Import SQLite 3.10.2.

third_party/sqlite/src/src/vacuum.c

Index: third_party/sqlite/src/src/vacuum.c
diff --git a/third_party/sqlite/src/src/vacuum.c b/third_party/sqlite/src/src/vacuum.c
index 4d0c0976a182a01a0195b047dc5289bca1095cb4..adc802e60b4330608c511829857dd14c74c597ce 100644
--- a/third_party/sqlite/src/src/vacuum.c
+++ b/third_party/sqlite/src/src/vacuum.c
@@ -94,7 +94,7 @@ static int execExecSql(sqlite3 *db, char **pzErrMsg, const char *zSql){
 ** overwriting the database with the vacuumed content.
 **
 ** Only 1x temporary space and only 1x writes would be required if
-** the copy of step (3) were replace by deleting the original database
+** the copy of step (3) were replaced by deleting the original database
 ** and renaming the transient database as the original.  But that will
 ** not work if other processes are attached to the original database.
 ** And a power loss in between deleting the original and renaming the
@@ -184,7 +184,7 @@ int sqlite3RunVacuum(char **pzErrMsg, sqlite3 *db){
   ** cause problems for the call to BtreeSetPageSize() below.  */
   sqlite3BtreeCommit(pTemp);
 
-  nRes = sqlite3BtreeGetReserve(pMain);
+  nRes = sqlite3BtreeGetOptimalReserve(pMain);
 
   /* A VACUUM cannot change the pagesize of an encrypted database. */
 #ifdef SQLITE_HAS_CODEC
@@ -250,6 +250,8 @@ int sqlite3RunVacuum(char **pzErrMsg, sqlite3 *db){
   ** an "INSERT INTO vacuum_db.xxx SELECT * FROM main.xxx;" to copy
   ** the contents to the temporary database.
   */
+  assert( (db->flags & SQLITE_Vacuum)==0 );
+  db->flags |= SQLITE_Vacuum;
   rc = execExecSql(db, pzErrMsg,
       "SELECT 'INSERT INTO vacuum_db.' || quote(name) "
       "|| ' SELECT * FROM main.' || quote(name) || ';'"
@@ -257,6 +259,8 @@ int sqlite3RunVacuum(char **pzErrMsg, sqlite3 *db){
       "WHERE type = 'table' AND name!='sqlite_sequence' "
       "  AND coalesce(rootpage,1)>0"
   );
+  assert( (db->flags & SQLITE_Vacuum)!=0 );
+  db->flags &= ~SQLITE_Vacuum;
   if( rc!=SQLITE_OK ) goto end_of_vacuum;
 
   /* Copy over the sequence table