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Provide hints to the btree layer during the creation of transient tables

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when it is possible for those tables to use a hash rather than a binary tree.
No use is current made of those hints, though assert() statement verify
their accuracy.

FossilOrigin-Name: 4fead8e714c7e50a9d246467e62bc846ef6180a0
This commit is contained in:
drh
2010-08-30 22:15:45 +00:00
parent c223b8f1a8
commit d4187c716c
10 changed files with 79 additions and 38 deletions
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13
src/expr.c
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@@ -1535,8 +1535,8 @@ int sqlite3FindInIndex(Parse *pParse, Expr *pX, int *prNotFound){
#endif
/*
** Generate code for scalar subqueries used as an expression
** and IN operators. Examples:
** Generate code for scalar subqueries used as a subquery expression, EXISTS,
** or IN operators. Examples:
**
** (SELECT a FROM b) -- subquery
** EXISTS (SELECT a FROM b) -- EXISTS subquery
@@ -1599,10 +1599,10 @@ int sqlite3CodeSubselect(
switch( pExpr->op ){
case TK_IN: {
char affinity;
KeyInfo keyInfo;
int addr; /* Address of OP_OpenEphemeral instruction */
Expr *pLeft = pExpr->pLeft;
char affinity; /* Affinity of the LHS of the IN */
KeyInfo keyInfo; /* Keyinfo for the generated table */
int addr; /* Address of OP_OpenEphemeral instruction */
Expr *pLeft = pExpr->pLeft; /* the LHS of the IN operator */
if( rMayHaveNull ){
sqlite3VdbeAddOp2(v, OP_Null, 0, rMayHaveNull);
@@ -1625,6 +1625,7 @@ int sqlite3CodeSubselect(
*/
pExpr->iTable = pParse->nTab++;
addr = sqlite3VdbeAddOp2(v, OP_OpenEphemeral, pExpr->iTable, !isRowid);
if( rMayHaveNull==0 ) sqlite3VdbeChangeP5(v, BTREE_UNORDERED);
memset(&keyInfo, 0, sizeof(keyInfo));
keyInfo.nField = 1;