| /* |
| * 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.test; |
| |
| import org.apache.drill.common.exceptions.UserException; |
| import org.apache.drill.exec.memory.BufferAllocator; |
| import org.apache.drill.exec.physical.resultSet.impl.PullResultSetReaderImpl.UpstreamSource; |
| import org.apache.drill.exec.proto.UserBitShared.QueryId; |
| import org.apache.drill.exec.proto.UserBitShared.QueryResult.QueryState; |
| import org.apache.drill.exec.proto.helper.QueryIdHelper; |
| import org.apache.drill.exec.record.RecordBatchLoader; |
| import org.apache.drill.exec.record.VectorContainer; |
| import org.apache.drill.exec.record.selection.SelectionVector2; |
| import org.apache.drill.exec.rpc.user.QueryDataBatch; |
| import org.apache.drill.shaded.guava.com.google.common.base.Preconditions; |
| import org.apache.drill.test.BufferingQueryEventListener.QueryEvent; |
| |
| /** |
| * Iterator over batches returned from a query. Uses a listener to obtain |
| * the serialized batches, then decodes them into value vectors held |
| * in a vector container - the same structure as used in the query |
| * executor. This format allows us to use the "row set" classes on the |
| * output of the query. |
| */ |
| public class QueryBatchIterator implements UpstreamSource, AutoCloseable { |
| |
| private enum State { START, RUN, RETAIN, EOF } |
| |
| private final BufferingQueryEventListener listener; |
| private final RecordBatchLoader loader; |
| private State state = State.START; |
| private boolean retainData; |
| private QueryId queryId; |
| private QueryState queryState; |
| private int schemaVersion; |
| private int recordCount; |
| private int batchCount; |
| |
| public QueryBatchIterator(BufferAllocator allocator, BufferingQueryEventListener listener) { |
| this.listener = listener; |
| this.loader = new RecordBatchLoader(allocator); |
| } |
| |
| public QueryId queryId() { return queryId; } |
| public String queryIdString() { return QueryIdHelper.getQueryId(queryId); } |
| public QueryState finalState() { return queryState; } |
| public int batchCount() { return batchCount; } |
| public int rowCount() { return recordCount; } |
| |
| @Override |
| public boolean next() { |
| retainData = false; |
| if (state == State.EOF) { |
| return false; |
| } |
| while (true) { |
| QueryEvent event = listener.get(); |
| queryState = event.state; |
| switch (event.type) { |
| case BATCH: |
| |
| // Skip over null batches |
| if (loadBatch(event)) { |
| return true; |
| } |
| break; |
| case EOF: |
| state = State.EOF; |
| return false; |
| case ERROR: |
| state = State.EOF; |
| if (event.error instanceof UserException) { |
| throw (UserException) event.error; |
| } else { |
| throw new RuntimeException(event.error); |
| } |
| case QUERY_ID: |
| queryId = event.queryId; |
| break; |
| default: |
| throw new IllegalStateException("Unexpected event: " + event.type); |
| } |
| } |
| } |
| |
| private boolean loadBatch(QueryEvent event) { |
| batchCount++; |
| recordCount += event.batch.getHeader().getRowCount(); |
| QueryDataBatch inputBatch = Preconditions.checkNotNull(event.batch); |
| |
| // Unload the batch and convert to a row set. |
| loader.load(inputBatch.getHeader().getDef(), inputBatch.getData()); |
| inputBatch.release(); |
| VectorContainer batch = loader.getContainer(); |
| batch.setRecordCount(loader.getRecordCount()); |
| |
| // Null results? Drill will return a single batch with no rows |
| // and no columns even if the scan (or other) operator returns |
| // no batches at all. For ease of testing, simply map this null |
| // result set to a null output row set that says "nothing at all |
| // was returned." Note that this is different than an empty result |
| // set which has a schema, but no rows. |
| if (batch.getRecordCount() == 0 && batch.getNumberOfColumns() == 0) { |
| release(); |
| return false; |
| } |
| |
| if (state == State.START || batch.isSchemaChanged()) { |
| schemaVersion++; |
| } |
| state = State.RUN; |
| return true; |
| } |
| |
| @Override |
| public int schemaVersion() { return schemaVersion; } |
| |
| @Override |
| public VectorContainer batch() { return loader.getContainer(); } |
| |
| @Override |
| public SelectionVector2 sv2() { return null; } |
| |
| @Override |
| public void release() { |
| loader.clear(); |
| } |
| |
| public void retainData() { |
| retainData = true; |
| } |
| |
| @Override |
| public void close() { |
| if (!retainData) { |
| release(); |
| } |
| |
| // Consume any pending input |
| while (state != State.EOF) { |
| QueryEvent event = listener.get(); |
| if (event.type == QueryEvent.Type.EOF) { |
| state = State.EOF; |
| } |
| } |
| } |
| } |