fix allowDistributeScan default value

Author: maochongxin

src/main/java/com/alipay/oceanbase/rpc/protocol/payload/impl/execute/syncquery/ObTableQueryAsyncRequest.java

@@ -40,7 +40,7 @@ public class ObTableQueryAsyncRequest extends ObTableAbstractOperationRequest {
     private long                 querySessionId;
     private ObQueryOperationType queryType = ObQueryOperationType.QUERY_START;
 
-    private boolean              allowDistributeScan;
+    private boolean              allowDistributeScan = true;
 
     /**
      * Get pcode.

src/main/java/com/alipay/oceanbase/rpc/table/ObTableClientQueryImpl.java

@@ -50,7 +50,7 @@ public class ObTableClientQueryImpl extends AbstractTableQueryImpl {
 
     private Row                                   rowKey;             // only used by BatchOperation
 
-    private boolean                               allowDistributeScan;
+    private boolean                               allowDistributeScan = true;
 
     /*
      * Add aggregation.