siddharthteotia commented on a change in pull request #8340:
URL: https://github.com/apache/pinot/pull/8340#discussion_r828575168



##########
File path: 
pinot-query-planner/src/main/java/org/apache/pinot/query/type/TypeFactory.java
##########
@@ -0,0 +1,74 @@
+/**
+ * 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.pinot.query.type;
+
+import java.util.Map;
+import org.apache.calcite.jdbc.JavaTypeFactoryImpl;
+import org.apache.calcite.rel.type.RelDataType;
+import org.apache.calcite.rel.type.RelDataTypeSystem;
+import org.apache.calcite.sql.type.SqlTypeName;
+import org.apache.pinot.spi.data.FieldSpec;
+import org.apache.pinot.spi.data.Schema;
+
+
+/**
+ * Extends Java-base TypeFactory from Calcite.
+ */
+public class TypeFactory extends JavaTypeFactoryImpl {

Review comment:
       Not sure why we need to extend from `JavaTypeFactoryImpl` instead of 
`RelDataTypeFactory`
   
   - The interface is [experimental and subject to 
change](https://calcite.apache.org/javadocAggregate/org/apache/calcite/jdbc/JavaTypeFactoryImpl.html)
 in future as per Calcite.
   - JavaTypeFactory is not experimental but the purpose of that interface 
seems to be to map a type / recordType to a java class ? Why do we need that 
model ?




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