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From zzcclp <...@git.apache.org>
Subject [GitHub] incubator-carbondata pull request #492: [CARBONDATA-440] Providing the updat...
Date Fri, 06 Jan 2017 17:42:48 GMT
Github user zzcclp commented on a diff in the pull request:

    https://github.com/apache/incubator-carbondata/pull/492#discussion_r94986558
  
    --- Diff: integration/spark/src/main/scala/org/apache/spark/sql/hive/CarbonAnalysisRules.scala
---
    @@ -0,0 +1,173 @@
    +/*
    + * 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.hive
    +
    +import org.apache.spark.sql._
    +import org.apache.spark.sql.catalyst.CarbonTableIdentifierImplicit
    +import org.apache.spark.sql.catalyst.analysis.{UnresolvedAlias, UnresolvedFunction, UnresolvedRelation,
UnresolvedStar}
    +import org.apache.spark.sql.catalyst.expressions.Alias
    +import org.apache.spark.sql.catalyst.plans.Inner
    +import org.apache.spark.sql.catalyst.plans.logical._
    +import org.apache.spark.sql.catalyst.rules._
    +import org.apache.spark.sql.execution.command.ProjectForDeleteCommand
    +import org.apache.spark.sql.execution.datasources.LogicalRelation
    +
    +import org.apache.carbondata.core.constants.CarbonCommonConstants
    +
    +/**
    + * Insert into carbon table from other source
    + */
    +object CarbonPreInsertionCasts extends Rule[LogicalPlan] {
    +    def apply(plan: LogicalPlan): LogicalPlan = plan.transform {
    +      // Wait until children are resolved.
    +      case p: LogicalPlan if !p.childrenResolved => p
    +
    +      case p @ InsertIntoTable(relation: LogicalRelation, _, child, _, _)
    +           if relation.relation.isInstanceOf[CarbonDatasourceRelation] =>
    +        castChildOutput(p, relation.relation.asInstanceOf[CarbonDatasourceRelation],
child)
    +    }
    +
    +    def castChildOutput(p: InsertIntoTable, relation: CarbonDatasourceRelation, child:
LogicalPlan)
    +      : LogicalPlan = {
    +      if (relation.carbonRelation.output.size > CarbonCommonConstants
    +        .DEFAULT_MAX_NUMBER_OF_COLUMNS) {
    +        sys
    +          .error("Maximum supported column by carbon is:" + CarbonCommonConstants
    +            .DEFAULT_MAX_NUMBER_OF_COLUMNS
    +          )
    +      }
    +      if (child.output.size >= relation.carbonRelation.output.size ) {
    +        InsertIntoCarbonTable(relation, p.partition, p.child, p.overwrite, p.ifNotExists)
    +      } else {
    +         sys.error("Cannot insert into target table because column number are different")
    +      }
    +    }
    +  }
    +
    +object CarbonIUDAnalysisRule extends Rule[LogicalPlan] {
    +
    +  var sqlContext: SQLContext = _
    +
    +  def init(sqlContext: SQLContext) {
    +    this.sqlContext = sqlContext
    +  }
    +
    +  private def processUpdateQuery(
    +                   table: UnresolvedRelation,
    +                   columns: List[String],
    +                   selectStmt: String,
    +                   filter: String): LogicalPlan = {
    +    var includedDestColumns = false
    +    var includedDestRelation = false
    +    var addedTupleId = false
    +
    +    def prepareTargetReleation(relation: UnresolvedRelation): Subquery = {
    +      val tupleId = UnresolvedAlias(Alias(UnresolvedFunction("getTupleId",
    +        Seq.empty, isDistinct = false), "tupleId")())
    +      val projList = Seq(
    +        UnresolvedAlias(UnresolvedStar(table.alias)), tupleId)
    +      // include tuple id and rest of the required columns in subqury
    +      Subquery(table.alias.getOrElse(""), Project(projList, relation))
    +    }
    +    // get the un-analyzed logical plan
    +    val targetTable = prepareTargetReleation(table)
    +    val selectPlan = org.apache.spark.sql.SQLParser.parse(selectStmt, sqlContext) transform
{
    +      case Project(projectList, child) if (!includedDestColumns) =>
    +        includedDestColumns = true
    +        if (projectList.size != columns.size) {
    +          sys.error("Number of source and destination columns are not matching")
    +        }
    +        val renamedProjectList = projectList.zip(columns).map{ case(attr, col) =>
    +          attr match {
    +            case UnresolvedAlias(child) =>
    +              UnresolvedAlias(Alias(child, col + "-updatedColumn")())
    +            case _ => attr
    +          }
    +        }
    +        val list = Seq(
    +          UnresolvedAlias(UnresolvedStar(table.alias))) ++ renamedProjectList
    +        Project(list, child)
    +      case Filter(cond, child) if (!includedDestRelation) =>
    +        includedDestRelation = true
    +        Filter(cond, Join(child, targetTable, Inner, None))
    +      case r @ UnresolvedRelation(t, a) if (!includedDestRelation &&
    +        t != table.tableIdentifier) =>
    +        includedDestRelation = true
    +        Join(r, targetTable, Inner, None)
    +    }
    +    val updatedSelectPlan = if (!includedDestRelation) {
    +      // special case to handle self join queries
    +      // Eg. update tableName  SET (column1) = (column1+1)
    +      selectPlan transform {
    +        case relation: UnresolvedRelation if (table.tableIdentifier == relation.tableIdentifier
&&
    +          addedTupleId == false) =>
    +          addedTupleId = true
    +          targetTable
    +      }
    +    } else {
    +      selectPlan
    +    }
    +    val finalPlan = if (filter.length > 0) {
    +      val alias = table.alias.getOrElse("")
    +      var transformed: Boolean = false
    +      // Create a dummy projection to include filter conditions
    +      SQLParser.parse("select * from  " +
    +        table.tableIdentifier.mkString(".") + " " + alias + " " + filter, sqlContext)
 transform {
    +        case UnresolvedRelation(t, Some(a)) if (
    +          !transformed && t == table.tableIdentifier && a == alias) =>
    +          transformed = true
    +          // Add the filter condition of update statement  on destination table
    +          Subquery(alias, updatedSelectPlan)
    +      }
    +    } else {
    +      updatedSelectPlan
    +    }
    +    val tid = CarbonTableIdentifierImplicit.toTableIdentifier(table.tableIdentifier)
    +    val tidSeq = Seq(getDB.getDatabaseName(tid.database, sqlContext), tid.table)
    +    val destinationTable = UnresolvedRelation(tidSeq, table.alias)
    +    ProjectForUpdate(destinationTable, columns, Seq(finalPlan))
    +  }
    +
    +  def processDeleteRecordsQuery(selectStmt: String, table: UnresolvedRelation): LogicalPlan
= {
    +    val tid = CarbonTableIdentifierImplicit.toTableIdentifier(table.tableIdentifier)
    --- End diff --
    
    As described above


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