Work toward reducing the incremental size of an ExprList object to 24-byte
per entry, from 32-bytes (on a 64-bit machine). This helps the new
mini-lookaside allocator to run better by avoiding excessive reallocs.
The current change mostly works, but still has a few loose ends to tie up.
This check-in is merely a snapshot to save my work.
FossilOrigin-Name: fdda76cfb01bf2b19522ac4558b443634d28a69b0828677c42682b645eae1f3b
diff --git a/src/expr.c b/src/expr.c
index f9c57ba..0ca1d04 100644
--- a/src/expr.c
+++ b/src/expr.c
@@ -1437,11 +1437,10 @@
}
}
pItem->zEName = sqlite3DbStrDup(db, pOldItem->zEName);
- pItem->zSpan = sqlite3DbStrDup(db, pOldItem->zSpan);
pItem->sortFlags = pOldItem->sortFlags;
+ pItem->eEName = pOldItem->eEName;
pItem->done = 0;
pItem->bNulls = pOldItem->bNulls;
- pItem->bSpanIsTab = pOldItem->bSpanIsTab;
pItem->bSorterRef = pOldItem->bSorterRef;
pItem->u = pOldItem->u;
}
@@ -1773,8 +1772,10 @@
if( pList ){
struct ExprList_item *pItem = &pList->a[pList->nExpr-1];
assert( pList->nExpr>0 );
- sqlite3DbFree(db, pItem->zSpan);
- pItem->zSpan = sqlite3DbSpanDup(db, zStart, zEnd);
+ if( pItem->zEName==0 ){
+ pItem->zEName = sqlite3DbSpanDup(db, zStart, zEnd);
+ pItem->eEName = ENAME_SPAN;
+ }
}
}
@@ -1805,7 +1806,6 @@
do{
sqlite3ExprDelete(db, pItem->pExpr);
sqlite3DbFree(db, pItem->zEName);
- sqlite3DbFree(db, pItem->zSpan);
pItem++;
}while( --i>0 );
sqlite3DbFreeNN(db, pList);