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Remove the (undocumented) query-planner control that prevents

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a "SELECT ALL" subquery in FROM clause from being implemented as a co-routine.

FossilOrigin-Name: ff2f5a31a2ac67a2fdbb25793e8013cb0e062ab90bdcba2d52a62d6d4d8b6d18
This commit is contained in:
drh
2017-09-28 17:29:24 +00:00
parent 3d240d2119
commit 2e9d706252
3 changed files with 9 additions and 11 deletions
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6
src/select.c
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@@ -5317,9 +5317,7 @@ int sqlite3Select(
** The subquery is implemented as a co-routine if all of these are true:
** (1) The subquery is guaranteed to be the outer loop (so that it
** does not need to be computed more than once)
** (2) The ALL keyword after SELECT is omitted. (Applications are
** allowed to say "SELECT ALL" instead of just "SELECT" to disable
** the use of co-routines.)
** (2) REMOVED (2017-09-28): The ALL keyword after SELECT is omitted.
** (3) Co-routines are not disabled using sqlite3_test_control()
** with SQLITE_TESTCTRL_OPTIMIZATIONS.
**
@@ -5329,7 +5327,7 @@ int sqlite3Select(
if( i==0
&& (pTabList->nSrc==1
|| (pTabList->a[1].fg.jointype&(JT_LEFT|JT_CROSS))!=0) /* (1) */
&& (p->selFlags & SF_All)==0 /* (2) */
/*** constraint removed: && (p->selFlags & SF_All)==0 (2) */
&& OptimizationEnabled(db, SQLITE_SubqCoroutine) /* (3) */
){
/* Implement a co-routine that will return a single row of the result