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From zuyu <...@git.apache.org>
Subject [GitHub] incubator-quickstep pull request #49: QUICKSTEP-20: Added ExecutionGenerator...
Date Thu, 07 Jul 2016 19:51:44 GMT
Github user zuyu commented on a diff in the pull request:

    https://github.com/apache/incubator-quickstep/pull/49#discussion_r69974697
  
    --- Diff: query_optimizer/ExecutionGenerator.cpp ---
    @@ -1639,5 +1641,101 @@ void ExecutionGenerator::convertTableGenerator(
       temporary_relation_info_vec_.emplace_back(tablegen_index, output_relation);
     }
     
    +void ExecutionGenerator::convertWindowAggregate(
    +    const P::WindowAggregatePtr &physical_plan) {
    +  // Create window_aggregation_operation_state proto.
    +  const QueryContext::window_aggregation_state_id window_aggr_state_index =
    +      query_context_proto_->window_aggregation_states_size();
    +  S::WindowAggregationOperationState *window_aggr_state_proto =
    +      query_context_proto_->add_window_aggregation_states();
    +
    +  // Get input.
    +  const CatalogRelationInfo *input_relation_info =
    +      findRelationInfoOutputByPhysical(physical_plan->input());
    +  window_aggr_state_proto->set_relation_id(input_relation_info->relation->getID());
    +
    +  // Get window aggregate function expression.
    +  const E::AliasPtr &named_window_aggregate_expression =
    +      physical_plan->window_aggregate_expression();
    +  const E::WindowAggregateFunctionPtr &window_aggregate_function =
    +      std::static_pointer_cast<const E::WindowAggregateFunction>(
    +          named_window_aggregate_expression->expression());
    +
    +  // Set the AggregateFunction.
    +  window_aggr_state_proto->mutable_function()->CopyFrom(
    +      window_aggregate_function->window_aggregate().getProto());
    +
    +  // Set the arguments.
    +  for (const E::ScalarPtr &argument : window_aggregate_function->arguments())
{
    +    unique_ptr<const Scalar> concretized_argument(argument->concretize(attribute_substitution_map_));
    +    window_aggr_state_proto->add_arguments()->CopyFrom(concretized_argument->getProto());
    +  }
    +
    +  // Set partition keys.
    +  const E::WindowInfo window_info = window_aggregate_function->window_info();
    +  for (const E::ScalarPtr &partition_by_attribute
    +      : window_info.partition_by_attributes) {
    +    unique_ptr<const Scalar> concretized_partition_by_attribute(
    +        partition_by_attribute->concretize(attribute_substitution_map_));
    +    window_aggr_state_proto->add_partition_by_attributes()
    +        ->CopyFrom(concretized_partition_by_attribute->getProto());
    +  }
    +
    +  // Set window frame info.
    +  if (window_info.frame_info == nullptr) {
    +    // If the frame is not specified, use the default setting:
    +    //   1. If ORDER BY key is specified, use cumulative aggregation:
    +    //      ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW.
    +    //   2. If ORDER BY key is not specified either, use the whole partition:
    +    //      ROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING.
    +    window_aggr_state_proto->set_is_row(true);        /* frame mode: ROWS */
    +    window_aggr_state_proto->set_num_preceding(-1);    /* UNBOUNDED PRECEDING */
    +    if (window_info.order_by_attributes.empty()) {
    +      window_aggr_state_proto->set_num_following(-1);  /* UNBOUNDED FOLLOWING */
    +    } else {
    +      window_aggr_state_proto->set_num_following(0);   /* CURRENT ROW */
    +    }
    +  } else {
    +    const E::WindowFrameInfo* window_frame_info = window_info.frame_info;
    --- End diff --
    
    Code style: `const E::WindowFrameInfo *window_frame_info`.


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