| /* |
| * 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.core.scan.filter.resolver.resolverinfo.visitor; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.carbondata.core.constants.CarbonCommonConstants; |
| import org.apache.carbondata.core.scan.expression.conditional.EqualToExpression; |
| import org.apache.carbondata.core.scan.expression.exception.FilterIllegalMemberException; |
| import org.apache.carbondata.core.scan.expression.exception.FilterUnsupportedException; |
| import org.apache.carbondata.core.scan.filter.ColumnFilterInfo; |
| import org.apache.carbondata.core.scan.filter.FilterUtil; |
| import org.apache.carbondata.core.scan.filter.resolver.metadata.FilterResolverMetadata; |
| import org.apache.carbondata.core.scan.filter.resolver.resolverinfo.ColumnResolvedFilterInfo; |
| import org.apache.carbondata.core.scan.filter.resolver.resolverinfo.MeasureColumnResolvedFilterInfo; |
| |
| public class MeasureColumnVisitor implements ResolvedFilterInfoVisitorIntf { |
| |
| /** |
| * Visitor Method will update the filter related details in visitableObj, For no dictionary |
| * type columns the filter members will resolved directly, no need to look up in dictionary |
| * since it will not be part of dictionary, directly the actual data can be converted as |
| * byte[] and can be set. this type of encoding is effective when the particular column |
| * is having very high cardinality. |
| * |
| * @param visitableObj |
| * @param metadata |
| * @throws FilterUnsupportedException,if exception occurs while evaluating |
| * filter models. |
| */ |
| public void populateFilterResolvedInfo(ColumnResolvedFilterInfo visitableObj, |
| FilterResolverMetadata metadata) throws FilterUnsupportedException { |
| if (visitableObj instanceof MeasureColumnResolvedFilterInfo) { |
| MeasureColumnResolvedFilterInfo resolveDimension = |
| (MeasureColumnResolvedFilterInfo) visitableObj; |
| ColumnFilterInfo resolvedFilterObject = null; |
| List<String> evaluateResultListFinal = new ArrayList<>(1); |
| try { |
| // handling for is null case scenarios |
| if (metadata.getExpression() instanceof EqualToExpression) { |
| EqualToExpression expression = (EqualToExpression) metadata.getExpression(); |
| if (expression.isNull) { |
| evaluateResultListFinal = new ArrayList<>(1); |
| evaluateResultListFinal.add(CarbonCommonConstants.MEMBER_DEFAULT_VAL); |
| } |
| } else { |
| evaluateResultListFinal = metadata.getExpression().evaluate(null).getListAsString(); |
| } |
| // Adding default null member inorder to not display the same while |
| // displaying the report as per hive compatibility. |
| if (!metadata.isIncludeFilter() && !evaluateResultListFinal |
| .contains(CarbonCommonConstants.MEMBER_DEFAULT_VAL)) { |
| evaluateResultListFinal.add(CarbonCommonConstants.MEMBER_DEFAULT_VAL); |
| } |
| } catch (FilterIllegalMemberException e) { |
| throw new FilterUnsupportedException(e); |
| } |
| resolvedFilterObject = FilterUtil |
| .getMeasureValKeyMemberForFilter(evaluateResultListFinal, metadata.isIncludeFilter(), |
| metadata.getColumnExpression().getDataType(), resolveDimension.getMeasure()); |
| resolveDimension.setFilterValues(resolvedFilterObject); |
| } |
| } |
| } |