MXS-2413 Parse 'DROP DATABASE [IF EXISTS] db' completely

query_classifier/qc_sqlite/sqlite-src-3110100/src/parse.y

@@ -615,7 +615,7 @@ columnid(A) ::= nm(X). {
   // TODO: However, if not here then rules such as CAST need to be modified.
   BINARY
   /*CASCADE*/ CAST CLOSE COLUMNKW COLUMNS COMMENT CONCURRENT /*CONFLICT*/
-  DATA /*DATABASE*/ DEALLOCATE DEFERRED /*DESC*/ /*DETACH*/ DUMPFILE
+  DATA DATABASE DEALLOCATE DEFERRED /*DESC*/ /*DETACH*/ DUMPFILE
   /*EACH*/ END ENGINE ENUM EXCLUSIVE /*EXPLAIN*/
   FIRST FLUSH /*FOR*/ FORMAT
   GLOBAL
@@ -2861,6 +2861,12 @@ eq_opt ::= EQ.
 default_opt ::= .
 default_opt ::= DEFAULT.
 
+////////////////////////// DROP DATABASE statement /////////////////////////////////////
+//
+cmd ::= DROP DATABASE ifexists id(X). {
+    maxscaleDrop(pParse, MXS_DROP_DATABASE, &X, NULL);
+}
+
 //////////////////////// CALL statement ////////////////////////////////////
 //
 cmd ::= call.

query_classifier/qc_sqlite/sqlite-src-3110100/src/sqliteInt.h

@@ -4094,6 +4094,7 @@ int sqlite3DbstatRegister(sqlite3*);
 
 typedef enum mxs_drop
 {
+    MXS_DROP_DATABASE,
     MXS_DROP_FUNCTION,
     MXS_DROP_SEQUENCE,
 } mxs_drop_t;

query_classifier/qc_sqlite/sqlite-src-3110100/tool/mkkeywordhash.c

@@ -216,8 +216,10 @@ static Keyword aKeywordTable[] = {
   { "CURRENT_TIMESTAMP","TK_CTIME_KW",     ALWAYS                 },
 #ifdef MAXSCALE
   { "DATA",             "TK_DATA",         ALWAYS                 },
-#endif
+  { "DATABASE",         "TK_DATABASE",     ALWAYS                 },
+#else
   { "DATABASE",         "TK_DATABASE",     ATTACH                 },
+#endif
 #ifdef MAXSCALE
   { "DATABASES",        "TK_DATABASES_KW", ALWAYS                 },
   { "DEALLOCATE",       "TK_DEALLOCATE",   ALWAYS                 },