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https://issues.apache.org/jira/browse/CALCITE-3815?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17056677#comment-17056677
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Feng Zhu commented on CALCITE-3815:
-----------------------------------
It seems that we cannot completely reuse _min/max_'s implementation for
_every/some_, at least in the runtime layer.
In min/max, if no rows are selected, the default result is NULL. However, for
every/some, we should get "false".
The query below is validated in PG. Therefore, I'd like to suggest implementing
them seperately.
{code:java}
select every(a>100)
from (VALUES (1, 11), (2, 22), (3, 33)) AS t (a, b)
-------------
false
{code}
> Add missing SQL standard aggregate functions: EVERY, SOME, INTERSECTION
> -----------------------------------------------------------------------
>
> Key: CALCITE-3815
> URL: https://issues.apache.org/jira/browse/CALCITE-3815
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Assignee: Hanumath Rao Maduri
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> Add missing SQL standard aggregate functions: EVERY, SOME, INTERSECTION.
> Examples:
> {code}
> SELECT deptno,
> EVERY(sal < 3000) AS es, SOME(sal < 1000) AS ss,
> EVERY(comm < 500) AS ec, SOME(comm < 500) AS sc
> FROM emp
> GROUP BY deptno;
> +--------+-------+-------+-------+------+
> | DEPTNO | ES | SS | EC | SC |
> +--------+-------+-------+-------+------+
> | 10 | FALSE | FALSE | | |
> | 20 | FALSE | TRUE | | |
> | 30 | TRUE | TRUE | FALSE | TRUE |
> +--------+-------+-------+-------+------+
> {code}
> {{EVERY}} and {{SOME}} can be implemented by translating to {{MIN}}, {{MAX}}:
> * {{EVERY(condition)}} is equivalent to {{MIN(condition)}};
> * {{SOME(condition)}} is equivalent to {{MAX(condition)}}
> where {{condition}} is a {{BOOLEAN}} expression, possibly allowing {{NULL}}
> values).
> {{INTERSECTION}} computes the intersection of collections (arrays and
> multisets). (Compare to {{FUSION}}, which computes the union of collections.)
> {{FUSION}} is in the operator table but there is no code-generation for it.
> This task should implement {{FUSION}} and {{INTERSECTION}} so that we can run
> queries in Enumerable mode.
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