Github user arina-ielchiieva commented on a diff in the pull request:
https://github.com/apache/drill/pull/1083#discussion_r160524662
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/physical/base/SchemalessScan.java
---
@@ -0,0 +1,80 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to you under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.drill.exec.physical.base;
+
+import com.fasterxml.jackson.annotation.JsonTypeName;
+import com.google.common.base.Preconditions;
+import org.apache.drill.common.exceptions.ExecutionSetupException;
+import org.apache.drill.common.expression.SchemaPath;
+import org.apache.drill.exec.physical.PhysicalOperatorSetupException;
+import org.apache.drill.exec.planner.logical.DynamicDrillTable;
+import org.apache.drill.exec.proto.CoordinationProtos;
+
+import java.util.List;
+
+/**
+ * The type of scan operator, which allows to scan schemaless tables
({@link DynamicDrillTable} with null selection)
+ */
+@JsonTypeName("schemaless-scan")
+public class SchemalessScan extends AbstractGroupScan implements SubScan {
+
+ public SchemalessScan(String userName) {
+ super(userName);
+ }
+
+ public SchemalessScan(AbstractGroupScan that) {
+ super(that);
+ }
+
+ @Override
+ public void applyAssignments(List<CoordinationProtos.DrillbitEndpoint>
endpoints) throws PhysicalOperatorSetupException {
+ }
+
+ @Override
+ public SubScan getSpecificScan(int minorFragmentId) throws
ExecutionSetupException {
+ return this;
+ }
+
+ @Override
+ public int getMaxParallelizationWidth() {
+ return 1;
+ }
+
+ @Override
+ public String getDigest() {
+ return toString();
--- End diff --
What value `toString` will return?
---
