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From gatorsmile <...@git.apache.org>
Subject [GitHub] spark pull request #16233: [SPARK-18801][SQL] Support resolve a nested view
Date Tue, 10 Jan 2017 06:59:32 GMT
Github user gatorsmile commented on a diff in the pull request:

    https://github.com/apache/spark/pull/16233#discussion_r95308910
  
    --- 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.
    --- End diff --
    
    `stable` -> `completely resolved`


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