[GitHub] [spark] rdblue commented on a change in pull request #24117: [SPARK-27181][SQL]: Add public transform API

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rdblue commented on a change in pull request #24117: [SPARK-27181][SQL]: Add public transform API
URL: https://github.com/apache/spark/pull/24117#discussion_r271374615
 
 

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 File path: sql/catalyst/src/main/java/org/apache/spark/sql/catalog/v2/expressions/Transform.java
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 @@ -0,0 +1,44 @@
+/*
+ * 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.catalog.v2.expressions;
+
+import org.apache.spark.annotation.Experimental;
+
+/**
+ * Represents a transform function in the public logical expression API.
+ * <p>
+ * For example, the transform date(ts) is used to derive a date value from a timestamp column. The
+ * transform name is "date" and its argument is a reference to the "ts" column.
+ */
+@Experimental
+public interface Transform extends Expression {
+  /**
+   * Returns the transform function name.
+   */
+  String name();
+
+  /**
+   * Returns all field references in the transform arguments.
+   */
+  NamedReference[] references();
 
 Review comment:
   This is for validation. Spark should validate that there aren't any unresolved references.

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