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From davies <...@git.apache.org>
Subject [GitHub] spark pull request: [SPARK-15122][SQL] Fix TPC-DS 41 - Normalize p...
Date Sat, 07 May 2016 02:28:02 GMT
Github user davies commented on a diff in the pull request:

    https://github.com/apache/spark/pull/12954#discussion_r62409983
  
    --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/BooleanSimplification.scala
---
    @@ -0,0 +1,124 @@
    +/*
    + * 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.catalyst.expressions.{And, GreaterThan, GreaterThanOrEqual,
LessThan, LessThanOrEqual, Not, Or, PredicateHelper}
    +import org.apache.spark.sql.catalyst.expressions.Literal._
    +import org.apache.spark.sql.catalyst.plans.logical.LogicalPlan
    +import org.apache.spark.sql.catalyst.rules.Rule
    +
    +/**
    + * Simplifies boolean expressions:
    + * 1. Simplifies expressions whose answer can be determined without evaluating both sides.
    + * 2. Eliminates / extracts common factors.
    + * 3. Merge same expressions
    + * 4. Removes `Not` operator.
    + */
    +object BooleanSimplification extends Rule[LogicalPlan] with PredicateHelper {
    --- End diff --
    
    import it into analyzer as temporary fix, we could think of a proper way later.


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