From 9784eb618d030b95cd0490ba7d27e21a543fac7e Mon Sep 17 00:00:00 2001
From: xywang <xywang@taosdata.com>
Date: Tue, 15 Jun 2021 19:49:51 +0800
Subject: [PATCH] [TD-4721]<fix>: NULL column in a row was specially processed

---
 src/plugins/http/src/httpGcJson.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/plugins/http/src/httpGcJson.c b/src/plugins/http/src/httpGcJson.c
index 8c223a1500..397791706d 100644
--- a/src/plugins/http/src/httpGcJson.c
+++ b/src/plugins/http/src/httpGcJson.c
@@ -133,6 +133,16 @@ bool gcBuildQueryJson(HttpContext *pContext, HttpSqlCmd *cmd, TAOS_RES *result,
       int32_t len;
       len = snprintf(target, HTTP_GC_TARGET_SIZE, "%s{", aliasBuffer);
       for (int32_t i = dataFields + 1; i < num_fields; i++) {
+        if (row[i] == NULL) {
+          len += snprintf(target + len, HTTP_GC_TARGET_SIZE - len, "%s:nil", fields[i].name);
+
+          if (i < num_fields - 1) {
+            len += snprintf(target + len, HTTP_GC_TARGET_SIZE - len, ", ");
+          }
+
+          continue;
+        }
+
         switch (fields[i].type) {
           case TSDB_DATA_TYPE_BOOL:
           case TSDB_DATA_TYPE_TINYINT:
-- 
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