Hey Jeyhun,
Thanks for bringing it up! +-1 from my side.
Personally, I find this feature confusing, it feels always natural to
use
column names. SQL power users will ask for it, I have seen it used in
automated complex queries also.
But it seems counterintuitive to enable flag for this feature. Enabling
it, should not disable grouping/ordering by the column names?
Best,
Muhammet
On 2024-06-17 20:30, Jeyhun Karimov wrote:
Hi devs,
I am moving our discussion on the PR thread [1] to the dev mailing list
to
close the loop on the related issue [2]. The end goal of the PR is to
support grouping/ordering by via column ordinals. The target
implementation
(currently there is no flag) should support a flag, so that a user can
also
use the old behavior as suggested by @Timo.
Some vendors such as Postgres [3], SQLite [4], MySQL/MariaDB [5],
Oracle
[6], Spark [7], and BigQuery[8] support group/order by clauses with
column
ordinals.
Obviously, supporting this clause might lead to less readable and
maintainable SQL code. This might also cause a bit of complications
both on
the codebase and on the user-experience side. On the other hand, we
already
see that numerous vendors support this feature out of the box, because
there was/is a need for this feature.
That is why, I would like to discuss and hear your opinions about
introducing/abandoning this feature.
Regards,
Jeyhun
[1] https://github.com/apache/flink/pull/24270
[2] https://issues.apache.org/jira/browse/FLINK-34366
[3] https://www.postgresql.org/docs/6.5/sql-select.htm
[4] https://www.sqlite.org/lang_select.html
[5] https://www.db-fiddle.com/f/uTrfRrNs4uXLr4Q9j2piCk/1
[6]
https://oracle-base.com/articles/23/group-by-and-having-clause-using-column-alias-or-column-position-23
[7]
https://github.com/apache/spark/commit/90613df652d45e121ab2b3a5bbb3b63cb15d297a
[8]
https://cloud.google.com/bigquery/docs/reference/standard-sql/query-syntax#group_by_col_ordinals
