Github user jiangxb1987 commented on a diff in the pull request:
https://github.com/apache/spark/pull/16233#discussion_r95428074
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/view.scala
---
@@ -0,0 +1,90 @@
+/*
+ * 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.analysis
+
+import org.apache.spark.sql.AnalysisException
+import org.apache.spark.sql.catalyst.CatalystConf
+import org.apache.spark.sql.catalyst.expressions.{Alias, Attribute, Cast}
+import org.apache.spark.sql.catalyst.plans.logical.{LogicalPlan, Project,
View}
+import org.apache.spark.sql.catalyst.rules.Rule
+
+/**
+ * This file defines analysis rules related to views.
+ */
+
+/**
+ * Make sure that a view's child plan produces the view's output
attributes. We wrap the child
+ * with a Project and add an alias for each output attribute. The
attributes are resolved by
+ * name. This should be only done after the resolution batch, because the
view attributes are
+ * not stable during resolution.
+ */
+case class AliasViewChild(conf: CatalystConf) extends Rule[LogicalPlan] {
+ override def apply(plan: LogicalPlan): LogicalPlan = plan
resolveOperators {
+ case v @ View(_, output, child) if child.resolved =>
--- End diff --
We match columns by name because the order of the child's output may be not
the same with that of view output.
Will update the code to handle the case when the output have extra columns.
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