Examples of org.apache.pig.Expression$UnaryExpression

org.apache.pig.Expression
A class to communicate Filter expressions to LoadFuncs. @since Pig 0.7

          LogicalExpressionPlan filterExprCopy = filterExpr.deepCopy();
          
          PColFilterExtractor pColFilterFinder = new PColFilterExtractor(
                  filterExprCopy, getMappedKeys( partitionKeys ) );
          pColFilterFinder.visit();
          Expression partitionFilter = pColFilterFinder.getPColCondition();
          
          if(partitionFilter != null) {
            // the column names in the filter may be the ones provided by
            // the user in the schema in the load statement - we may need
            // to replace them with partition column names as given by

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   * @return the condition on partition columns extracted from filter
   */
  public  Expression getPColCondition(){
    if(!canPushDown || pColConditions.size() == 0)
        return null;
    Expression cond =  pColConditions.get(0);
    for(int i=1; i<pColConditions.size(); i++){
      //if there is more than one condition expression
      // connect them using "AND"s
      cond = new Expression.BinaryExpression(cond, pColConditions.get(i),
                    OpType.OP_AND);

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org.apache.pig.builtin.TestOrcStoragePushdown

org.apache.pig.impl.logicalLayer.optimizer.PartitionFilterOptimizer

org.apache.pig.impl.logicalLayer.PColFilterExtractor

org.apache.pig.newplan.logical.rules.PartitionFilterOptimizer$NewPartitionFilterPushDownTransformer

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