| /* |
| * 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.parquet.cascading; |
| |
| import java.io.IOException; |
| import java.io.Serializable; |
| import java.util.Objects; |
| |
| import org.apache.hadoop.mapred.JobConf; |
| import org.apache.hadoop.mapred.OutputCollector; |
| import org.apache.hadoop.mapred.RecordReader; |
| |
| import cascading.flow.FlowProcess; |
| import cascading.scheme.Scheme; |
| import cascading.scheme.SinkCall; |
| import cascading.scheme.SourceCall; |
| import cascading.tap.Tap; |
| import cascading.tuple.Tuple; |
| import cascading.tuple.TupleEntry; |
| import org.apache.parquet.filter2.predicate.FilterPredicate; |
| import org.apache.parquet.hadoop.ParquetInputFormat; |
| import org.apache.parquet.hadoop.mapred.Container; |
| import org.apache.parquet.hadoop.thrift.ParquetThriftInputFormat; |
| import org.apache.parquet.hadoop.thrift.ThriftReadSupport; |
| |
| /** |
| * A Cascading Scheme that returns a simple Tuple with a single value, the "value" object |
| * coming out of the underlying InputFormat. |
| * |
| * This is an abstract class; implementations are expected to set up their Input/Output Formats |
| * correctly in the respective Init methods. |
| */ |
| public abstract class ParquetValueScheme<T> extends Scheme<JobConf, RecordReader, OutputCollector, Object[], Object[]>{ |
| |
| public static final class Config<T> implements Serializable { |
| private final FilterPredicate filterPredicate; |
| private final String deprecatedProjectionString; |
| private final String strictProjectionString; |
| private final Class<T> klass; |
| |
| private Config(Class<T> klass, FilterPredicate filterPredicate, String deprecatedProjectionString, String strictProjectionString) { |
| this.filterPredicate = filterPredicate; |
| this.deprecatedProjectionString = deprecatedProjectionString; |
| this.strictProjectionString = strictProjectionString; |
| this.klass = klass; |
| } |
| |
| public Config() { |
| filterPredicate = null; |
| deprecatedProjectionString = null; |
| strictProjectionString = null; |
| klass = null; |
| } |
| |
| public FilterPredicate getFilterPredicate() { |
| return filterPredicate; |
| } |
| |
| @Deprecated |
| public String getProjectionString() { |
| return deprecatedProjectionString; |
| } |
| |
| public String getStrictProjectionString() { |
| return strictProjectionString; |
| } |
| |
| public Class<T> getKlass() { |
| return klass; |
| } |
| |
| public Config<T> withFilterPredicate(FilterPredicate f) { |
| return new Config<T>(this.klass, |
| Objects.requireNonNull(f, "filterPredicate cannot be null"), |
| this.deprecatedProjectionString, this.strictProjectionString); |
| } |
| |
| @Deprecated |
| public Config<T> withProjectionString(String p) { |
| return new Config<T>(this.klass, this.filterPredicate, |
| Objects.requireNonNull(p, "projectionString cannot be null"), |
| this.strictProjectionString); |
| } |
| |
| public Config<T> withStrictProjectionString(String p) { |
| return new Config<T>(this.klass, this.filterPredicate, |
| this.deprecatedProjectionString, |
| Objects.requireNonNull(p, "projectionString cannot be null")); |
| } |
| |
| public Config<T> withRecordClass(Class<T> klass) { |
| return new Config<T>( |
| Objects.requireNonNull(klass, "recordClass cannot be null"), |
| this.filterPredicate, this.deprecatedProjectionString, |
| this.strictProjectionString); |
| } |
| } |
| |
| private static final long serialVersionUID = 157560846420730043L; |
| protected final Config<T> config; |
| |
| public ParquetValueScheme() { |
| this(new Config<T>()); |
| } |
| |
| public ParquetValueScheme(FilterPredicate filterPredicate) { |
| this(new Config<T>().withFilterPredicate(filterPredicate)); |
| } |
| |
| public ParquetValueScheme(Config<T> config) { |
| this.config = config; |
| } |
| |
| @Deprecated |
| private void setProjectionPushdown(JobConf jobConf) { |
| if (this.config.deprecatedProjectionString != null) { |
| ThriftReadSupport.setProjectionPushdown(jobConf, this.config.deprecatedProjectionString); |
| } |
| } |
| |
| private void setStrictProjectionPushdown(JobConf jobConf) { |
| if (this.config.strictProjectionString != null) { |
| ThriftReadSupport.setStrictFieldProjectionFilter(jobConf, this.config.strictProjectionString); |
| } |
| } |
| |
| private void setPredicatePushdown(JobConf jobConf) { |
| if (this.config.filterPredicate != null) { |
| ParquetInputFormat.setFilterPredicate(jobConf, this.config.filterPredicate); |
| } |
| } |
| @Override |
| public void sourceConfInit(FlowProcess<? extends JobConf> jobConfFlowProcess, Tap<JobConf, RecordReader, OutputCollector> jobConfRecordReaderOutputCollectorTap, JobConf jobConf) { |
| setPredicatePushdown(jobConf); |
| setProjectionPushdown(jobConf); |
| setStrictProjectionPushdown(jobConf); |
| setRecordClass(jobConf); |
| } |
| |
| private void setRecordClass(JobConf jobConf) { |
| if (config.klass != null) { |
| ParquetThriftInputFormat.setThriftClass(jobConf, config.klass); |
| } |
| } |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public boolean source(FlowProcess<? extends JobConf> fp, SourceCall<Object[], RecordReader> sc) |
| throws IOException { |
| Container<T> value = (Container<T>) sc.getInput().createValue(); |
| boolean hasNext = sc.getInput().next(null, value); |
| if (!hasNext) { return false; } |
| |
| // Skip nulls |
| if (value == null) { return true; } |
| |
| sc.getIncomingEntry().setTuple(new Tuple(value.get())); |
| return true; |
| } |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public void sink(FlowProcess<? extends JobConf> fp, SinkCall<Object[], OutputCollector> sc) |
| throws IOException { |
| TupleEntry tuple = sc.getOutgoingEntry(); |
| |
| if (tuple.size() != 1) { |
| throw new RuntimeException("ParquetValueScheme expects tuples with an arity of exactly 1, but found " + tuple.getFields()); |
| } |
| |
| T value = (T) tuple.getObject(0); |
| OutputCollector output = sc.getOutput(); |
| output.collect(null, value); |
| } |
| |
| } |