Many hyperlinks are disabled.
Use anonymous login
to enable hyperlinks.
Overview
| Comment: | Small performance increase and size reduction in the implementation of the LIKE and GLOB operators. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: |
f97626f921dafe596b615a168ef31987 |
| User & Date: | drh 2019-04-30 11:54:36 |
Context
|
2019-04-30
| ||
| 14:26 | Fix an error message in the Lemon parser generator. (check-in: b6d7d42b user: drh tags: trunk) | |
| 11:54 | Small performance increase and size reduction in the implementation of the LIKE and GLOB operators. (check-in: f97626f9 user: drh tags: trunk) | |
| 01:08 | Slightly smaller and faster implementation of the OP_MakeRecord opcode. (check-in: 3bdce7ef user: drh tags: trunk) | |
Changes
Changes to src/func.c.
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
...
869
870
871
872
873
874
875
876
877
878
879
880
881
882
|
#ifdef SQLITE_TEST
sqlite3_like_count++;
#endif
sqlite3_result_int(context, 0);
return;
}
#endif
zB = sqlite3_value_text(argv[0]);
zA = sqlite3_value_text(argv[1]);
/* Limit the length of the LIKE or GLOB pattern to avoid problems
** of deep recursion and N*N behavior in patternCompare().
*/
nPat = sqlite3_value_bytes(argv[0]);
testcase( nPat==db->aLimit[SQLITE_LIMIT_LIKE_PATTERN_LENGTH] );
testcase( nPat==db->aLimit[SQLITE_LIMIT_LIKE_PATTERN_LENGTH]+1 );
if( nPat > db->aLimit[SQLITE_LIMIT_LIKE_PATTERN_LENGTH] ){
sqlite3_result_error(context, "LIKE or GLOB pattern too complex", -1);
return;
}
assert( zB==sqlite3_value_text(argv[0]) ); /* Encoding did not change */
if( argc==3 ){
/* The escape character string must consist of a single UTF-8 character.
** Otherwise, return an error.
*/
const unsigned char *zEsc = sqlite3_value_text(argv[2]);
if( zEsc==0 ) return;
if( sqlite3Utf8CharLen((char*)zEsc, -1)!=1 ){
................................................................................
"ESCAPE expression must be a single character", -1);
return;
}
escape = sqlite3Utf8Read(&zEsc);
}else{
escape = pInfo->matchSet;
}
if( zA && zB ){
#ifdef SQLITE_TEST
sqlite3_like_count++;
#endif
sqlite3_result_int(context,
patternCompare(zB, zA, pInfo, escape)==SQLITE_MATCH);
}
|
<
<
<
<
>
>
|
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
...
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
|
#ifdef SQLITE_TEST
sqlite3_like_count++;
#endif
sqlite3_result_int(context, 0);
return;
}
#endif
/* Limit the length of the LIKE or GLOB pattern to avoid problems
** of deep recursion and N*N behavior in patternCompare().
*/
nPat = sqlite3_value_bytes(argv[0]);
testcase( nPat==db->aLimit[SQLITE_LIMIT_LIKE_PATTERN_LENGTH] );
testcase( nPat==db->aLimit[SQLITE_LIMIT_LIKE_PATTERN_LENGTH]+1 );
if( nPat > db->aLimit[SQLITE_LIMIT_LIKE_PATTERN_LENGTH] ){
sqlite3_result_error(context, "LIKE or GLOB pattern too complex", -1);
return;
}
if( argc==3 ){
/* The escape character string must consist of a single UTF-8 character.
** Otherwise, return an error.
*/
const unsigned char *zEsc = sqlite3_value_text(argv[2]);
if( zEsc==0 ) return;
if( sqlite3Utf8CharLen((char*)zEsc, -1)!=1 ){
................................................................................
"ESCAPE expression must be a single character", -1);
return;
}
escape = sqlite3Utf8Read(&zEsc);
}else{
escape = pInfo->matchSet;
}
zB = sqlite3_value_text(argv[0]);
zA = sqlite3_value_text(argv[1]);
if( zA && zB ){
#ifdef SQLITE_TEST
sqlite3_like_count++;
#endif
sqlite3_result_int(context,
patternCompare(zB, zA, pInfo, escape)==SQLITE_MATCH);
}
|