Summary: 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
    Affects Versions: 1.18.0
            Reporter: jackylau


{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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