bpo-32215: Fix performance regression in sqlite3 (GH-8511)

(cherry picked from commit 8d1e190)

Co-authored-by: Berker Peksag <[email protected]>

Author: miss-islington

Misc/NEWS.d/next/Library/2018-07-28-12-08-53.bpo-32215.EU68SY.rst

@@ -0,0 +1,2 @@
+Fix performance regression in :mod:`sqlite3` when a DML statement appeared
+in a different line than the rest of the SQL query.

Modules/_sqlite/statement.c

@@ -85,10 +85,10 @@ int pysqlite_statement_create(pysqlite_Statement* self, pysqlite_Connection* con
                 continue;
         }
 
-        self->is_dml = (PyOS_strnicmp(p, "insert ", 7) == 0)
-                    || (PyOS_strnicmp(p, "update ", 7) == 0)
-                    || (PyOS_strnicmp(p, "delete ", 7) == 0)
-                    || (PyOS_strnicmp(p, "replace ", 8) == 0);
+        self->is_dml = (PyOS_strnicmp(p, "insert", 6) == 0)
+                    || (PyOS_strnicmp(p, "update", 6) == 0)
+                    || (PyOS_strnicmp(p, "delete", 6) == 0)
+                    || (PyOS_strnicmp(p, "replace", 7) == 0);
         break;
     }