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| author | Andrew Gierth <rhodiumtoad@postgresql.org> | 2019-06-30 23:49:13 +0100 |
|---|---|---|
| committer | Andrew Gierth <rhodiumtoad@postgresql.org> | 2019-06-30 23:49:13 +0100 |
| commit | da53be23d1c5e529675e958eaee54cfed4e4dbac (patch) | |
| tree | c312d87428ebd5ff945c4adc6e5ba2dae3f907b4 /contrib/postgres_fdw/sql/postgres_fdw.sql | |
| parent | c000a47ad1fdd4fb92c7068279d97e0c3db4f8eb (diff) | |
| download | postgresql-da53be23d1c5e529675e958eaee54cfed4e4dbac.tar.gz postgresql-da53be23d1c5e529675e958eaee54cfed4e4dbac.zip | |
Repair logic for reordering grouping sets optimization.
The logic in reorder_grouping_sets to order grouping set elements to
match a pre-specified sort ordering was defective, resulting in
unnecessary sort nodes (though the query output would still be
correct). Repair, simplifying the code a little, and add a test.
Per report from Richard Guo, though I didn't use their patch. Original
bug seems to have been my fault.
Backpatch back to 9.5 where grouping sets were introduced.
Discussion: https://postgr.es/m/CAN_9JTzyjGcUjiBHxLsgqfk7PkdLGXiM=pwM+=ph2LsWw0WO1A@mail.gmail.com
Diffstat (limited to 'contrib/postgres_fdw/sql/postgres_fdw.sql')
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