database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-06-25 01:02:05 +03:00
Code Activity

Add prefix operator for TEXT type.

Browse Source 
The prefix operator along with SP-GiST indexes can be used as an alternative
for LIKE 'word%' commands  and it doesn't have a limitation of string/prefix
length as B-Tree has.

Bump catalog version

Author: Ildus Kurbangaliev with some editorization by me
Review by: Arthur Zakirov, Alexander Korotkov, and me
Discussion: https://www.postgresql.org/message-id/flat/20180202180327.222b04b3@wp.localdomain
This commit is contained in:
Teodor Sigaev
2018-04-03 19:46:45 +03:00
parent 4ab2999815
commit 710d90da1f
14 changed files with 189 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

28
src/backend/utils/adt/varlena.c
View File

@ -1761,6 +1761,34 @@ text_ge(PG_FUNCTION_ARGS)
PG_RETURN_BOOL(result);
}
Datum
text_starts_with(PG_FUNCTION_ARGS)
{
Datum arg1 = PG_GETARG_DATUM(0);
Datum arg2 = PG_GETARG_DATUM(1);
bool result;
Size len1,
len2;
len1 = toast_raw_datum_size(arg1);
len2 = toast_raw_datum_size(arg2);
if (len2 > len1)
result = false;
else
{
text *targ1 = DatumGetTextPP(arg1);
text *targ2 = DatumGetTextPP(arg2);
result = (memcmp(VARDATA_ANY(targ1), VARDATA_ANY(targ2),
VARSIZE_ANY_EXHDR(targ2)) == 0);
PG_FREE_IF_COPY(targ1, 0);
PG_FREE_IF_COPY(targ2, 1);
}
PG_RETURN_BOOL(result);
}
Datum
bttextcmp(PG_FUNCTION_ARGS)
{