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   * 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
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   * KIND, either express or implied.  See the License for the
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  package org.apache.asterix.metadata.utils.filter;
  
  import org.apache.asterix.column.filter.NoOpColumnFilterEvaluatorFactory;
  import org.apache.asterix.column.filter.iterable.IColumnIterableFilterEvaluatorFactory;
  import org.apache.asterix.column.filter.iterable.accessor.ColumnFilterValueAccessorEvaluatorFactory;
  import org.apache.asterix.column.filter.iterable.evaluator.ColumnIterableFilterEvaluatorFactory;
  import org.apache.asterix.om.types.ARecordType;
  import org.apache.asterix.runtime.projection.ColumnDatasetProjectionFiltrationInfo;
  import org.apache.hyracks.algebricks.common.exceptions.AlgebricksException;
  import org.apache.hyracks.algebricks.core.algebra.base.ILogicalExpression;
  import org.apache.hyracks.algebricks.core.algebra.expressions.IVariableTypeEnvironment;
  import org.apache.hyracks.algebricks.core.jobgen.impl.JobGenContext;
  import org.apache.hyracks.algebricks.runtime.base.IScalarEvaluatorFactory;
  
  public class ColumnFilterBuilder extends AbstractFilterBuilder {
  
      public ColumnFilterBuilder(ColumnDatasetProjectionFiltrationInfo projectionFiltrationInfo, JobGenContext context,
              IVariableTypeEnvironment typeEnv) {
          super(projectionFiltrationInfo.getFilterPaths(), projectionFiltrationInfo.getFilterExpression(), context,
                  typeEnv);
      }
  
      public IColumnIterableFilterEvaluatorFactory build() throws AlgebricksException {
          if (filterExpression == null || filterPaths.isEmpty()) {
              return NoOpColumnFilterEvaluatorFactory.INSTANCE;
          }
          IScalarEvaluatorFactory evalFactory = createEvaluator(filterExpression);
          if (evalFactory == null) {
              return NoOpColumnFilterEvaluatorFactory.INSTANCE;
          }
          return new ColumnIterableFilterEvaluatorFactory(evalFactory);
      }
  
      @Override
      protected IScalarEvaluatorFactory createValueAccessor(ILogicalExpression expression) {
          ARecordType path = filterPaths.get(expression);
          return new ColumnFilterValueAccessorEvaluatorFactory(path);
      }
  }
  