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https://issues.apache.org/jira/browse/CALCITE-5674?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17717854#comment-17717854
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Julian Hyde commented on CALCITE-5674:
--------------------------------------
[~jackylau], Can you change the summary to something suitable for the release
notes; that is, start with a capital letter.
[~libenchao]'s question is the key one. What is (and should be) the type of
{{array[1,null,2]}}?
> cast expr to target type should respect nullable when the type is array
> -----------------------------------------------------------------------
>
> Key: CALCITE-5674
> URL: https://issues.apache.org/jira/browse/CALCITE-5674
> Project: Calcite
> Issue Type: Improvement
> Affects Versions: 1.35.0
> Reporter: jackylau
> Priority: Major
> Fix For: 1.35.0
>
>
> {code:java}
> // code placeholder
>
> // code placeholder
> sql("select cast(array[1,null,2] as int array) from (values (1))")
> .columnType("INTEGER NOT NULL ARRAY NOT NULL");
> it is not correct, it should return INTEGER ARRAY NOT NULL {code}
>
> according the sql standard, cast to type, which can not be nulable and
> nullable is tabel level attribute which can not changed by cast.
> current the calcite cast will using nullable of expr to replace target type ,
> it is true. but it shoud also set array element type
> {code:java}
> // code placeholder
> /** Derives the type of "CAST(expression AS targetType)". */
> public static RelDataType deriveType(RelDataTypeFactory typeFactory,
> RelDataType expressionType, RelDataType targetType, boolean safe) {
> return typeFactory.createTypeWithNullability(targetType,
> expressionType.isNullable() || safe);
> } {code}
>
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