fix: fix show create table crash issue

include/libs/nodes/cmdnodes.h

@@ -34,7 +34,7 @@ extern "C" {
 
 #define SHOW_CREATE_TB_RESULT_COLS       2
 #define SHOW_CREATE_TB_RESULT_FIELD1_LEN (TSDB_TABLE_NAME_LEN + VARSTR_HEADER_SIZE)
-#define SHOW_CREATE_TB_RESULT_FIELD2_LEN (TSDB_MAX_BINARY_LEN + VARSTR_HEADER_SIZE)
+#define SHOW_CREATE_TB_RESULT_FIELD2_LEN (TSDB_MAX_ALLOWED_SQL_LEN * 3)
 
 #define SHOW_LOCAL_VARIABLES_RESULT_COLS       2
 #define SHOW_LOCAL_VARIABLES_RESULT_FIELD1_LEN (TSDB_CONFIG_OPTION_LEN + VARSTR_HEADER_SIZE)

source/libs/command/src/command.c

@@ -496,7 +496,12 @@ static int32_t setCreateTBResultIntoDataBlock(SSDataBlock* pBlock, SDbCfgInfo* p
   colDataAppend(pCol1, 0, buf1, false);
 
   SColumnInfoData* pCol2 = taosArrayGet(pBlock->pDataBlock, 1);
-  char             buf2[SHOW_CREATE_TB_RESULT_FIELD2_LEN] = {0};
+  char*            buf2 = taosMemoryMalloc(SHOW_CREATE_TB_RESULT_FIELD2_LEN);
+  if (NULL == buf2) {
+    terrno = TSDB_CODE_TSC_OUT_OF_MEMORY;
+    return terrno;
+  }
+  
   int32_t          len = 0;
 
   if (TSDB_SUPER_TABLE == pCfg->tableType) {
@@ -512,6 +517,7 @@ static int32_t setCreateTBResultIntoDataBlock(SSDataBlock* pBlock, SDbCfgInfo* p
     len += sprintf(buf2 + VARSTR_HEADER_SIZE + len, ") TAGS (");
     code = appendTagValues(buf2, &len, pCfg);
     if (code) {
+      taosMemoryFree(buf2);
       return code;
     }
     len += sprintf(buf2 + VARSTR_HEADER_SIZE + len, ")");
@@ -527,6 +533,8 @@ static int32_t setCreateTBResultIntoDataBlock(SSDataBlock* pBlock, SDbCfgInfo* p
 
   colDataAppend(pCol2, 0, buf2, false);
 
+  taosMemoryFree(buf2);
+  
   return TSDB_CODE_SUCCESS;
 }