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https://issues.apache.org/jira/browse/FLINK-7243?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16651998#comment-16651998
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ASF GitHub Bot commented on FLINK-7243:
---------------------------------------
HuangZhenQiu commented on a change in pull request #6483:
[FLINK-7243][flink-formats] Add parquet input format
URL: https://github.com/apache/flink/pull/6483#discussion_r225604086
##########
File path:
flink-formats/flink-parquet/src/main/java/org/apache/flink/formats/parquet/utils/ParquetSchemaConverter.java
##########
@@ -0,0 +1,242 @@
+/*
+ * 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.parquet.utils;
+
+import org.apache.flink.api.common.typeinfo.BasicArrayTypeInfo;
+import org.apache.flink.api.common.typeinfo.BasicTypeInfo;
+import org.apache.flink.api.common.typeinfo.TypeInformation;
+import org.apache.flink.api.java.typeutils.MapTypeInfo;
+import org.apache.flink.api.java.typeutils.ObjectArrayTypeInfo;
+import org.apache.flink.api.java.typeutils.RowTypeInfo;
+
+import org.apache.parquet.avro.AvroSchemaConverter;
+import org.apache.parquet.schema.GroupType;
+import org.apache.parquet.schema.MessageType;
+import org.apache.parquet.schema.OriginalType;
+import org.apache.parquet.schema.PrimitiveType;
+import org.apache.parquet.schema.Type;
+import org.apache.parquet.schema.Types;
+
+import java.lang.reflect.Array;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Schema converter converts Parquet schema to and from Flink internal types.
+ */
+public class ParquetSchemaConverter {
+ public static final String MAP_KEY = "key";
+ public static final String MAP_VALUE = "value";
+ public static final String LIST_ELEMENT = "array";
+ public static final String MESSAGE_ROOT = "root";
+ private static final AvroSchemaConverter SCHEMA_CONVERTER = new
AvroSchemaConverter();
+
+ public static TypeInformation<?> fromParquetType(MessageType type) {
+ return convertFields(type.getFields());
+ }
+
+ public static MessageType toParquetType(TypeInformation<?>
typeInformation) {
+ return (MessageType) convertField(null, typeInformation,
Type.Repetition.OPTIONAL);
+ }
+
+ private static TypeInformation<?> convertFields(List<Type>
parquetFields) {
+ List<TypeInformation<?>> types = new ArrayList<>();
+ List<String> names = new ArrayList<>();
+ for (Type field : parquetFields) {
+ TypeInformation<?> subType = convertField(field);
+ if (subType != null) {
+ types.add(subType);
+ names.add(field.getName());
+ }
+ }
+
+ return new RowTypeInfo(types.toArray(new
TypeInformation<?>[types.size()]),
+ names.toArray(new String[names.size()]));
+ }
+
+ private static TypeInformation<?> convertField(final Type fieldType) {
+ TypeInformation<?> typeInfo = null;
+ if (fieldType.isPrimitive()) {
+ PrimitiveType primitiveType =
fieldType.asPrimitiveType();
Review comment:
@twalthr Agree. It is needed. Added explicit type conversion for all
Parquet types to Flink types.
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> Add ParquetInputFormat
> ----------------------
>
> Key: FLINK-7243
> URL: https://issues.apache.org/jira/browse/FLINK-7243
> Project: Flink
> Issue Type: Sub-task
> Components: Table API & SQL
> Reporter: godfrey he
> Assignee: Zhenqiu Huang
> Priority: Major
> Labels: pull-request-available
>
> Add a {{ParquetInputFormat}} to read data from a Apache Parquet file.
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