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Implement physical plan for EXISTS subquery #123

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@alamb

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@alamb

Note: migrated from original JIRA: https://issues.apache.org/jira/browse/ARROW-10819

The TPC-H queries include use of the EXISTS which is used to test for the existence of any record in a subquery. For example:

and *exists* (
    select
        *
    from
        lineitem
    where
        l_orderkey = o_orderkey
        and l_commitdate < l_receiptdate
)

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