[GitHub] [flink] dawidwys commented on a change in pull request #12900: [FLINK-18537][table] Remove RowDataTypeInfo

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dawidwys commented on a change in pull request #12900:
URL: https://github.com/apache/flink/pull/12900#discussion_r454415036



##########
File path: flink-table/flink-table-common/src/main/java/org/apache/flink/table/types/DataTypeQueryable.java
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@@ -0,0 +1,30 @@
+/*
+ * 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.table.types;
+
+import org.apache.flink.annotation.PublicEvolving;
+
+/**
+ * Indicates that a {@link DataType} can be retrieved from a class that implements this interfaces.
+ */
+@PublicEvolving
+public interface DataTypeQueryable {

Review comment:
       Is this interface really necessary? Especially with `@PublicEvolving` annotation? How are users supposed to use it? If I understand it correctly you need it for internal operations. Moreover you need it because the `WrapperTypeInfo` is in `blink-runtime`, right?
   
   Can't we move the `WrapperTypeInfo` to the `table-common` instead?  The class itself has no runtime dependencies. Only the factory methods need some runtime classes.




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