postgres

History

Masahiko Sawada dfd8e6c73e Fix an issue with index scan using pg_trgm due to char signedness on different architectures. GIN and GiST indexes utilizing pg_trgm's opclasses store sorted trigrams within index tuples. When comparing and sorting each trigram, pg_trgm treats each character as a 'char[3]' type in C. However, the char type in C can be interpreted as either signed char or unsigned char, depending on the platform, if the signedness is not explicitly specified. Consequently, during replication between different CPU architectures, there was an issue where index scans on standby servers could not locate matching index tuples due to the differing treatment of character signedness. This change introduces comparison functions for trgm that explicitly handle signed char and unsigned char. The appropriate comparison function will be dynamically selected based on the character signedness stored in the control file. Therefore, upgraded clusters can utilize the indexes without rebuilding, provided the cluster upgrade occurs on platforms with the same character signedness as the original cluster initialization. The default char signedness information was introduced in `44fe30fdab`, so no backpatch. Reviewed-by: Noah Misch <noah@leadboat.com> Discussion: https://postgr.es/m/CB11ADBC-0C3F-4FE0-A678-666EE80CBB07%40amazon.com		11 months ago
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data	…
expected	Fix arrays comparison in CompareOpclassOptions()	1 year ago
sql	Fix arrays comparison in CompareOpclassOptions()	1 year ago
.gitignore	…
Makefile	…
meson.build	Update copyright for 2025	1 year ago
pg_trgm--1.0--1.1.sql	…
pg_trgm--1.1--1.2.sql	…
pg_trgm--1.2--1.3.sql	…
pg_trgm--1.3--1.4.sql	…
pg_trgm--1.3.sql	…
pg_trgm--1.4--1.5.sql	…
pg_trgm--1.5--1.6.sql	…
pg_trgm.control	…
trgm.h	Fix an issue with index scan using pg_trgm due to char signedness on different architectures.	11 months ago
trgm_gin.c	New header varatt.h split off from postgres.h	3 years ago
trgm_gist.c	Remove various unnecessary (char *) casts	11 months ago
trgm_op.c	Fix an issue with index scan using pg_trgm due to char signedness on different architectures.	11 months ago
trgm_regexp.c	Update copyright for 2025	1 year ago