[Performance Optimization] Remove push down conjuncts in olap scan node (#4999)

Push conjunct to Storage Engine as more as possible

olap scan node do not need filter data use push down conjuncts again.

fix #4986

fe/fe-core/src/main/java/org/apache/doris/planner/OlapScanNode.java

@@ -630,6 +630,7 @@ public class OlapScanNode extends ScanNode {
         if (null != sortColumn) {
             msg.olap_scan_node.setSortColumn(sortColumn);
         }
+	msg.olap_scan_node.setKeyType(olapTable.getKeysType().toThrift());
     }
 
     // export some tablets