[TD-4096]<feature> support 'show create stable xx'

src/client/src/tscLocal.c

@@ -326,6 +326,7 @@ TAOS_ROW tscFetchRow(void *param) {
        pCmd->command == TSDB_SQL_FETCH ||
        pCmd->command == TSDB_SQL_SHOW ||
        pCmd->command == TSDB_SQL_SHOW_CREATE_TABLE ||
+       pCmd->command == TSDB_SQL_SHOW_CREATE_STABLE ||
        pCmd->command == TSDB_SQL_SHOW_CREATE_DATABASE ||
        pCmd->command == TSDB_SQL_SELECT ||
        pCmd->command == TSDB_SQL_DESCRIBE_TABLE ||
@@ -679,6 +680,9 @@ static int32_t tscProcessShowCreateTable(SSqlObj *pSql) {
   assert(pTableMetaInfo->pTableMeta != NULL);
 
   const char* tableName = tNameGetTableName(&pTableMetaInfo->name);
+  if (pSql->cmd.command == TSDB_SQL_SHOW_CREATE_STABLE && !UTIL_TABLE_IS_SUPER_TABLE(pTableMetaInfo))  {
+    return TSDB_CODE_TSC_INVALID_VALUE;
+  }
 
   char *result = (char *)calloc(1, TSDB_MAX_BINARY_LEN);
   int32_t code = TSDB_CODE_SUCCESS;
@@ -907,7 +911,7 @@ int tscProcessLocalCmd(SSqlObj *pSql) {
      */
     pRes->qId = 0x1;
     pRes->numOfRows = 0;
-  } else if (pCmd->command == TSDB_SQL_SHOW_CREATE_TABLE) {
+  } else if (pCmd->command == TSDB_SQL_SHOW_CREATE_TABLE || pCmd->command == TSDB_SQL_SHOW_CREATE_STABLE) {
     pRes->code = tscProcessShowCreateTable(pSql); 
   } else if (pCmd->command == TSDB_SQL_SHOW_CREATE_DATABASE) {
     pRes->code = tscProcessShowCreateDatabase(pSql); 

src/client/src/tscSQLParser.c

@@ -446,6 +446,7 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
 
       return tscGetTableMeta(pSql, pTableMetaInfo);
     }
+    case TSDB_SQL_SHOW_CREATE_STABLE:                           
     case TSDB_SQL_SHOW_CREATE_TABLE: {
       const char* msg1 = "invalid table name";
       const char* msg2 = "table name is too long";

src/client/src/tscServer.c

@@ -2641,6 +2641,7 @@ void tscInitMsgsFp() {
   tscProcessMsgRsp[TSDB_SQL_ALTER_DB] = tscProcessAlterDbMsgRsp;
 
   tscProcessMsgRsp[TSDB_SQL_SHOW_CREATE_TABLE] = tscProcessShowCreateRsp;
+  tscProcessMsgRsp[TSDB_SQL_SHOW_CREATE_STABLE] = tscProcessShowCreateRsp;
   tscProcessMsgRsp[TSDB_SQL_SHOW_CREATE_DATABASE] = tscProcessShowCreateRsp;
 
   tscKeepConn[TSDB_SQL_SHOW] = 1;

src/client/src/tscSql.c

@@ -457,6 +457,7 @@ static bool needToFetchNewBlock(SSqlObj* pSql) {
           pCmd->command == TSDB_SQL_FETCH ||
           pCmd->command == TSDB_SQL_SHOW ||
           pCmd->command == TSDB_SQL_SHOW_CREATE_TABLE ||
+          pCmd->command == TSDB_SQL_SHOW_CREATE_STABLE ||
           pCmd->command == TSDB_SQL_SHOW_CREATE_DATABASE ||
           pCmd->command == TSDB_SQL_SELECT ||
           pCmd->command == TSDB_SQL_DESCRIBE_TABLE ||

src/common/inc/tcmdtype.h

@@ -80,6 +80,7 @@ enum {
   TSDB_DEFINE_SQL_TYPE( TSDB_SQL_TABLE_JOIN_RETRIEVE, "join-retrieve" )
 
   TSDB_DEFINE_SQL_TYPE( TSDB_SQL_SHOW_CREATE_TABLE, "show-create-table")
+  TSDB_DEFINE_SQL_TYPE( TSDB_SQL_SHOW_CREATE_STABLE, "show-create-stable")
   TSDB_DEFINE_SQL_TYPE( TSDB_SQL_SHOW_CREATE_DATABASE, "show-create-database")
 
   /*

src/query/inc/sql.y

@@ -94,6 +94,10 @@ cmd ::= SHOW CREATE TABLE ids(X) cpxName(Y).    {
    X.n += Y.n;
    setDCLSqlElems(pInfo, TSDB_SQL_SHOW_CREATE_TABLE, 1, &X);
 }    
+cmd ::= SHOW CREATE STABLE ids(X) cpxName(Y).    {
+   X.n += Y.n;
+   setDCLSqlElems(pInfo, TSDB_SQL_SHOW_CREATE_STABLE, 1, &X);
+}    
 
 cmd ::= SHOW CREATE DATABASE ids(X). {
   setDCLSqlElems(pInfo, TSDB_SQL_SHOW_CREATE_DATABASE, 1, &X);