fix: [6719658649] Fix wrong show create virtual table output. (#34360)

Author: Simon9997

source/libs/command/src/command.c

@@ -642,6 +642,7 @@ static void appendColumnFields(char* buf, int32_t* len, STableCfg* pCfg) {
 
 static void appendColRefFields(char* buf, int32_t* len, STableCfg* pCfg) {
   char expandName[(SHOW_CREATE_TB_RESULT_FIELD1_LEN << 1) + 1] = {0};
+  bool firstRef = true;
   for (int32_t i = 1; i < pCfg->numOfColumns; ++i) {
     SSchema* pSchema = pCfg->pSchemas + i;
     SColRef* pRef = pCfg->pColRefs + i;
@@ -659,8 +660,11 @@ static void appendColRefFields(char* buf, int32_t* len, STableCfg* pCfg) {
     }
 
     *len += tsnprintf(buf + VARSTR_HEADER_SIZE + *len, SHOW_CREATE_TB_RESULT_FIELD2_LEN - (VARSTR_HEADER_SIZE + *len),
-                      "%s`%s` %s", ((i > 1) ? ", " : ""), expandIdentifier(pSchema->name, expandName), type);
-
+                      "%s`%s` %s", (!firstRef ? ", " : " ("), expandIdentifier(pSchema->name, expandName), type);
+    firstRef = false;
+  }
+  if (!firstRef) {
+    *len += tsnprintf(buf + VARSTR_HEADER_SIZE + *len, SHOW_CREATE_TB_RESULT_FIELD2_LEN - (VARSTR_HEADER_SIZE + *len), ")");
   }
 }
 
@@ -929,10 +933,10 @@ static int32_t setCreateTBResultIntoDataBlock(SSDataBlock* pBlock, SDbCfgInfo* p
         snprintf(buf2 + VARSTR_HEADER_SIZE + len, SHOW_CREATE_TB_RESULT_FIELD2_LEN - (VARSTR_HEADER_SIZE + len), ")");
   } else if (TSDB_VIRTUAL_CHILD_TABLE == pCfg->tableType) {
     len += tsnprintf(buf2 + VARSTR_HEADER_SIZE, SHOW_CREATE_TB_RESULT_FIELD2_LEN - VARSTR_HEADER_SIZE,
-                     "CREATE VTABLE `%s` (", expandIdentifier(tbName, buf1));
+                     "CREATE VTABLE `%s`", expandIdentifier(tbName, buf1));
     appendColRefFields(buf2, &len, pCfg);
     len += snprintf(buf2 + VARSTR_HEADER_SIZE + len, SHOW_CREATE_TB_RESULT_FIELD2_LEN - (VARSTR_HEADER_SIZE + len),
-                    ") USING `%s` (", expandIdentifier(pCfg->stbName, buf1));
+                    " USING `%s` (", expandIdentifier(pCfg->stbName, buf1));
     appendTagNameFields(buf2, &len, pCfg);
     len += tsnprintf(buf2 + VARSTR_HEADER_SIZE + len, SHOW_CREATE_TB_RESULT_FIELD2_LEN - (VARSTR_HEADER_SIZE + len),
                      ") TAGS (");