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Faster column name lookup in the columnIndex() routine using hashing.

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FossilOrigin-Name: de2a90812498e504c9b8eeb83bfc48a948b45e87bdfa242c0aa9f0377d90740f
This commit is contained in:
drh
2020-07-20 13:11:19 +00:00
parent 51da8daf82
commit a192807c13
3 changed files with 11 additions and 9 deletions
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6
src/select.c
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@@ -264,8 +264,10 @@ int sqlite3JoinType(Parse *pParse, Token *pA, Token *pB, Token *pC){
*/
static int columnIndex(Table *pTab, const char *zCol){
int i;
for(i=0; i<pTab->nCol; i++){
if( sqlite3StrICmp(pTab->aCol[i].zName, zCol)==0 ) return i;
u8 h = sqlite3StrIHash(zCol);
Column *pCol;
for(pCol=pTab->aCol, i=0; i<pTab->nCol; pCol++, i++){
if( pCol->hName==h && sqlite3StrICmp(pCol->zName, zCol)==0 ) return i;
}
return -1;
}