Github user maropu commented on a diff in the pull request: https://github.com/apache/spark/pull/20929#discussion_r178415303 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/types/TypePlaceholder.scala --- @@ -0,0 +1,23 @@ +/* + * 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.spark.sql.types + +/** + * An internal type that is a not yet available and will be replaced by an actual type later. + */ +case object TypePlaceholder extends StringType --- End diff -- I just added this weird type for this prototype, so we need to consider more here. I don't have better idea now, so I'd like to have any suggestion about this.
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