Github user twalthr commented on a diff in the pull request:
https://github.com/apache/flink/pull/6090#discussion_r194461789
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/descriptors/PrimitiveTypeDescriptor.scala
---
@@ -0,0 +1,56 @@
+/*
+ * 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.descriptors
+
+import org.apache.flink.api.common.typeinfo.BasicTypeInfo
+import org.apache.flink.table.typeutils.TypeStringUtils
+
+/**
+ * Descriptor for a primitive type.
+ */
+class PrimitiveTypeDescriptor[T] extends HierarchyDescriptor {
+
+ // TODO not sure if we should the BasicTypeInfo here
+ var typeInformation: BasicTypeInfo[T] = _
+ var value: T = _
+
+ def setType(basicType: BasicTypeInfo[T]): PrimitiveTypeDescriptor[T] = {
--- End diff --
This should be regular type information. The `TypeStringUtils` can
stringify every valid type information.
---
