test(stage): test select from external stage.

Author: youngsofun

tests/suites/0_stateless/20+_others/20_0011_select_stage.result

@@ -4,3 +4,6 @@
 --- uri
 1	2	3
 4	5	6
+--- external stage
+1	2	3
+4	5	6

tests/suites/0_stateless/20+_others/20_0011_select_stage.sh

@@ -19,4 +19,10 @@ rm -rf ${DATADIR_PATH}
 DATADIR="fs://$DATADIR_PATH/"
 echo "copy into '${DATADIR}' from t1 FILE_FORMAT = (type = 'PARQUET');" | $MYSQL_CLIENT_CONNECT
 echo "select * from '${DATADIR}';" | $MYSQL_CLIENT_CONNECT
-rm -rf ${DATADIR_PATH}
+
+echo '--- external stage'
+echo "drop stage if exists s2;" | $MYSQL_CLIENT_CONNECT
+echo "create stage s2 url = '${DATADIR}';" | $MYSQL_CLIENT_CONNECT
+echo "select * from @s2;" | $MYSQL_CLIENT_CONNECT
+
+rm -rf ${DATADIR_PATH}