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https://issues.apache.org/jira/browse/CALCITE-3504?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16974376#comment-16974376
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Stamatis Zampetakis commented on CALCITE-3504:
----------------------------------------------
In Postgres you can create an empty array if you specify the type:
{code:sql}
SELECT ARRAY[]::integer[];
{code}
In the same spirit I would try the following in Calcite:
{code:sql}
SELECT CAST(ARRAY[] as INT ARRAY) FROM foo;
{code}
> allow empty ARRAY[] literals
> ----------------------------
>
> Key: CALCITE-3504
> URL: https://issues.apache.org/jira/browse/CALCITE-3504
> Project: Calcite
> Issue Type: Wish
> Affects Versions: 1.21.0
> Reporter: Pressenna
> Priority: Major
>
> Currently an ARRAY expression requires at least one element.
> Please allow empty ARRAY expressions.
> {code:sql}
> SELECT ARRAY[] FROM foo;
> -- or more concise for updates:
> UPDATE food set array_column = ARRAY[];
> {code}
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