Github user amansinha100 commented on a diff in the pull request:
https://github.com/apache/drill/pull/1110#discussion_r167447863
--- Diff:
exec/java-exec/src/test/java/org/apache/drill/exec/physical/impl/TestOrderedMuxExchange.java
---
@@ -0,0 +1,116 @@
+/**
+ * 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.impl;
+
+import org.apache.drill.PlanTestBase;
+import org.apache.drill.common.expression.ExpressionPosition;
+import org.apache.drill.common.expression.SchemaPath;
+import org.apache.drill.exec.ExecConstants;
+import org.apache.drill.exec.exception.SchemaChangeException;
+import org.apache.drill.exec.memory.BufferAllocator;
+import org.apache.drill.exec.record.RecordBatchLoader;
+import org.apache.drill.exec.rpc.user.QueryDataBatch;
+import org.apache.drill.exec.vector.IntVector;
+import org.apache.drill.test.ClusterFixture;
+import org.apache.drill.test.ClusterFixtureBuilder;
+import org.apache.drill.test.ClientFixture;
+import org.junit.Test;
+
+import java.util.List;
+
+import static org.junit.Assert.assertTrue;
+
+public class TestOrderedMuxExchange extends PlanTestBase {
+
+ private final static String ORDERED_MUX_EXCHANGE = "OrderedMuxExchange";
+
+
+ private void validateResults(BufferAllocator allocator,
List<QueryDataBatch> results) throws SchemaChangeException {
+ long previousBigInt = Long.MIN_VALUE;
+
+ for (QueryDataBatch b : results) {
+ RecordBatchLoader loader = new RecordBatchLoader(allocator);
+ if (b.getHeader().getRowCount() > 0) {
+ loader.load(b.getHeader().getDef(),b.getData());
+ @SuppressWarnings({ "deprecation", "resource" })
+ IntVector c1 = (IntVector)
loader.getValueAccessorById(IntVector.class,
+ loader.getValueVectorId(new SchemaPath("id_i",
ExpressionPosition.UNKNOWN)).getFieldIds()).getValueVector();
+ IntVector.Accessor a1 = c1.getAccessor();
+
+ for (int i = 0; i < c1.getAccessor().getValueCount(); i++) {
+ assertTrue(String.format("%d > %d", previousBigInt, a1.get(i)),
previousBigInt <= a1.get(i));
+ previousBigInt = a1.get(i);
+ }
+ }
+ loader.clear();
+ b.release();
+ }
+ }
+
+ /**
+ * Test case to verify the OrderedMuxExchange created for order by
clause.
+ * It checks by forcing the plan to create OrderedMuxExchange and also
verifies the
+ * output column is ordered.
+ *
+ * @throws Exception if anything goes wrong
+ */
+
+ @Test
+ public void testOrderedMuxForOrderBy() throws Exception {
+ ClusterFixtureBuilder builder = ClusterFixture.builder(dirTestWatcher)
+ .maxParallelization(1)
+
.configProperty(ExecConstants.SYS_STORE_PROVIDER_LOCAL_ENABLE_WRITE, true)
+ ;
+
+ try (ClusterFixture cluster = builder.build();
+ ClientFixture client = cluster.clientFixture()) {
+ client.alterSession(ExecConstants.SLICE_TARGET, 10);
+ String sql = "SELECT id_i, name_s10 FROM `mock`.`employees_10K`
ORDER BY id_i limit 10";
--- End diff --
I am not sure how the table is organized..does it have already ordered id_i
column ? if so, we should use a different column.
---
