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[FLINK-2170] [connectors] Add OrcRowInputFormat and OrcTableSource.
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This closes apache#4670.
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@uybhatti @fhueske
uybhatti authored and fhueske committed Nov 22, 2017
1 parent 5017c67 commit edbf8c9
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152 changes: 152 additions & 0 deletions flink-connectors/flink-orc/pom.xml
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<?xml version="1.0" encoding="UTF-8"?>
<!--
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
https://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.
-->
<project xmlns="https://maven.apache.org/POM/4.0.0" xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="https://maven.apache.org/POM/4.0.0 https://maven.apache.org/maven-v4_0_0.xsd">

<modelVersion>4.0.0</modelVersion>

<parent>
<groupId>org.apache.flink</groupId>
<artifactId>flink-connectors</artifactId>
<version>1.4-SNAPSHOT</version>
<relativePath>..</relativePath>
</parent>

<artifactId>flink-orc_${scala.binary.version}</artifactId>
<name>flink-orc</name>

<packaging>jar</packaging>

<dependencies>

<!-- core dependencies -->

<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-table_${scala.binary.version}</artifactId>
<version>${project.version}</version>
<scope>compile</scope>
</dependency>

<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-streaming-scala_${scala.binary.version}</artifactId>
<version>${project.version}</version>
<scope>compile</scope>
</dependency>

<dependency>
<groupId>org.apache.orc</groupId>
<artifactId>orc-core</artifactId>
<version>1.4.0</version>
</dependency>

<!-- test dependencies -->

<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-test-utils-junit</artifactId>
<version>${project.version}</version>
<scope>test</scope>
</dependency>

<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-test-utils_${scala.binary.version}</artifactId>
<version>${project.version}</version>
<scope>test</scope>
</dependency>

<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-clients_${scala.binary.version}</artifactId>
<version>${project.version}</version>
<scope>test</scope>
</dependency>

<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-core</artifactId>
<version>${project.version}</version>
<scope>test</scope>
<type>test-jar</type>
</dependency>
</dependencies>

<build>

<pluginManagement>
<plugins>
<!--This plugin's configuration is used to store Eclipse m2e settings only. It has no influence on the Maven build itself.-->
<plugin>
<groupId>org.eclipse.m2e</groupId>
<artifactId>lifecycle-mapping</artifactId>
<version>1.0.0</version>
<configuration>
<lifecycleMappingMetadata>
<pluginExecutions>
<pluginExecution>
<pluginExecutionFilter>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<versionRange>[2.4,)</versionRange>
<goals>
<goal>single</goal>
</goals>
</pluginExecutionFilter>
<action>
<ignore/>
</action>
</pluginExecution>
<pluginExecution>
<pluginExecutionFilter>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-clean-plugin</artifactId>
<versionRange>[1,)</versionRange>
<goals>
<goal>clean</goal>
</goals>
</pluginExecutionFilter>
<action>
<ignore/>
</action>
</pluginExecution>
<pluginExecution>
<pluginExecutionFilter>
<groupId>org.apache.avro</groupId>
<artifactId>avro-maven-plugin</artifactId>
<versionRange>[1.7.7,)</versionRange>
<goals>
<goal>schema</goal>
</goals>
</pluginExecutionFilter>
<action>
<ignore/>
</action>
</pluginExecution>
</pluginExecutions>
</lifecycleMappingMetadata>
</configuration>
</plugin>
</plugins>
</pluginManagement>
</build>

</project>
128 changes: 128 additions & 0 deletions flink-connectors/flink-orc/src/main/java/org/apache/flink/orc/OrcTableSource.java
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/*
* 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
*
* https://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.flink.orc;

import org.apache.flink.api.common.typeinfo.TypeInformation;
import org.apache.flink.api.java.DataSet;
import org.apache.flink.api.java.ExecutionEnvironment;
import org.apache.flink.api.java.typeutils.RowTypeInfo;
import org.apache.flink.table.sources.BatchTableSource;
import org.apache.flink.table.sources.ProjectableTableSource;
import org.apache.flink.table.sources.TableSource;
import org.apache.flink.types.Row;

import org.apache.hadoop.conf.Configuration;
import org.apache.orc.TypeDescription;

/**
* Creates a TableSource to read ORC file.
*
* <p>The ORC file path and schema is passed during {@link OrcTableSource} construction. configuration is optional.
*
* <p>The OrcTableSource is used as shown in the example below.
*
* <pre>
* {@code
* String path = testInputURL.getPath();
* String schema = "struct<col1:boolean,col2:tinyint,col3:smallint,col4:int>"
* OrcTableSource orcSrc = new OrcTableSource(path, schema);
* tEnv.registerTableSource("orcTable", orcSrc);
* Table res = tableEnv.sql("SELECT * FROM orcTable");
* }
* </pre>
*/
public class OrcTableSource implements BatchTableSource<Row>, ProjectableTableSource<Row> {

private String path;
private TypeDescription orcSchema;
private RowTypeInfo typeInfo;
private Configuration orcConfig;
private int[] fieldMapping;

/**
* The ORC file path and schema.
*
* @param path the path of orc file
* @param orcSchema schema of orc file
*/
public OrcTableSource(String path, String orcSchema) {
this(path, orcSchema, new Configuration());
}

/**
* The file path and schema of orc file, and configuration to read orc file .
*
* @param path the path of orc file
* @param orcSchema schema of orc file
* @param orcConfig configuration to read orc file
*/
public OrcTableSource(String path, String orcSchema, Configuration orcConfig) {
this(path, TypeDescription.fromString(orcSchema), orcConfig);
}

public OrcTableSource(String path, TypeDescription orcSchema, Configuration orcConfig) {
this.path = path;
this.orcSchema = orcSchema;
this.orcConfig = orcConfig;

this.typeInfo = (RowTypeInfo) OrcUtils.schemaToTypeInfo(this.orcSchema);

}

@Override
public DataSet<Row> getDataSet(ExecutionEnvironment execEnv) {

RowOrcInputFormat orcIF = new RowOrcInputFormat(path, orcSchema, orcConfig);
if (fieldMapping != null) {
orcIF.setFieldMapping(fieldMapping);
}
return execEnv.createInput(orcIF);
}

@Override
public TypeInformation<Row> getReturnType() {
return typeInfo;
}

@Override
public TableSource<Row> projectFields(int[] fields) {

OrcTableSource copy = new OrcTableSource(path, orcSchema, orcConfig);

// set field mapping
copy.fieldMapping = fields;

// adapt TypeInfo
TypeInformation[] fieldTypes = new TypeInformation[fields.length];
String[] fieldNames = new String[fields.length];
for (int i = 0; i < fields.length; i++) {
fieldTypes[i] = this.typeInfo.getTypeAt(fields[i]);
fieldNames[i] = this.typeInfo.getFieldNames()[fields[i]];
}
copy.typeInfo = new RowTypeInfo(fieldTypes, fieldNames);

return copy;
}

@Override
public String explainSource() {
return "ORC Source file at path " + this.path + " with schema " + this.orcSchema;
}

}
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