sql_yacc.yy:

  Add DISCARD etc. in the keyword: rule of sql_yacc.yy
sql_table.cc:
  Add comment that DISCARD/IMPORT TABLESPACE is always the only clause in an ALTER TABLE


sql/sql_table.cc:
  Add comment that DISCARD/IMPORT TABLESPACE is always the only clause in an ALTER TABLE
sql/sql_yacc.yy:
  Add DISCARD etc. in the keyword: rule of sql_yacc.yy

sql/sql_table.cc

@@ -1779,8 +1779,6 @@ int mysql_discard_or_import_tablespace(THD *thd,
     DBUG_RETURN(-1);
   }
   
-  thd->tablespace_op=FALSE;
-
   error=table->file->discard_or_import_tablespace(discard);
 
   thd->proc_info="end";
@@ -1806,6 +1804,7 @@ int mysql_discard_or_import_tablespace(THD *thd,
   }
 err:
   close_thread_tables(thd);
+  thd->tablespace_op=FALSE;
   if (error == 0) {
     send_ok(thd);
    DBUG_RETURN(0);
@@ -1848,6 +1847,7 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name,
 
   mysql_ha_closeall(thd, table_list);
 
+  /* DISCARD/IMPORT TABLESPACE is always alone in an ALTER TABLE */
   if (tablespace_op != NO_TABLESPACE_OP)
     DBUG_RETURN(mysql_discard_or_import_tablespace(thd,table_list,
 							tablespace_op));

sql/sql_yacc.yy

@@ -4515,6 +4515,7 @@ keyword:
 	| DELAY_KEY_WRITE_SYM	{}
 	| DES_KEY_FILE		{}
 	| DIRECTORY_SYM		{}
+	| DISCARD		{}
 	| DO_SYM		{}
 	| DUAL_SYM		{}
 	| DUMPFILE		{}
@@ -4546,6 +4547,7 @@ keyword:
 	| HOSTS_SYM		{}
 	| HOUR_SYM		{}
 	| IDENTIFIED_SYM	{}
+	| IMPORT		{}
 	| INDEXES		{}
 	| ISOLATION		{}
 	| ISAM_SYM		{}
@@ -4654,6 +4656,7 @@ keyword:
 	| SUBDATE_SYM		{}
 	| SUBJECT_SYM		{}
 	| SUPER_SYM		{}
+	| TABLESPACE		{}
 	| TEMPORARY		{}
 	| TEXT_SYM		{}
 	| TRANSACTION_SYM	{}