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https://issues.apache.org/jira/browse/CALCITE-6116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17786067#comment-17786067
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Julian Hyde commented on CALCITE-6116:
--------------------------------------
[~hongyuguo], I'll review your [PR
3502|https://github.com/apache/calcite/pull/3502] in CALCITE-3679, because it
fixes both issues.
> Add EXISTS function (enabled in Spark library)
> ----------------------------------------------
>
> Key: CALCITE-6116
> URL: https://issues.apache.org/jira/browse/CALCITE-6116
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.36.0
> Reporter: hongyu guo
> Assignee: hongyu guo
> Priority: Major
> Fix For: 1.37.0
>
>
> exists(expr, pred) - Tests whether a predicate holds for one or more elements
> in the array.
> {code:sql}
> > SELECT `EXISTS`(array(1, 2, 3), x -> x % 2 == 0);
> true
> > SELECT `EXISTS`(array(1, 2, 3), x -> x % 2 == 10);
> false
> > SELECT `EXISTS`(array(1, null, 3), x -> x % 2 == 0);
> NULL
> > SELECT `EXISTS`(array(0, null, 2, 3, null), x -> x IS NULL);
> true
> > SELECT `EXISTS`(array(1, 2, 3), x -> x IS NULL);
> false
> {code}
> In Calcite, EXISTS is a keyword, so we need to specify the function with back
> quotes.
> Moreover, `EXISTS` is a higher-order function, and if we want to support
> higher-order functions in Calcite, we must first support lambda expressions
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