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Add the SQLITE_DBCONFIG_ENABLE_QPSG option to activate the query planner

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stability guarantee.  This involves refactoring the sqlite3.flags bitvector
to carve out a free bit to use.

FossilOrigin-Name: 7076e8283ebae1b45a5d85d9538b49b6da399d38c3c6935de100f948f814f6a9
This commit is contained in:
drh
2017-06-26 13:57:49 +00:00
parent a22dd3860a
commit 169dd928c5
15 changed files with 160 additions and 65 deletions
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10
src/btree.c
View File

@@ -152,7 +152,7 @@ static int hasSharedCacheTableLock(
** Return true immediately.
*/
if( (pBtree->sharable==0)
|| (eLockType==READ_LOCK && (pBtree->db->flags & SQLITE_ReadUncommitted))
|| (eLockType==READ_LOCK && (pBtree->db->flags & SQLITE_ReadUncommit))
){
return 1;
}
@@ -229,7 +229,7 @@ static int hasReadConflicts(Btree *pBtree, Pgno iRoot){
for(p=pBtree->pBt->pCursor; p; p=p->pNext){
if( p->pgnoRoot==iRoot
&& p->pBtree!=pBtree
&& 0==(p->pBtree->db->flags & SQLITE_ReadUncommitted)
&& 0==(p->pBtree->db->flags & SQLITE_ReadUncommit)
){
return 1;
}
@@ -251,7 +251,7 @@ static int querySharedCacheTableLock(Btree *p, Pgno iTab, u8 eLock){
assert( sqlite3BtreeHoldsMutex(p) );
assert( eLock==READ_LOCK || eLock==WRITE_LOCK );
assert( p->db!=0 );
assert( !(p->db->flags&SQLITE_ReadUncommitted)||eLock==WRITE_LOCK||iTab==1 );
assert( !(p->db->flags&SQLITE_ReadUncommit)||eLock==WRITE_LOCK||iTab==1 );
/* If requesting a write-lock, then the Btree must have an open write
** transaction on this file. And, obviously, for this to be so there
@@ -329,7 +329,7 @@ static int setSharedCacheTableLock(Btree *p, Pgno iTable, u8 eLock){
** obtain a read-lock using this function. The only read-lock obtained
** by a connection in read-uncommitted mode is on the sqlite_master
** table, and that lock is obtained in BtreeBeginTrans(). */
assert( 0==(p->db->flags&SQLITE_ReadUncommitted) || eLock==WRITE_LOCK );
assert( 0==(p->db->flags&SQLITE_ReadUncommit) || eLock==WRITE_LOCK );
/* This function should only be called on a sharable b-tree after it
** has been determined that no other b-tree holds a conflicting lock. */
@@ -3021,7 +3021,7 @@ static int lockBtree(BtShared *pBt){
pageSize-usableSize);
return rc;
}
if( (pBt->db->flags & SQLITE_RecoveryMode)==0 && nPage>nPageFile ){
if( (pBt->db->flags & SQLITE_WriteSchema)==0 && nPage>nPageFile ){
rc = SQLITE_CORRUPT_BKPT;
goto page1_init_failed;
}