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Add the "sorter-reference" optimization, allowing SQLite to be configured so

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that some required values may be loaded from the database after external
sorting occurs for SELECT statements with ORDER BY clauses that are not
satisfied by database indexes.

FossilOrigin-Name: ef74090a40ceaef2fd93a7613ec99a191ce986811c852e96f4a19719f18af4f0
This commit is contained in:
dan
2018-04-18 19:56:14 +00:00
parent 52b3e340cc 5a2e65ed63
commit dedff6be8a
15 changed files with 398 additions and 42 deletions
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7
src/expr.c
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@@ -1363,6 +1363,7 @@ ExprList *sqlite3ExprListDup(sqlite3 *db, ExprList *p, int flags){
pItem->sortOrder = pOldItem->sortOrder;
pItem->done = 0;
pItem->bSpanIsTab = pOldItem->bSpanIsTab;
pItem->bSorterRef = pOldItem->bSorterRef;
pItem->u = pOldItem->u;
}
return pNew;
@@ -4373,6 +4374,12 @@ int sqlite3ExprCodeExprList(
if( !ConstFactorOk(pParse) ) flags &= ~SQLITE_ECEL_FACTOR;
for(pItem=pList->a, i=0; i<n; i++, pItem++){
Expr *pExpr = pItem->pExpr;
#ifdef SQLITE_ENABLE_SORTER_REFERENCES
if( pItem->bSorterRef ){
i--;
n--;
}else
#endif
if( (flags & SQLITE_ECEL_REF)!=0 && (j = pItem->u.x.iOrderByCol)>0 ){
if( flags & SQLITE_ECEL_OMITREF ){
i--;