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https://issues.apache.org/jira/browse/CALCITE-4999?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17493206#comment-17493206
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Ruben Q L commented on CALCITE-4999:
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[~dmsysolyatin] you can find some draft versions of the standard in Wikipedia:
https://en.wikipedia.org/wiki/SQL#SQL_standards_documents
I have checked the standard (relevant parts: <array value constructor> and
<array value constructor by query>); and it would seem that, indeed, Calcite is
not following it:
{noformat}
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.
{noformat}
> `least restrictive` type inference does not work when one operand is scalar
> and another is row with one field
> -------------------------------------------------------------------------------------------------------------
>
> 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: 0.5h
> Remaining Estimate: 0h
>
> I faced with a issue that the following query:
> {code:java}
> SELECT ARRAY_CONCAT(ARRAY['1', '2'], array(select 'toast.' || x from
> unnest(ARRAY['1','2']) x)) {code}
> didn't work, because of:
> {code:java}
> java.lang.IllegalArgumentException: Cannot infer return type for
> ARRAY_CONCAT; operand types: [CHAR(1) ARRAY, RecordType(CHAR(7) EXPR$0)
> ARRAY]{code}
> `least restrictive` type inference does not work when one operand is scalar
> and another is row with one field
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