Thread: pgsql: Disallow partitionwise join when collations don't match
Disallow partitionwise join when collations don't match If the collation of any join key column doesn’t match the collation of the corresponding partition key, partitionwise joins can yield incorrect results. For example, rows that would match under the join key collation might be located in different partitions due to the partitioning collation. In such cases, a partitionwise join would yield different results from a non-partitionwise join, so disallow it in such cases. Reported-by: Tender Wang <tndrwang@gmail.com> Author: Jian He <jian.universality@gmail.com> Reviewed-by: Tender Wang <tndrwang@gmail.com> Reviewed-by: Junwang Zhao <zhjwpku@gmail.com> Discussion: https://postgr.es/m/CAHewXNno_HKiQ6PqyLYfuqDtwp7KKHZiH1J7Pqyz0nr+PS2Dwg@mail.gmail.com Backpatch-through: 12 Branch ------ REL_17_STABLE Details ------- https://git.postgresql.org/pg/commitdiff/a0cdfc8893673d1325f077b79f551aa105f360b8 Modified Files -------------- src/backend/optimizer/util/relnode.c | 4 + src/test/regress/expected/collate.icu.utf8.out | 118 +++++++++++++++++++++++++ src/test/regress/sql/collate.icu.utf8.sql | 22 +++++ 3 files changed, 144 insertions(+)