[TD-3158]<fix>: replace head_type with column_meta in http response

src/plugins/http/inc/httpRestJson.h

@@ -34,8 +34,8 @@
 #define REST_JSON_DATA_LEN       4
 #define REST_JSON_HEAD           "head"
 #define REST_JSON_HEAD_LEN       4
-#define REST_JSON_HEAD_TYPE      "head_type"
-#define REST_JSON_HEAD_TYPE_LEN  9
+#define REST_JSON_HEAD_INFO      "column_meta"
+#define REST_JSON_HEAD_INFO_LEN  11
 #define REST_JSON_ROWS           "rows"
 #define REST_JSON_ROWS_LEN       4
 #define REST_JSON_AFFECT_ROWS    "affected_rows"

src/plugins/http/src/httpRestJson.c

@@ -75,24 +75,42 @@ void restStartSqlJson(HttpContext *pContext, HttpSqlCmd *cmd, TAOS_RES *result)
   // head array end
   httpJsonToken(jsonBuf, JsonArrEnd);
 
-  // head_type begin
+  // column_meta begin
   httpJsonItemToken(jsonBuf);
-  httpJsonPairHead(jsonBuf, REST_JSON_HEAD_TYPE, REST_JSON_HEAD_TYPE_LEN);
-  // head_type array begin
+  httpJsonPairHead(jsonBuf, REST_JSON_HEAD_INFO, REST_JSON_HEAD_INFO_LEN);
+  // column_meta array begin
   httpJsonItemToken(jsonBuf);
   httpJsonToken(jsonBuf, JsonArrStt);
 
   if (num_fields == 0) {
+    httpJsonItemToken(jsonBuf);
+    httpJsonToken(jsonBuf, JsonArrStt);
+
+    httpJsonItemToken(jsonBuf);
+    httpJsonString(jsonBuf, REST_JSON_AFFECT_ROWS, REST_JSON_AFFECT_ROWS_LEN);
     httpJsonItemToken(jsonBuf);
     httpJsonInt(jsonBuf, TSDB_DATA_TYPE_INT);
+    httpJsonItemToken(jsonBuf);
+    httpJsonInt(jsonBuf, 4);
+
+    httpJsonToken(jsonBuf, JsonArrEnd);
   } else {
     for (int32_t i = 0; i < num_fields; ++i) {
+      httpJsonItemToken(jsonBuf);
+      httpJsonToken(jsonBuf, JsonArrStt);
+
+      httpJsonItemToken(jsonBuf);
+      httpJsonString(jsonBuf, fields[i].name, (int32_t)strlen(fields[i].name));
       httpJsonItemToken(jsonBuf);
       httpJsonInt(jsonBuf, fields[i].type);
+      httpJsonItemToken(jsonBuf);
+      httpJsonInt(jsonBuf, fields[i].bytes);
+
+      httpJsonToken(jsonBuf, JsonArrEnd);
     }
   }
 
-  // head_type array end
+  // column_meta array end
   httpJsonToken(jsonBuf, JsonArrEnd);
 
   // data begin