Github user haohui commented on a diff in the pull request:
https://github.com/apache/flink/pull/4670#discussion_r140697494
--- Diff:
flink-connectors/flink-orc/src/main/java/org/apache/flink/orc/OrcTableSource.java
---
@@ -0,0 +1,128 @@
+/*
+ * 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.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) {
--- End diff --
Create a new `Configuration` instance is very expensive. It makes sense to
force the users to pass it in.
---
