Fixed json parsing

mysql_ch_replicator/pymysqlreplication/packet.py

@@ -347,7 +347,7 @@ def read_binary_json(self, size, is_partial):
             # handle NULL value
             return None
         data = self.read(length)
-        return cpp_mysql_to_json(data)
+        return cpp_mysql_to_json(data).decode('utf-8')
 
         #
         # if is_partial:

test_mysql_ch_replicator.py

@@ -2,6 +2,7 @@
 import shutil
 import time
 import subprocess
+import json
 
 from mysql_ch_replicator import config
 from mysql_ch_replicator import mysql_api
@@ -646,3 +647,59 @@ def test_numeric_types_and_limits():
     assert_wait(lambda: len(ch.select(TEST_TABLE_NAME, 'test6=4294967290')) == 1)
     assert_wait(lambda: len(ch.select(TEST_TABLE_NAME, 'test6=4294967280')) == 1)
     assert_wait(lambda: len(ch.select(TEST_TABLE_NAME, 'test7=18446744073709551586')) == 2)
+
+
+def test_json():
+    cfg = config.Settings()
+    cfg.load(CONFIG_FILE)
+
+    mysql = mysql_api.MySQLApi(
+        database=None,
+        mysql_settings=cfg.mysql,
+    )
+
+    ch = clickhouse_api.ClickhouseApi(
+        database=TEST_DB_NAME,
+        clickhouse_settings=cfg.clickhouse,
+    )
+
+    prepare_env(cfg, mysql, ch)
+
+    mysql.execute("SET sql_mode = 'ALLOW_INVALID_DATES';")
+
+    mysql.execute(f'''
+CREATE TABLE {TEST_TABLE_NAME} (
+    `id` int unsigned NOT NULL AUTO_INCREMENT,
+    name varchar(255),
+    data json,
+    PRIMARY KEY (id)
+); 
+    ''')
+
+    mysql.execute(
+        f"INSERT INTO {TEST_TABLE_NAME} (name, data) VALUES " +
+        """('Ivan', '{"a": "b", "c": [1,2,3]}');""",
+        commit=True,
+    )
+
+    binlog_replicator_runner = BinlogReplicatorRunner()
+    binlog_replicator_runner.run()
+    db_replicator_runner = DbReplicatorRunner(TEST_DB_NAME)
+    db_replicator_runner.run()
+
+    assert_wait(lambda: TEST_DB_NAME in ch.get_databases())
+
+    ch.execute_command(f'USE {TEST_DB_NAME}')
+
+    assert_wait(lambda: TEST_TABLE_NAME in ch.get_tables())
+    assert_wait(lambda: len(ch.select(TEST_TABLE_NAME)) == 1)
+
+    mysql.execute(
+        f"INSERT INTO {TEST_TABLE_NAME} (name, data) VALUES " +
+        """('Peter', '{"b": "b", "c": [3,2,1]}');""",
+        commit=True,
+    )
+    assert_wait(lambda: len(ch.select(TEST_TABLE_NAME)) == 2)
+
+    assert json.loads(ch.select(TEST_TABLE_NAME, "name='Ivan'")[0]['data'])['c'] == [1, 2, 3]
+    assert json.loads(ch.select(TEST_TABLE_NAME, "name='Peter'")[0]['data'])['c'] == [3, 2, 1]