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https://issues.apache.org/jira/browse/FLINK-34366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17814898#comment-17814898
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Jeyhun Karimov commented on FLINK-34366:
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Hi [~martijnvisser] I worked on this issue. Could you please check the PR?
> Add support to group rows by column ordinals
> --------------------------------------------
>
> Key: FLINK-34366
> URL: https://issues.apache.org/jira/browse/FLINK-34366
> Project: Flink
> Issue Type: New Feature
> Components: Table SQL / API
> Reporter: Martijn Visser
> Priority: Major
> Labels: pull-request-available
>
> Reference: BigQuery
> https://cloud.google.com/bigquery/docs/reference/standard-sql/query-syntax#group_by_col_ordinals
> The GROUP BY clause can refer to expression names in the SELECT list. The
> GROUP BY clause also allows ordinal references to expressions in the SELECT
> list, using integer values. 1 refers to the first value in the SELECT list, 2
> the second, and so forth. The value list can combine ordinals and value
> names. The following queries are equivalent:
> {code:sql}
> WITH PlayerStats AS (
> SELECT 'Adams' as LastName, 'Noam' as FirstName, 3 as PointsScored UNION ALL
> SELECT 'Buchanan', 'Jie', 0 UNION ALL
> SELECT 'Coolidge', 'Kiran', 1 UNION ALL
> SELECT 'Adams', 'Noam', 4 UNION ALL
> SELECT 'Buchanan', 'Jie', 13)
> SELECT SUM(PointsScored) AS total_points, LastName, FirstName
> FROM PlayerStats
> GROUP BY LastName, FirstName;
> /*--------------+----------+-----------+
> | total_points | LastName | FirstName |
> +--------------+----------+-----------+
> | 7 | Adams | Noam |
> | 13 | Buchanan | Jie |
> | 1 | Coolidge | Kiran |
> +--------------+----------+-----------*/
> {code}
> {code:sql}
> WITH PlayerStats AS (
> SELECT 'Adams' as LastName, 'Noam' as FirstName, 3 as PointsScored UNION ALL
> SELECT 'Buchanan', 'Jie', 0 UNION ALL
> SELECT 'Coolidge', 'Kiran', 1 UNION ALL
> SELECT 'Adams', 'Noam', 4 UNION ALL
> SELECT 'Buchanan', 'Jie', 13)
> SELECT SUM(PointsScored) AS total_points, LastName, FirstName
> FROM PlayerStats
> GROUP BY 2, 3;
> /*--------------+----------+-----------+
> | total_points | LastName | FirstName |
> +--------------+----------+-----------+
> | 7 | Adams | Noam |
> | 13 | Buchanan | Jie |
> | 1 | Coolidge | Kiran |
> +--------------+----------+-----------*/
> {code}
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