Merge remote-tracking branch 'origin/v1.8.0_dev_feature_impala' into v1.8.0_dev

# Conflicts:
#	README.md

Author: simenliuxing

docs/impalaSide.md

@@ -89,6 +89,8 @@ create table sideTable(
 
 ## 6.分区样例
 
+注：分区字段放在最后面，如下，name是分区字段，放在channel，xccount字段的后面
+
 ```
 create table sideTable(
     channel varchar,

impala/impala-side/impala-async-side/src/main/java/com/dtstack/flink/sql/side/impala/ImpalaAsyncReqRow.java

@@ -77,9 +77,9 @@ public JsonObject getClientConfig() {
                 .put("driver_class", IMPALA_DRIVER)
                 .put("max_pool_size", DEFAULT_MAX_DB_CONN_POOL_SIZE)
                 .put("provider_class", DT_PROVIDER_CLASS)
-                .put("preferred_test_query", PREFERRED_TEST_QUERY_SQL)
-                .put("idle_connection_test_period", DEFAULT_IDLE_CONNECTION_TEST_PEROID)
-                .put("test_connection_on_checkin", DEFAULT_TEST_CONNECTION_ON_CHECKIN);
+                .put("idle_connection_test_period", 300)
+                .put("test_connection_on_checkin", DEFAULT_TEST_CONNECTION_ON_CHECKIN)
+                .put("max_idle_time", 600);
 
         return impalaClientConfig;
     }