[regression-test](load) add something like $.tag.[a.b] key's json case (

#35134)

regression-test/data/load_p0/stream_load/test_json_load.out

@@ -245,3 +245,6 @@ John	30	New York	{"email":"[email protected]","phone":"+1-123-456-7890"}
 android	\N	\N	\N	\N	\N
 android	\N	\N	\N	\N	\N
 
+-- !select28 --
+test	k2_value
+

regression-test/data/load_p0/stream_load/test_special_key_json.json

@@ -0,0 +1 @@
+{"tags": {"a.b": "test","k2": "k2_value"}}

regression-test/suites/load_p0/stream_load/test_json_load.groovy

@@ -827,4 +827,30 @@ suite("test_json_load", "p0") {
     } finally {
         try_sql("DROP TABLE IF EXISTS ${testTable}")
     }
+
+    // add something like $.tag. [a.b] key's json case
+    try {
+        sql "DROP TABLE IF EXISTS ${testTable}"
+        sql """CREATE TABLE IF NOT EXISTS ${testTable} 
+            (
+                `k1` varchar(1024) NULL,
+                `k2` varchar(1024) NULL
+            )
+            DUPLICATE KEY(`k1`)
+            COMMENT ''
+            DISTRIBUTED BY RANDOM BUCKETS 1
+            PROPERTIES (
+            "replication_allocation" = "tag.location.default: 1"
+            );"""
+
+        load_json_data.call("${testTable}", "${testTable}_case28_1", 'false', '', 'json', '', '[\"$.tags.\\\"a.b\\\"\",\"$.tags.k2\"]',
+                             '', '', '', 'test_special_key_json.json')
+
+        sql "sync"
+        sleep(1000)
+        qt_select28 "select * from ${testTable}"
+
+    } finally {
+        try_sql("DROP TABLE IF EXISTS ${testTable}")
+    }
 }