Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/5240#discussion_r164122214
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/descriptors/NormalizedProperties.scala
---
@@ -0,0 +1,328 @@
+/*
+ * 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 java.io.Serializable
+import java.lang.{Boolean => JBoolean, Double => JDouble, Integer => JInt,
Long => JLong}
+
+import org.apache.commons.codec.binary.Base64
+import org.apache.flink.api.common.typeinfo.TypeInformation
+import org.apache.flink.table.api.{TableSchema, ValidationException}
+import org.apache.flink.table.descriptors.DescriptorUtils._
+import
org.apache.flink.table.descriptors.NormalizedProperties.normalizeTableSchema
+import org.apache.flink.table.plan.stats.ColumnStats
+import org.apache.flink.table.sources.tsextractors.{ExistingField,
StreamRecordTimestamp, TimestampExtractor}
+import org.apache.flink.table.sources.wmstrategies.{AscendingTimestamps,
BoundedOutOfOrderTimestamps, PreserveWatermarks, WatermarkStrategy}
+import org.apache.flink.table.typeutils.TypeStringUtils
+import org.apache.flink.util.InstantiationUtil
+import org.apache.flink.util.Preconditions.checkNotNull
+
+import scala.collection.mutable
+
+/**
+ * Utility class for having a unified string-based representation of
Table API related classes
+ * such as [[TableSchema]], [[TypeInformation]], [[WatermarkStrategy]],
etc.
+ */
+class NormalizedProperties(
--- End diff --
Rename to `TableSourceProperties`? `NormalizedProperties` is quite generic
---
