| /* |
| * 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.optimizer |
| |
| import org.apache.spark.sql.catalyst.expressions.{Alias, AttributeReference, PredicateHelper, |
| ScalaUDF} |
| import org.apache.spark.sql.catalyst.plans.logical.{Filter, Join, LogicalPlan, Project} |
| import org.apache.spark.sql.catalyst.rules.Rule |
| import org.apache.spark.sql.execution.datasources.LogicalRelation |
| import org.apache.spark.sql.types.StringType |
| |
| import org.apache.carbondata.core.constants.CarbonCommonConstants |
| |
| class CarbonUDFTransformRule extends Rule[LogicalPlan] with PredicateHelper { |
| override def apply(plan: LogicalPlan): LogicalPlan = { |
| pushDownUDFToJoinLeftRelation(plan) |
| } |
| |
| private def pushDownUDFToJoinLeftRelation(plan: LogicalPlan): LogicalPlan = { |
| val output = plan.transform { |
| case proj@Project(cols, Join( |
| left, right, jointype: org.apache.spark.sql.catalyst.plans.JoinType, condition)) => |
| var projectionToBeAdded: Seq[org.apache.spark.sql.catalyst.expressions.Alias] = Seq.empty |
| var udfExists = false |
| val newCols = cols.map { |
| case a@Alias(s: ScalaUDF, name) |
| if name.equalsIgnoreCase(CarbonCommonConstants.POSITION_ID) || |
| name.equalsIgnoreCase(CarbonCommonConstants.CARBON_IMPLICIT_COLUMN_TUPLEID) => |
| udfExists = true |
| projectionToBeAdded :+= a |
| AttributeReference(name, StringType, nullable = true)().withExprId(a.exprId) |
| case other => other |
| } |
| if (udfExists) { |
| val newLeft = left match { |
| case Project(columns, logicalPlan) => |
| Project(columns ++ projectionToBeAdded, logicalPlan) |
| case filter: Filter => |
| Project(filter.output ++ projectionToBeAdded, filter) |
| case relation: LogicalRelation => |
| Project(relation.output ++ projectionToBeAdded, relation) |
| case other => other |
| } |
| Project(newCols, Join(newLeft, right, jointype, condition)) |
| } else { |
| proj |
| } |
| case other => other |
| } |
| output |
| } |
| |
| } |