[HUDI-2147] Remove unused class AvroConvertor in hudi-flink (#3243)

hudi-flink/src/main/java/org/apache/hudi/util/AvroConvertor.java

@@ -1,81 +0,0 @@
-/*
- * 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.hudi.util;
-
-import org.apache.hudi.avro.MercifulJsonConverter;
-
-import com.twitter.bijection.Injection;
-import org.apache.avro.Schema;
-import org.apache.avro.generic.GenericRecord;
-
-import java.io.Serializable;
-
-/**
- * Convert a variety of datum into Avro GenericRecords. Has a bunch of lazy fields to circumvent issues around
- * serializing these objects from driver to executors
- */
-public class AvroConvertor implements Serializable {
-
-  private static final long serialVersionUID = 1L;
-  /**
-   * To be lazily inited on executors.
-   */
-  private transient Schema schema;
-
-  private final String schemaStr;
-
-  /**
-   * To be lazily inited on executors.
-   */
-  private transient MercifulJsonConverter jsonConverter;
-
-
-  /**
-   * To be lazily inited on executors.
-   */
-  private transient Injection<GenericRecord, byte[]> recordInjection;
-
-  public AvroConvertor(String schemaStr) {
-    this.schemaStr = schemaStr;
-  }
-
-  public AvroConvertor(Schema schema) {
-    this.schemaStr = schema.toString();
-    this.schema = schema;
-  }
-
-  private void initSchema() {
-    if (schema == null) {
-      Schema.Parser parser = new Schema.Parser();
-      schema = parser.parse(schemaStr);
-    }
-  }
-
-  private void initJsonConvertor() {
-    if (jsonConverter == null) {
-      jsonConverter = new MercifulJsonConverter();
-    }
-  }
-
-  public GenericRecord fromJson(String json) {
-    initSchema();
-    initJsonConvertor();
-    return jsonConverter.convert(json, schema);
-  }
-}