yql/essentials/tests/sql/suites/subselect/group_by_source.sqlx


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$input = SELECT * FROM AS_TABLE([
    <|k: 1, v: 1|>, <|k: 2, v: 1|>,
    <|k: 1, v: 2|>, <|k: 2, v: 2|>,
    <|k: 1, v: 3|>, <|k: 2, v: 3|>,
    <|k: 1, v: 4|>, <|k: 2, v: 4|>,
    <|k: 1, v: 5|>, <|k: 2, v: 5|>,
]);

SELECT k, Avg(v) FROM $input GROUP BY (SELECT Avg(v) FROM $input) AS k;