[add cases]

tests/script/tsim/show/basic.sim

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+system sh/stop_dnodes.sh
+system sh/deploy.sh -n dnode1 -i 1
+system sh/deploy.sh -n dnode2 -i 2
+system sh/exec.sh -n dnode1 -s start
+system sh/exec.sh -n dnode2 -s start
+
+# after mnode support, del sleep 2000, and check dnode status
+sleep 2000
+sql connect
+
+#$loop_cnt = 0
+#check_dnode_ready:
+#	$loop_cnt = $loop_cnt + 1
+#	sleep 200
+#	if $loop_cnt == 10 then
+#	  print ====> dnode not ready!
+#		return -1
+#	endi
+#sql show dnodes
+#print ===> $rows $data00 $data01 $data02 $data03 $data04 $data05
+#if $data00 != 1 then
+#  return -1
+#endi
+#if $data04 != ready then
+#  goto check_dnode_ready
+#endi
+#sql connect
+
+# select */column from information_schema.xxxx; xxxx include:
+# dnodes, mnodes, modules, qnodes, 
+# user_databases, user_functions, user_indexes, user_stables, user_streams, 
+# user_tables, user_table_distributed, user_users, vgroups, 
+
+print =============== add dnode2 into cluster
+sql create dnode $hostname port 7200
+sql create database db vgroups 3
+sql use db
+sql create table stb (ts timestamp, c int) tags (t int)
+sql create table t0 using stb tags (0)
+
+
+sql show dnodes
+if $rows != 2 then 
+  return -1
+endi
+
+sql show mnodes
+if $rows != 1 then 
+  return -1
+endi
+#sql show modules
+#sql show qnodes
+sql show databases
+if $rows != 2 then 
+  return -1
+endi
+#sql show functions
+
+#sql show indexes
+sql show stables
+if $rows != 1 then 
+  return -1
+endi
+#sql show streams, 
+sql show tables
+if $rows != 1 then 
+  return -1
+endi
+#sql show user_table_distributed
+sql show users
+if $rows != 1 then 
+  return -1
+endi
+sql show vgroups
+if $rows != 3 then 
+  return -1
+endi
+
+
+
+#sql select * from information_schema.dnodes
+#if $rows != 2 then 
+#  return -1
+#endi
+#sql select * from information_schema.mnodes
+#if $rows != 1 then 
+#  return -1
+#endi
+#sql select * from information_schema.modules
+#sql select * from information_schema.qnodes 
+sql select * from information_schema.user_databases
+if $rows != 2 then 
+  return -1
+endi
+#sql select * from information_schema.user_functions
+#sql select * from information_schema.user_indexes
+sql select * from information_schema.user_stables
+if $rows != 1 then 
+  return -1
+endi
+#sql select * from information_schema.user_streams 
+sql select * from information_schema.user_tables
+if $rows != 1 then 
+  return -1
+endi
+#sql select * from information_schema.user_table_distributed
+sql select * from information_schema.user_users
+if $rows != 1 then 
+  return -1
+endi
+#sql select * from information_schema.vgroups
+#if $rows != 3 then 
+#  return -1
+#endi
+
+print ==== stop dnode1 and dnode2, and restart dnodes
+system sh/exec.sh -n dnode1 -s stop -x SIGINT
+system sh/exec.sh -n dnode2 -s stop -x SIGINT
+system sh/exec.sh -n dnode1 -s start
+system sh/exec.sh -n dnode2 -s start
+
+$loop_cnt = 0
+check_dnode_ready:
+	$loop_cnt = $loop_cnt + 1
+	sleep 200
+	if $loop_cnt == 10 then
+	  print ====> dnode not ready!
+		return -1
+	endi
+sql show dnodes
+print ===> $rows $data00 $data01 $data02 $data03 $data04 $data05
+if $data00 != 1 then
+  return -1
+endi
+if $data04 != ready then
+  goto check_dnode_ready
+endi
+
+print ==== again run show / select of above
+
+#system sh/exec.sh -n dnode1 -s stop -x SIGINT