Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/5240#discussion_r163071426
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/typeutils/TypeStringUtils.scala
---
@@ -0,0 +1,213 @@
+/*
+ * 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.typeutils
+
+import java.io.Serializable
+
+import org.apache.commons.codec.binary.Base64
+import org.apache.commons.lang3.StringEscapeUtils
+import org.apache.flink.api.common.typeinfo.{BasicArrayTypeInfo,
PrimitiveArrayTypeInfo, TypeInformation}
+import org.apache.flink.api.common.typeutils.CompositeType
+import org.apache.flink.api.java.typeutils._
+import org.apache.flink.table.api.{TableException, Types,
ValidationException}
+import
org.apache.flink.table.descriptors.NormalizedProperties.normalizeTypeInfo
+import org.apache.flink.util.InstantiationUtil
+
+import _root_.scala.language.implicitConversions
+import _root_.scala.util.parsing.combinator.{JavaTokenParsers,
PackratParsers}
+
+/**
+ * Utilities to convert
[[org.apache.flink.api.common.typeinfo.TypeInformation]] into a
+ * string representation and back.
+ */
+object TypeStringUtils extends JavaTokenParsers with PackratParsers {
--- End diff --
We need unit tests for the parser.
---
