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https://issues.apache.org/jira/browse/CALCITE-5956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17760584#comment-17760584
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Julian Hyde commented on CALCITE-5956:
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If the {{MAP}} type were added to standard SQL, I wonder what syntax it would
have? The existing parameterized types {{ARRAY}} and {{MULTISET}} use prefix
form, which means that the argument appears before the type constructor, e.g.
"{{{}INTEGER ARRAY{}}}", "{{{}BOOLEAN MULTISET{}}}", "{{{}INTEGER ARRAY
ARRAY{}}}".
I wonder, could we use a prefix form for {{{}MAP{}}}, e.g. "{{{}(INTEGER,
BOOLEAN) MAP{}}}"?
> Support parsing non-standard collection types
> ---------------------------------------------
>
> Key: CALCITE-5956
> URL: https://issues.apache.org/jira/browse/CALCITE-5956
> Project: Calcite
> Issue Type: New Feature
> Components: core
> Affects Versions: 1.35.0
> Reporter: hongyu guo
> Assignee: hongyu guo
> Priority: Major
> Fix For: 1.36.0
>
>
> Calcite support SQL standard collection types. For example:
> {code:sql}
> INTEGER ARRAY;
> INTEGER ARRAY ARRAY;
> VARCHAR(5) MULTISET;
> INTEGER MULTISET ARRAY;{code}
> Many DBMS support a dialect of {{ARRAY<T>}} and {{MULITSET<T>}},
> I think Calcite can also support this dialect in core Parser.
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