[GitHub] [flink] JingsongLi commented on a change in pull request #12010: [FLINK-17286][connectors / filesystem]Integrate json to file system connector

[GitBox <gi...@apache.org>]

JingsongLi commented on a change in pull request #12010:
URL: https://github.com/apache/flink/pull/12010#discussion_r421200211



##########
File path: flink-formats/flink-json/src/main/java/org/apache/flink/formats/json/JsonRowDataFileInputFormat.java
##########
@@ -0,0 +1,248 @@
+/*
+ * 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.formats.json;
+
+import org.apache.flink.api.common.typeinfo.TypeInformation;
+import org.apache.flink.core.fs.FileInputSplit;
+import org.apache.flink.core.fs.Path;
+import org.apache.flink.table.api.TableSchema;
+import org.apache.flink.table.data.GenericRowData;
+import org.apache.flink.table.data.RowData;
+import org.apache.flink.table.factories.FileSystemFormatFactory;
+import org.apache.flink.table.types.DataType;
+import org.apache.flink.table.types.logical.LogicalType;
+import org.apache.flink.table.types.logical.RowType;
+import org.apache.flink.table.utils.PartitionPathUtils;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.nio.charset.Charset;
+import java.util.Arrays;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.stream.Collectors;
+
+import static org.apache.flink.util.Preconditions.checkNotNull;
+
+/**
+ * A {@link JsonRowDataFileInputFormat} is responsible to read {@link RowData} records
+ * from json format files.
+ */
+public class JsonRowDataFileInputFormat extends AbstractJsonFileInputFormat<RowData> {
+
+	private static final long serialVersionUID = 1L;
+
+	private final List<DataType> fieldTypes;
+	private final List<String> fieldNames;
+	private final int[] selectFields;
+	private final List<String> partitionKeys;
+	private final String defaultPartValue;
+	private final long limit;
+	private final List<String> jsonSelectFieldNames;
+	private final int[] jsonFieldMapping;
+	private final JsonRowDataDeserializationSchema deserializationSchema;
+
+	private transient boolean end;
+	private transient long emitted;
+	// reuse object for per record
+	private transient GenericRowData rowData;
+	private transient InputStreamReader inputStreamReader;
+	private transient BufferedReader reader;
+	private transient Charset charset;
+
+	private JsonRowDataFileInputFormat(
+		Path[] filePaths,
+		RowType nonPartitionRowType,
+		TypeInformation nonPartitionRowTypeInfo,
+		List<DataType> dataTypes,
+		List<String> fieldNames,
+		int[] selectFields,
+		List<String> partitionKeys,
+		String defaultPartValue,
+		boolean failOnMissingField,
+		boolean ignoreParseErrors,
+		long limit) {
+		super(filePaths);
+		this.fieldTypes = dataTypes;
+		this.fieldNames = fieldNames;
+		this.selectFields = selectFields;
+		this.partitionKeys = partitionKeys;
+		this.defaultPartValue = defaultPartValue;
+		this.limit = limit;
+		// project field
+		List<String> selectFieldNames = Arrays.stream(selectFields)
+			.mapToObj(fieldNames::get)
+			.collect(Collectors.toList());
+		this.jsonSelectFieldNames = selectFieldNames.stream()
+			.filter(name -> !partitionKeys.contains(name)).collect(Collectors.toList());
+		this.jsonFieldMapping = jsonSelectFieldNames.stream().mapToInt(selectFieldNames::indexOf).toArray();
+		this.deserializationSchema = new JsonRowDataDeserializationSchema(
+			nonPartitionRowType,
+			nonPartitionRowTypeInfo,
+			failOnMissingField,
+			ignoreParseErrors);
+	}
+
+	@Override
+	public void open(FileInputSplit split) throws IOException {
+		super.open(split);
+		this.end = false;
+		this.inputStreamReader = new InputStreamReader(jsonInputStream);
+		this.reader = new BufferedReader(inputStreamReader);
+		this.charset = Charset.forName("UTF-8");
+		fillPartitionValueForRecord();
+		this.emitted = 0L;
+	}
+
+	private void fillPartitionValueForRecord() {
+		rowData = new GenericRowData(selectFields.length);
+		Path path = currentSplit.getPath();
+		LinkedHashMap<String, String> partSpec = PartitionPathUtils.extractPartitionSpecFromPath(path);
+		for (int i = 0; i < selectFields.length; i++) {
+			int selectField = selectFields[i];
+			String name = fieldNames.get(selectField);
+			if (partitionKeys.contains(name)) {
+				String value = partSpec.get(name);
+				value = defaultPartValue.equals(value) ? null : value;
+				rowData.setField(i, PartitionPathUtils.restorePartValueFromType(value, fieldTypes.get(selectField)));
+			}
+		}
+	}
+
+	@Override
+	public boolean reachedEnd() throws IOException {
+		return emitted >= limit || end;
+	}
+
+	@Override
+	public RowData nextRecord(RowData reuse) throws IOException {
+		GenericRowData returnRecord = rowData;
+		String line = reader.readLine();
+		if (line == null) {
+			this.end = true;
+			return null;
+		}
+		GenericRowData jsonRow = (GenericRowData) deserializationSchema.deserialize(line.getBytes(charset));
+		if (jsonRow != null) {
+			for (int i = 0; i < jsonSelectFieldNames.size(); i++) {
+				returnRecord.setField(jsonFieldMapping[i], jsonRow.getField(i));
+			}
+		}
+		emitted++;
+		return returnRecord;
+	}
+
+	@Override
+	public void close() throws IOException {
+		super.close();
+		if (reader != null) {
+			this.reader.close();
+			this.reader = null;
+		}
+		if (inputStreamReader != null) {
+			this.inputStreamReader.close();
+			this.inputStreamReader = null;
+		}
+	}
+
+	public static Builder builder(FileSystemFormatFactory.ReaderContext context, TableSchema tableSchema, List<String> partitionKeys, Path... filePaths) {
+		return new Builder(context, tableSchema, partitionKeys, filePaths);
+	}
+
+	/**
+	 * Builder for {@link JsonRowDataFileInputFormat}.
+	 */
+	public static class Builder {

Review comment:
       This class is not for user, we don't need builder.




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