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From lionelcao <...@git.apache.org>
Subject [GitHub] incubator-carbondata pull request #625: [CARBONDATA-743] Remove redundant Ca...
Date Tue, 07 Mar 2017 02:24:39 GMT
Github user lionelcao commented on a diff in the pull request:

    https://github.com/apache/incubator-carbondata/pull/625#discussion_r104575573
  
    --- Diff: integration/spark2/src/main/scala/org/apache/carbondata/spark/CarbonFilters.scala
---
    @@ -1,397 +0,0 @@
    -/*
    - * 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.carbondata.spark
    -
    -import scala.collection.mutable.ArrayBuffer
    -
    -import org.apache.spark.sql.catalyst.expressions._
    -import org.apache.spark.sql.optimizer.AttributeReferenceWrapper
    -import org.apache.spark.sql.sources
    -import org.apache.spark.sql.types.StructType
    -
    -import org.apache.carbondata.core.metadata.datatype.DataType
    -import org.apache.carbondata.core.metadata.schema.table.CarbonTable
    -import org.apache.carbondata.core.metadata.schema.table.column.CarbonColumn
    -import org.apache.carbondata.core.scan.expression.{ColumnExpression => CarbonColumnExpression,
Expression => CarbonExpression, LiteralExpression => CarbonLiteralExpression}
    -import org.apache.carbondata.core.scan.expression.conditional._
    -import org.apache.carbondata.core.scan.expression.logical.{AndExpression, FalseExpression,
OrExpression}
    -import org.apache.carbondata.spark.util.CarbonScalaUtil
    -
    -/**
    - * All filter conversions are done here.
    - */
    -object CarbonFilters {
    -
    -  /**
    -   * Converts data sources filters to carbon filter predicates.
    -   */
    -  def createCarbonFilter(schema: StructType,
    -      predicate: sources.Filter): Option[CarbonExpression] = {
    -    val dataTypeOf = schema.map(f => f.name -> f.dataType).toMap
    -
    -    def createFilter(predicate: sources.Filter): Option[CarbonExpression] = {
    -      predicate match {
    -
    -        case sources.EqualTo(name, value) =>
    -          Some(new EqualToExpression(getCarbonExpression(name),
    -            getCarbonLiteralExpression(name, value)))
    -        case sources.Not(sources.EqualTo(name, value)) =>
    -          Some(new NotEqualsExpression(getCarbonExpression(name),
    -            getCarbonLiteralExpression(name, value)))
    -
    -        case sources.EqualNullSafe(name, value) =>
    -          Some(new EqualToExpression(getCarbonExpression(name),
    -            getCarbonLiteralExpression(name, value)))
    -        case sources.Not(sources.EqualNullSafe(name, value)) =>
    -          Some(new NotEqualsExpression(getCarbonExpression(name),
    -            getCarbonLiteralExpression(name, value)))
    -
    -        case sources.GreaterThan(name, value) =>
    -          Some(new GreaterThanExpression(getCarbonExpression(name),
    -            getCarbonLiteralExpression(name, value)))
    -        case sources.LessThan(name, value) =>
    -          Some(new LessThanExpression(getCarbonExpression(name),
    -            getCarbonLiteralExpression(name, value)))
    -        case sources.GreaterThanOrEqual(name, value) =>
    -          Some(new GreaterThanEqualToExpression(getCarbonExpression(name),
    -            getCarbonLiteralExpression(name, value)))
    -        case sources.LessThanOrEqual(name, value) =>
    -          Some(new LessThanEqualToExpression(getCarbonExpression(name),
    -            getCarbonLiteralExpression(name, value)))
    -
    -        case sources.In(name, values) =>
    -          Some(new InExpression(getCarbonExpression(name),
    -            new ListExpression(
    -              convertToJavaList(values.map(f => getCarbonLiteralExpression(name, f)).toList))))
    -        case sources.Not(sources.In(name, values)) =>
    -          Some(new NotInExpression(getCarbonExpression(name),
    -            new ListExpression(
    -              convertToJavaList(values.map(f => getCarbonLiteralExpression(name, f)).toList))))
    -
    -        case sources.IsNull(name) =>
    -          Some(new EqualToExpression(getCarbonExpression(name),
    -            getCarbonLiteralExpression(name, null), true))
    -        case sources.IsNotNull(name) =>
    -          Some(new NotEqualsExpression(getCarbonExpression(name),
    -            getCarbonLiteralExpression(name, null), true))
    -        case sources.And(lhs, rhs) =>
    -          (createFilter(lhs) ++ createFilter(rhs)).reduceOption(new AndExpression(_,
_))
    -
    -        case sources.Or(lhs, rhs) =>
    -          for {
    -            lhsFilter <- createFilter(lhs)
    -            rhsFilter <- createFilter(rhs)
    -          } yield {
    -            new OrExpression(lhsFilter, rhsFilter)
    -          }
    -
    -        case _ => None
    -      }
    -    }
    -
    -    def getCarbonExpression(name: String) = {
    -      new CarbonColumnExpression(name,
    -        CarbonScalaUtil.convertSparkToCarbonDataType(dataTypeOf(name)))
    -    }
    -
    -    def getCarbonLiteralExpression(name: String, value: Any): CarbonExpression = {
    -      new CarbonLiteralExpression(value,
    -        CarbonScalaUtil.convertSparkToCarbonDataType(dataTypeOf(name)))
    -    }
    -
    -    createFilter(predicate)
    -  }
    -
    -
    -  // Check out which filters can be pushed down to carbon, remaining can be handled in
spark layer.
    -  // Mostly dimension filters are only pushed down since it is faster in carbon.
    -  def selectFilters(filters: Seq[Expression],
    -      attrList: java.util.HashSet[AttributeReferenceWrapper],
    -      aliasMap: CarbonAliasDecoderRelation): Unit = {
    -    def translate(expr: Expression, or: Boolean = false): Option[sources.Filter] = {
    -      expr match {
    -        case or@ Or(left, right) =>
    -
    -          val leftFilter = translate(left, or = true)
    -          val rightFilter = translate(right, or = true)
    -          if (leftFilter.isDefined && rightFilter.isDefined) {
    -            Some( sources.Or(leftFilter.get, rightFilter.get))
    -          } else {
    -            or.collect {
    -              case attr: AttributeReference =>
    -                attrList.add(AttributeReferenceWrapper(aliasMap.getOrElse(attr, attr)))
    -            }
    -            None
    -          }
    -
    -        case And(left, right) =>
    -          (translate(left) ++ translate(right)).reduceOption(sources.And)
    -
    -        case EqualTo(a: Attribute, Literal(v, t)) =>
    -          Some(sources.EqualTo(a.name, v))
    -        case EqualTo(l@Literal(v, t), a: Attribute) =>
    -          Some(sources.EqualTo(a.name, v))
    -        case EqualTo(Cast(a: Attribute, _), Literal(v, t)) =>
    -          Some(sources.EqualTo(a.name, v))
    -        case EqualTo(Literal(v, t), Cast(a: Attribute, _)) =>
    -          Some(sources.EqualTo(a.name, v))
    -
    -        case Not(EqualTo(a: Attribute, Literal(v, t))) =>
    -            Some(sources.Not(sources.EqualTo(a.name, v)))
    -        case Not(EqualTo(Literal(v, t), a: Attribute)) =>
    -            Some(sources.Not(sources.EqualTo(a.name, v)))
    -        case Not(EqualTo(Cast(a: Attribute, _), Literal(v, t))) =>
    -            Some(sources.Not(sources.EqualTo(a.name, v)))
    -        case Not(EqualTo(Literal(v, t), Cast(a: Attribute, _))) =>
    -            Some(sources.Not(sources.EqualTo(a.name, v)))
    -        case IsNotNull(a: Attribute) => Some(sources.IsNotNull(a.name))
    -        case IsNull(a: Attribute) => Some(sources.IsNull(a.name))
    -        case Not(In(a: Attribute, list)) if !list.exists(!_.isInstanceOf[Literal]) =>
    -          val hSet = list.map(e => e.eval(EmptyRow))
    -          Some(sources.Not(sources.In(a.name, hSet.toArray)))
    -        case In(a: Attribute, list) if !list.exists(!_.isInstanceOf[Literal]) =>
    -          val hSet = list.map(e => e.eval(EmptyRow))
    -          Some(sources.In(a.name, hSet.toArray))
    -        case Not(In(Cast(a: Attribute, _), list))
    -          if !list.exists(!_.isInstanceOf[Literal]) =>
    -          val hSet = list.map(e => e.eval(EmptyRow))
    -          Some(sources.Not(sources.In(a.name, hSet.toArray)))
    -        case In(Cast(a: Attribute, _), list) if !list.exists(!_.isInstanceOf[Literal])
=>
    -          val hSet = list.map(e => e.eval(EmptyRow))
    -          Some(sources.In(a.name, hSet.toArray))
    -
    -        case GreaterThan(a: Attribute, Literal(v, t)) =>
    -          Some(sources.GreaterThan(a.name, v))
    -        case GreaterThan(Literal(v, t), a: Attribute) =>
    -          Some(sources.LessThan(a.name, v))
    -        case GreaterThan(Cast(a: Attribute, _), Literal(v, t)) =>
    -          Some(sources.GreaterThan(a.name, v))
    -        case GreaterThan(Literal(v, t), Cast(a: Attribute, _)) =>
    -          Some(sources.LessThan(a.name, v))
    -
    -        case LessThan(a: Attribute, Literal(v, t)) =>
    -          Some(sources.LessThan(a.name, v))
    -        case LessThan(Literal(v, t), a: Attribute) =>
    -          Some(sources.GreaterThan(a.name, v))
    -        case LessThan(Cast(a: Attribute, _), Literal(v, t)) =>
    -          Some(sources.LessThan(a.name, v))
    -        case LessThan(Literal(v, t), Cast(a: Attribute, _)) =>
    -          Some(sources.GreaterThan(a.name, v))
    -
    -        case GreaterThanOrEqual(a: Attribute, Literal(v, t)) =>
    -          Some(sources.GreaterThanOrEqual(a.name, v))
    -        case GreaterThanOrEqual(Literal(v, t), a: Attribute) =>
    -          Some(sources.LessThanOrEqual(a.name, v))
    -        case GreaterThanOrEqual(Cast(a: Attribute, _), Literal(v, t)) =>
    -          Some(sources.GreaterThanOrEqual(a.name, v))
    -        case GreaterThanOrEqual(Literal(v, t), Cast(a: Attribute, _)) =>
    -          Some(sources.LessThanOrEqual(a.name, v))
    -
    -        case LessThanOrEqual(a: Attribute, Literal(v, t)) =>
    -          Some(sources.LessThanOrEqual(a.name, v))
    -        case LessThanOrEqual(Literal(v, t), a: Attribute) =>
    -          Some(sources.GreaterThanOrEqual(a.name, v))
    -        case LessThanOrEqual(Cast(a: Attribute, _), Literal(v, t)) =>
    -          Some(sources.LessThanOrEqual(a.name, v))
    -        case LessThanOrEqual(Literal(v, t), Cast(a: Attribute, _)) =>
    -          Some(sources.GreaterThanOrEqual(a.name, v))
    -
    -        case others =>
    -          if (!or) {
    -            others.collect {
    -              case attr: AttributeReference =>
    -                attrList.add(AttributeReferenceWrapper(aliasMap.getOrElse(attr, attr)))
    -            }
    -          }
    -          None
    -      }
    -    }
    -    filters.flatMap(translate(_)).toArray
    -  }
    -
    -  def processExpression(exprs: Seq[Expression],
    -      attributesNeedToDecode: java.util.HashSet[AttributeReference],
    -      unprocessedExprs: ArrayBuffer[Expression],
    -      carbonTable: CarbonTable): Option[CarbonExpression] = {
    -    def transformExpression(expr: Expression, or: Boolean = false): Option[CarbonExpression]
= {
    -      expr match {
    -        case or@ Or(left, right) =>
    -          val leftFilter = transformExpression(left, or = true)
    -          val rightFilter = transformExpression(right, or = true)
    -          if (leftFilter.isDefined && rightFilter.isDefined) {
    -            Some(new OrExpression(leftFilter.get, rightFilter.get))
    -          } else {
    -            or.collect {
    -              case attr: AttributeReference => attributesNeedToDecode.add(attr)
    -            }
    -            unprocessedExprs += or
    -            None
    -          }
    -
    -        case And(left, right) =>
    -          (transformExpression(left) ++ transformExpression(right)).reduceOption(new
    -              AndExpression(_, _))
    -
    -        case EqualTo(a: Attribute, l@Literal(v, t)) =>
    -            Some(new EqualToExpression(transformExpression(a).get, transformExpression(l).get))
    -        case EqualTo(l@Literal(v, t), a: Attribute) =>
    -            Some(new EqualToExpression(transformExpression(a).get, transformExpression(l).get))
    -        case EqualTo(Cast(a: Attribute, _), l@Literal(v, t)) =>
    -            Some(new EqualToExpression(transformExpression(a).get, transformExpression(l).get))
    -        case EqualTo(l@Literal(v, t), Cast(a: Attribute, _)) =>
    -            Some(new EqualToExpression(transformExpression(a).get, transformExpression(l).get))
    -
    -        case Not(EqualTo(a: Attribute, l@Literal(v, t))) =>
    -            Some(new NotEqualsExpression(transformExpression(a).get, transformExpression(l).get))
    -        case Not(EqualTo(l@Literal(v, t), a: Attribute)) =>
    -            Some(new NotEqualsExpression(transformExpression(a).get, transformExpression(l).get))
    -        case Not(EqualTo(Cast(a: Attribute, _), l@Literal(v, t))) =>
    -            Some(new NotEqualsExpression(transformExpression(a).get, transformExpression(l).get))
    -        case Not(EqualTo(l@Literal(v, t), Cast(a: Attribute, _))) =>
    -            Some(new NotEqualsExpression(transformExpression(a).get, transformExpression(l).get))
    -        case IsNotNull(child: Attribute) =>
    -            Some(new NotEqualsExpression(transformExpression(child).get,
    -             transformExpression(Literal(null)).get, true))
    -        case IsNull(child: Attribute) =>
    -            Some(new EqualToExpression(transformExpression(child).get,
    -             transformExpression(Literal(null)).get, true))
    -        case Not(In(a: Attribute, list))
    -          if !list.exists(!_.isInstanceOf[Literal]) =>
    -          if (list.exists(x => isNullLiteral(x.asInstanceOf[Literal]))) {
    -            Some(new FalseExpression(transformExpression(a).get))
    -          } else {
    -            Some(new NotInExpression(transformExpression(a).get,
    -              new ListExpression(convertToJavaList(list.map(transformExpression(_).get)))))
    -          }
    -        case In(a: Attribute, list) if !list.exists(!_.isInstanceOf[Literal]) =>
    -          Some(new InExpression(transformExpression(a).get,
    -            new ListExpression(convertToJavaList(list.map(transformExpression(_).get)))))
    -        case Not(In(Cast(a: Attribute, _), list))
    -          if !list.exists(!_.isInstanceOf[Literal]) =>
    -          /* if any illogical expression comes in NOT IN Filter like
    -           NOT IN('scala',NULL) this will be treated as false expression and will
    -           always return no result. */
    -          if (list.exists(x => isNullLiteral(x.asInstanceOf[Literal]))) {
    -            Some(new FalseExpression(transformExpression(a).get))
    -          } else {
    -            Some(new NotInExpression(transformExpression(a).get, new ListExpression(
    -              convertToJavaList(list.map(transformExpression(_).get)))))
    -          }
    -        case In(Cast(a: Attribute, _), list) if !list.exists(!_.isInstanceOf[Literal])
=>
    -          Some(new InExpression(transformExpression(a).get,
    -            new ListExpression(convertToJavaList(list.map(transformExpression(_).get)))))
    -
    -        case GreaterThan(a: Attribute, l@Literal(v, t)) =>
    -          Some(new GreaterThanExpression(transformExpression(a).get, transformExpression(l).get))
    -        case GreaterThan(Cast(a: Attribute, _), l@Literal(v, t)) =>
    -          Some(new GreaterThanExpression(transformExpression(a).get, transformExpression(l).get))
    -        case GreaterThan(l@Literal(v, t), a: Attribute) =>
    -          Some(new LessThanExpression(transformExpression(a).get, transformExpression(l).get))
    -        case GreaterThan(l@Literal(v, t), Cast(a: Attribute, _)) =>
    -          Some(new LessThanExpression(transformExpression(a).get, transformExpression(l).get))
    -
    -        case LessThan(a: Attribute, l@Literal(v, t)) =>
    -          Some(new LessThanExpression(transformExpression(a).get, transformExpression(l).get))
    -        case LessThan(Cast(a: Attribute, _), l@Literal(v, t)) =>
    -          Some(new LessThanExpression(transformExpression(a).get, transformExpression(l).get))
    -        case LessThan(l@Literal(v, t), a: Attribute) =>
    -          Some(new GreaterThanExpression(transformExpression(a).get, transformExpression(l).get))
    -        case LessThan(l@Literal(v, t), Cast(a: Attribute, _)) =>
    -          Some(new GreaterThanExpression(transformExpression(a).get, transformExpression(l).get))
    -
    -        case GreaterThanOrEqual(a: Attribute, l@Literal(v, t)) =>
    -          Some(new GreaterThanEqualToExpression(transformExpression(a).get,
    -            transformExpression(l).get))
    -        case GreaterThanOrEqual(Cast(a: Attribute, _), l@Literal(v, t)) =>
    -          Some(new GreaterThanEqualToExpression(transformExpression(a).get,
    -            transformExpression(l).get))
    -        case GreaterThanOrEqual(l@Literal(v, t), a: Attribute) =>
    -          Some(new LessThanEqualToExpression(transformExpression(a).get,
    -            transformExpression(l).get))
    -        case GreaterThanOrEqual(l@Literal(v, t), Cast(a: Attribute, _)) =>
    -          Some(new LessThanEqualToExpression(transformExpression(a).get,
    -            transformExpression(l).get))
    -
    -        case LessThanOrEqual(a: Attribute, l@Literal(v, t)) =>
    -          Some(new LessThanEqualToExpression(transformExpression(a).get,
    -            transformExpression(l).get))
    -        case LessThanOrEqual(Cast(a: Attribute, _), l@Literal(v, t)) =>
    -          Some(new LessThanEqualToExpression(transformExpression(a).get,
    -            transformExpression(l).get))
    -        case LessThanOrEqual(l@Literal(v, t), a: Attribute) =>
    -          Some(new GreaterThanEqualToExpression(transformExpression(a).get,
    -            transformExpression(l).get))
    -        case LessThanOrEqual(l@Literal(v, t), Cast(a: Attribute, _)) =>
    -          Some(new GreaterThanEqualToExpression(transformExpression(a).get,
    -            transformExpression(l).get))
    -
    -        case AttributeReference(name, dataType, _, _) =>
    -          Some(new CarbonColumnExpression(name,
    -            CarbonScalaUtil.convertSparkToCarbonDataType(
    -              getActualCarbonDataType(name, carbonTable))))
    -        case Literal(name, dataType) => Some(new
    -            CarbonLiteralExpression(name, CarbonScalaUtil.convertSparkToCarbonDataType(dataType)))
    -        case Cast(left, right) if !left.isInstanceOf[Literal] => transformExpression(left)
    -        case others =>
    -          if (!or) {
    -            others.collect {
    -              case attr: AttributeReference => attributesNeedToDecode.add(attr)
    -            }
    -            unprocessedExprs += others
    -          }
    -          None
    -      }
    -    }
    -    exprs.flatMap(transformExpression(_)).reduceOption(new AndExpression(_, _))
    --- End diff --
    
    The 2nd parameter in transformExpression() is false by default thus transformExpression(_)
equals to transformExpression(_, false).


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