[GitHub] [spark] jzhuge commented on a change in pull request #25354: [SPARK-28612][SQL] Add DataFrameWriterV2 API

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jzhuge commented on a change in pull request #25354: [SPARK-28612][SQL] Add DataFrameWriterV2 API
URL: https://github.com/apache/spark/pull/25354#discussion_r310694462
 
 

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 File path: sql/catalyst/src/main/java/org/apache/spark/sql/catalyst/expressions/PartitionTransforms.scala
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 @@ -0,0 +1,77 @@
+/*
+ * 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.catalyst.expressions
+
+import org.apache.spark.sql.types.{DataType, IntegerType}
+
+/**
+ * Base class for expressions that are converted to v2 partition transforms.
+ *
+ * Subclasses represent abstract transform functions with concrete implementations that are
+ * determined by data source implementations. Because the concrete implementation is not known,
+ * these expressions are [[Unevaluable]].
+ *
+ * These expressions are used to pass transformations from the DataFrame API:
+ *
+ * {{{
+ *   df.writeTo("catalog.db.table").partitionBy($"category", days($"timestamp")).create()
 
 Review comment:
   Should this be `partitionedBy`?

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