database/sqlite
1
0
Fork 0
mirror of https://github.com/sqlite/sqlite.git synced 2025-08-10 01:02:56 +03:00
Code Activity

Slightly faster implementation of sqlite3ExprAffinity().

Browse Source 
FossilOrigin-Name: 01cf3278c9c00dddcac67aa4b22ca26a52c31932cba35daa634a56b4c264bdeb
This commit is contained in:
drh
2022-12-13 13:33:28 +00:00
parent 3c9749ab74
commit 6042e30bda
3 changed files with 46 additions and 43 deletions
Download Patch File Download Diff File Expand all files Collapse all files

73
src/expr.c
View File

@@ -44,44 +44,47 @@ char sqlite3TableColumnAffinity(const Table *pTab, int iCol){
*/
char sqlite3ExprAffinity(const Expr *pExpr){
int op;
while( ExprHasProperty(pExpr, EP_Skip|EP_IfNullRow) ){
assert( pExpr->op==TK_COLLATE
|| pExpr->op==TK_IF_NULL_ROW
|| (pExpr->op==TK_REGISTER && pExpr->op2==TK_IF_NULL_ROW) );
pExpr = pExpr->pLeft;
assert( pExpr!=0 );
}
op = pExpr->op;
if( op==TK_REGISTER ) op = pExpr->op2;
if( op==TK_COLUMN || (op==TK_AGG_COLUMN && pExpr->y.pTab!=0) ){
assert( ExprUseYTab(pExpr) );
assert( pExpr->y.pTab!=0 );
return sqlite3TableColumnAffinity(pExpr->y.pTab, pExpr->iColumn);
}
if( op==TK_SELECT ){
assert( ExprUseXSelect(pExpr) );
assert( pExpr->x.pSelect!=0 );
assert( pExpr->x.pSelect->pEList!=0 );
assert( pExpr->x.pSelect->pEList->a[0].pExpr!=0 );
return sqlite3ExprAffinity(pExpr->x.pSelect->pEList->a[0].pExpr);
}
while( 1 /* exit-by-break */ ){
if( op==TK_COLUMN || (op==TK_AGG_COLUMN && pExpr->y.pTab!=0) ){
assert( ExprUseYTab(pExpr) );
assert( pExpr->y.pTab!=0 );
return sqlite3TableColumnAffinity(pExpr->y.pTab, pExpr->iColumn);
}
if( op==TK_SELECT ){
assert( ExprUseXSelect(pExpr) );
assert( pExpr->x.pSelect!=0 );
assert( pExpr->x.pSelect->pEList!=0 );
assert( pExpr->x.pSelect->pEList->a[0].pExpr!=0 );
return sqlite3ExprAffinity(pExpr->x.pSelect->pEList->a[0].pExpr);
}
#ifndef SQLITE_OMIT_CAST
if( op==TK_CAST ){
assert( !ExprHasProperty(pExpr, EP_IntValue) );
return sqlite3AffinityType(pExpr->u.zToken, 0);
}
if( op==TK_CAST ){
assert( !ExprHasProperty(pExpr, EP_IntValue) );
return sqlite3AffinityType(pExpr->u.zToken, 0);
}
#endif
if( op==TK_SELECT_COLUMN ){
assert( pExpr->pLeft!=0 && ExprUseXSelect(pExpr->pLeft) );
assert( pExpr->iColumn < pExpr->iTable );
assert( pExpr->iTable==pExpr->pLeft->x.pSelect->pEList->nExpr );
return sqlite3ExprAffinity(
pExpr->pLeft->x.pSelect->pEList->a[pExpr->iColumn].pExpr
);
}
if( op==TK_VECTOR ){
assert( ExprUseXList(pExpr) );
return sqlite3ExprAffinity(pExpr->x.pList->a[0].pExpr);
if( op==TK_SELECT_COLUMN ){
assert( pExpr->pLeft!=0 && ExprUseXSelect(pExpr->pLeft) );
assert( pExpr->iColumn < pExpr->iTable );
assert( pExpr->iTable==pExpr->pLeft->x.pSelect->pEList->nExpr );
return sqlite3ExprAffinity(
pExpr->pLeft->x.pSelect->pEList->a[pExpr->iColumn].pExpr
);
}
if( op==TK_VECTOR ){
assert( ExprUseXList(pExpr) );
return sqlite3ExprAffinity(pExpr->x.pList->a[0].pExpr);
}
if( ExprHasProperty(pExpr, EP_Skip|EP_IfNullRow) ){
assert( pExpr->op==TK_COLLATE
|| pExpr->op==TK_IF_NULL_ROW
|| (pExpr->op==TK_REGISTER && pExpr->op2==TK_IF_NULL_ROW) );
pExpr = pExpr->pLeft;
op = pExpr->op;
continue;
}
if( op!=TK_REGISTER || (op = pExpr->op2)==TK_REGISTER ) break;
}
return pExpr->affExpr;
}