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Add a pragma to disable the query flattener - for use during testing.

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FossilOrigin-Name: 1d8550e5c88db0ea76aea579c1a5bf99d48fbe43
This commit is contained in:
drh
2009-12-22 00:29:53 +00:00
parent bf3e3a06cf
commit 7b688ede64
5 changed files with 35 additions and 15 deletions
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11
src/select.c
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@@ -957,7 +957,7 @@ static const char *columnType(
** of the SELECT statement. Return the declaration type and origin
** data for the result-set column of the sub-select.
*/
if( ALWAYS(iCol>=0 && iCol<pS->pEList->nExpr) ){
if( iCol>=0 && ALWAYS(iCol<pS->pEList->nExpr) ){
/* If iCol is less than zero, then the expression requests the
** rowid of the sub-select or view. This expression is legal (see
** test case misc2.2.2) - it always evaluates to NULL.
@@ -2518,7 +2518,7 @@ static void substSelect(
**
** (11) The subquery and the outer query do not both have ORDER BY clauses.
**
** (12) Not implemented. Subsumed into restriction (3). Was previously
** (**) Not implemented. Subsumed into restriction (3). Was previously
** a separate restriction deriving from ticket #350.
**
** (13) The subquery and outer query do not both use LIMIT
@@ -2592,6 +2592,13 @@ static int flattenSubquery(
*/
assert( p!=0 );
assert( p->pPrior==0 ); /* Unable to flatten compound queries */
/* The "PRAGMA omit_flattener=ON" statement disables query flattening for
** testing purposes. The only reason to disable the query flattener is
** to verify that we get the same answer with and without the flattener.
** In production use, there is never a reason to turn the flattener off. */
if( db->flags & SQLITE_OmitFlattener ) return 0;
pSrc = p->pSrc;
assert( pSrc && iFrom>=0 && iFrom<pSrc->nSrc );
pSubitem = &pSrc->a[iFrom];