vibhatha commented on code in PR #13130:
URL: https://github.com/apache/arrow/pull/13130#discussion_r914365089
##########
cpp/src/arrow/engine/substrait/relation_internal.cc:
##########
@@ -309,6 +309,75 @@ Result<compute::Declaration> FromProto(const
substrait::Rel& rel,
join_dec.inputs.emplace_back(std::move(right));
return std::move(join_dec);
}
+ case substrait::Rel::RelTypeCase::kAggregate: {
+ const auto& aggregate = rel.aggregate();
+ RETURN_NOT_OK(CheckRelCommon(aggregate));
+
+ if (!aggregate.has_input()) {
+ return Status::Invalid("substrait::AggregateRel with no input
relation");
+ }
+
+ ARROW_ASSIGN_OR_RAISE(auto input, FromProto(aggregate.input(), ext_set));
+
+ if (aggregate.groupings_size() > 1) {
+ return Status::Invalid("Grouping sets not supported.");
+ }
+ std::vector<FieldRef> keys;
+ auto group = aggregate.groupings(0);
+ keys.reserve(group.grouping_expressions_size());
+ for (int exp_id = 0; exp_id < group.grouping_expressions_size();
exp_id++) {
+ const auto& expr = FromProto(group.grouping_expressions(exp_id),
ext_set);
+ const auto& field_ref = expr->field_ref();
+ if (field_ref) {
+ keys.emplace_back(std::move(*field_ref));
+ } else {
+ return Status::Invalid(
+ "Only accept a direct reference as the grouping expression for
aggregates");
+ }
+ }
+ // denotes how many unique aggregation functions are used
+ // measure_id refers to the corresponding function in the
+ // extensionsion
+ int measure_size = aggregate.measures_size();
+ std::vector<compute::Aggregate> aggregates;
+ aggregates.reserve(measure_size);
+ for (int measure_id = 0; measure_id < measure_size; measure_id++) {
+ const auto& agg_measure = aggregate.measures(measure_id);
+ if (agg_measure.has_measure()) {
+ if (agg_measure.has_filter()) {
+ return Status::Invalid("Aggregate filters are not supported.");
+ }
+ const auto& agg_func = agg_measure.measure();
+ if (agg_func.args_size() != 1) {
+ return Status::Invalid("Aggregate function must be a unary
function.");
+ }
+ int func_reference = agg_func.function_reference();
+ ARROW_ASSIGN_OR_RAISE(auto func_record,
ext_set.DecodeFunction(func_reference));
+ // aggreagte function name
+ auto func_name = std::string(func_record.id.name);
+ // aggregate output column name
+ std::string agg_col_name =
+ func_name + "(" + std::to_string(func_reference) + ")";
Review Comment:
You have a good point there, I just added it for some readability. We can
ignore it too.
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: [email protected]
For queries about this service, please contact Infrastructure at:
[email protected]
