[GitHub] [hudi] wzx140 commented on a diff in pull request #7512: [HUDI-5417] support to read avro from non-legacy map/list in parquet log

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

wzx140 commented on code in PR #7512:
URL: https://github.com/apache/hudi/pull/7512#discussion_r1081013630


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hudi-common/src/main/java/org/apache/parquet/avro/HoodieAvroReadSupport.java:
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@@ -0,0 +1,102 @@
+/*
+ * 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.avro;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.parquet.schema.GroupType;
+import org.apache.parquet.schema.MessageType;
+import org.apache.parquet.schema.OriginalType;
+import org.apache.parquet.schema.Type;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+public class HoodieAvroReadSupport<T> extends AvroReadSupport<T> {
+
+  public HoodieAvroReadSupport() {
+  }
+
+  @Override
+  public ReadContext init(Configuration configuration, Map<String, String> keyValueMetaData, MessageType fileSchema) {
+    boolean legacyMode = checkLegacyMode(fileSchema.getFields());
+    if (!legacyMode) {
+      configuration.set(AvroWriteSupport.WRITE_OLD_LIST_STRUCTURE, "false");
+    }
+    ReadContext readContext = super.init(configuration, keyValueMetaData, fileSchema);
+    MessageType requestedSchema = readContext.getRequestedSchema();
+    if (!legacyMode) {
+      requestedSchema = new MessageType(requestedSchema.getName(), convertLegacyMap(requestedSchema.getFields()));
+    }
+    return new ReadContext(requestedSchema, readContext.getReadSupportMetadata());
+  }
+
+  /**
+   * Check whether write map/list with legacy mode.
+   * list:
+   * optional group obj_ids (LIST) {
+   *   repeated binary array (UTF8);
+   * }
+   * map:
+   * optional group obj_ids (MAP) {
+   *   repeated group map (MAP_KEY_VALUE) {
+   *      required binary key (UTF8);
+   *      required binary value (UTF8);
+   *   }
+   * }
+   */
+  private boolean checkLegacyMode(List<Type> parquetFields) {
+    for (Type type : parquetFields) {
+      if (!type.isPrimitive()) {
+        GroupType groupType = type.asGroupType();
+        OriginalType originalType = groupType.getOriginalType();
+        if (originalType == OriginalType.MAP
+            && groupType.getFields().get(0).getOriginalType() != OriginalType.MAP_KEY_VALUE) {
+          return false;
+        }
+        if (originalType == OriginalType.LIST
+            && !groupType.getType(0).getName().equals("array")) {
+          return false;
+        }
+        if (!checkLegacyMode(groupType.getFields())) {
+          return false;
+        }
+      }
+    }
+    return true;
+  }
+
+  private List<Type> convertLegacyMap(List<Type> oldTypes) {
+    List<Type> newTypes = new ArrayList<>(oldTypes.size());
+    for (Type type : oldTypes) {
+      if (!type.isPrimitive()) {
+        GroupType parent = type.asGroupType();
+        List<Type> types = convertLegacyMap(parent.getFields());
+        if (type.getOriginalType() == OriginalType.MAP_KEY_VALUE) {

Review Comment:
   To convert non-legacy map schema to legacy map schema. Because there is no AvroWriteSupport.WRITE_OLD_MAP_STRUCTURE according to AvroWriteSupport.WRITE_OLD_LIST_STRUCTURE



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