westonpace commented on code in PR #34651:
URL: https://github.com/apache/arrow/pull/34651#discussion_r1198951614
##########
cpp/src/arrow/engine/substrait/relation_internal.cc:
##########
@@ -714,6 +731,96 @@ Result<DeclarationInfo> FromProto(const substrait::Rel&
rel, const ExtensionSet&
return ProcessEmit(join, join_declaration, join_schema);
}
+ case substrait::Rel::RelTypeCase::kFetch: {
+ const auto& fetch = rel.fetch();
+ RETURN_NOT_OK(CheckRelCommon(fetch, conversion_options));
+
+ if (!fetch.has_input()) {
+ return Status::Invalid("substrait::FetchRel with no input relation");
+ }
+
+ ARROW_ASSIGN_OR_RAISE(auto input,
+ FromProto(fetch.input(), ext_set,
conversion_options));
+
+ int64_t offset = fetch.offset();
+ int64_t count = fetch.count();
+
+ acero::Declaration fetch_dec{
+ "fetch", {input.declaration}, acero::FetchNodeOptions(offset,
count)};
+
+ DeclarationInfo fetch_declaration{std::move(fetch_dec),
input.output_schema};
+ return ProcessEmit(fetch, std::move(fetch_declaration),
+ fetch_declaration.output_schema);
+ }
+ case substrait::Rel::RelTypeCase::kSort: {
+ const auto& sort = rel.sort();
+ RETURN_NOT_OK(CheckRelCommon(sort, conversion_options));
+
+ if (!sort.has_input()) {
+ return Status::Invalid("substrait::SortRel with no input relation");
+ }
+
+ ARROW_ASSIGN_OR_RAISE(auto input,
+ FromProto(sort.input(), ext_set,
conversion_options));
+
+ if (sort.sorts_size() == 0) {
+ return Status::Invalid("substrait::SortRel with no sorts");
+ }
+
+ std::vector<compute::SortKey> sort_keys;
+ compute::NullPlacement null_placement;
+ bool first = true;
+ for (const auto& sort : sort.sorts()) {
+ if (sort.direction() == substrait::SortField::SortDirection::
+
SortField_SortDirection_SORT_DIRECTION_UNSPECIFIED) {
+ return Status::Invalid(
+ "substrait::SortRel with sort that had unspecified direction");
+ }
+ if (sort.direction() == substrait::SortField::SortDirection::
+
SortField_SortDirection_SORT_DIRECTION_CLUSTERED) {
+ return Status::NotImplemented(
+ "substrait::SortRel with sort with clustered sort direction");
+ }
+ // Substrait allows null placement to differ for each field. Acero
expects it to
+ // be consistent across all fields. So we grab the null placement
from the first
+ // key and verify all other keys have the same null placement
+ if (first) {
+ null_placement = IsSortNullsFirst(sort.direction())
+ ? compute::NullPlacement::AtStart
+ : compute::NullPlacement::AtEnd;
+ first = false;
+ } else {
+ if ((null_placement == compute::NullPlacement::AtStart &&
+ !IsSortNullsFirst(sort.direction())) ||
+ (null_placement == compute::NullPlacement::AtEnd &&
+ IsSortNullsFirst(sort.direction()))) {
Review Comment:
I've cleaned this up.
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