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https://issues.apache.org/jira/browse/CALCITE-4999?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17567108#comment-17567108
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Dmitry Sysolyatin commented on CALCITE-4999:
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[~julianhyde] It does not work, but it can be fixed -
[https://github.com/apache/calcite/commit/f656fd4ffaad9a6419c0d8a01876e9ca234c7a22]
But I would like to not merge this fix in scope of this task. It would be
better to do it inside
[https://issues.apache.org/jira/projects/CALCITE/issues/CALCITE-5126]
> ARRAY, MULTISET functions should return a collection of scalars if a
> sub-query returns 1 column
> -----------------------------------------------------------------------------------------------
>
> Key: CALCITE-4999
> URL: https://issues.apache.org/jira/browse/CALCITE-4999
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Dmitry Sysolyatin
> Assignee: Dmitry Sysolyatin
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1h
> Remaining Estimate: 0h
>
> At the moment `array` function returns [RecordType ARRAY] if subquery is
> passed like an argument.
> {code:java}
> SELECT array(select 'toast.' || x from unnest(ARRAY['1','2']) x){code}
> But Sql standard says:
> {code:java}
> 6.38 <array value constructor>
> Function
> Specify construction of an array.
> Format
> <array value constructor> ::=
> <array value constructor by enumeration>
> | <array value constructor by query>
> [...]
> <array value constructor by query> ::=
> ARRAY <table subquery>
> Syntax Rules
> [...]
> 3) If <array value constructor by query> is specified, then
> a) The <query expression> QE simply contained in the <table subquery> shall
> be of degree 1 (one). Let ET be the declared type of the column in the result
> of <query expression>.
> b) The declared type of the <array value constructor by query> is array with
> element type ET and maximum cardinality equal to the implementation-defined
> maximum cardinality IMDC for such array types.
> {code}
> Proposed solution is to return an array of scalars (e.g. INTEGER ARRAY) when
> the query returns 1 column, and continue to return an array of ROW when the
> query has 2 or more columns. And do the same for MULTISET.
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