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Overview
| Comment: | Speed up wildcard searches in LIKE using strchr() |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | like-compare-opt |
| Files: | files | file ages | folders |
| SHA3-256: | 4d336d742043af1f520eff3f462bdb3db495d3045a81a987c3890e7de09bcc00 |
| User & Date: | drh 2017-10-30 18:26:59 |
Context
|
2017-10-30
| ||
| 18:26 | Speed up wildcard searches in LIKE using strchr() Closed-Leaf check-in: 4d336d74 user: drh tags: like-compare-opt | |
|
2017-10-28
| ||
| 20:54 | Increase the version number for the next release - which is still months away but there have been significant query planner enhancements since the previous release. check-in: 457eedfa user: drh tags: trunk | |
Changes
Changes to src/func.c.
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int bMatch;
if( noCase ){
cx = sqlite3Toupper(c);
c = sqlite3Tolower(c);
}else{
cx = c;
}
while( (c2 = *(zString++))!=0 ){
if( c2!=c && c2!=cx ) continue;
bMatch = patternCompare(zPattern,zString,pInfo,matchOther);
if( bMatch!=SQLITE_NOMATCH ) return bMatch;
}
}else{
int bMatch;
while( (c2 = Utf8Read(zString))!=0 ){
if( c2!=c ) continue;
bMatch = patternCompare(zPattern,zString,pInfo,matchOther);
if( bMatch!=SQLITE_NOMATCH ) return bMatch;
}
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int bMatch;
if( noCase ){
cx = sqlite3Toupper(c);
c = sqlite3Tolower(c);
}else{
cx = c;
}
while(1){
const u8 *zStr1 = (const u8*)strchr((const char*)zString,c);
if( cx!=c ){
const u8 *zStr2 = (const u8*)strchr((const char*)zString,cx);
if( zStr1==0 || (zStr2!=0 && zStr2<zStr1) ) zStr1 = zStr2;
}
if( zStr1==0 ) break;
zString = &zStr1[1];
bMatch = patternCompare(zPattern,zString,pInfo,matchOther);
if( bMatch!=SQLITE_NOMATCH ) return bMatch;
}
#if 0
while( (c2 = *(zString++))!=0 ){
if( c2!=c && c2!=cx ) continue;
bMatch = patternCompare(zPattern,zString,pInfo,matchOther);
if( bMatch!=SQLITE_NOMATCH ) return bMatch;
}
#endif
}else{
int bMatch;
while( (c2 = Utf8Read(zString))!=0 ){
if( c2!=c ) continue;
bMatch = patternCompare(zPattern,zString,pInfo,matchOther);
if( bMatch!=SQLITE_NOMATCH ) return bMatch;
}
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