database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-12-21 05:21:08 +03:00
Code Activity

Add sort support routine for the UUID data type.

Browse Source 
This introduces a simple encoding scheme to produce abbreviated keys:
pack as many bytes of each UUID as will fit into a Datum.  On
little-endian machines, a byteswap is also performed; the abbreviated
comparator can therefore just consist of a simple 3-way unsigned integer
comparison.

The purpose of this change is to speed up sorting data on a column
of type UUID.

Peter Geoghegan
This commit is contained in:
Robert Haas
2015-11-06 12:10:42 -05:00
parent 5644419b3d
commit a76ef15d9f
4 changed files with 191 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
src/include/utils/builtins.h
View File

@@ -1174,6 +1174,7 @@ extern Datum uuid_ge(PG_FUNCTION_ARGS);
extern Datum uuid_gt(PG_FUNCTION_ARGS);
extern Datum uuid_ne(PG_FUNCTION_ARGS);
extern Datum uuid_cmp(PG_FUNCTION_ARGS);
extern Datum uuid_sortsupport(PG_FUNCTION_ARGS);
extern Datum uuid_hash(PG_FUNCTION_ARGS);
/* windowfuncs.c */