westonpace commented on code in PR #13914:
URL: https://github.com/apache/arrow/pull/13914#discussion_r959817640
##########
cpp/src/arrow/engine/substrait/relation_internal.cc:
##########
@@ -199,12 +217,22 @@ Result<DeclarationInfo> FromProto(const substrait::Rel&
rel, const ExtensionSet&
std::move(filesystem),
std::move(files),
std::move(format), {}));
- ARROW_ASSIGN_OR_RAISE(auto ds,
ds_factory->Finish(std::move(base_schema)));
+ ARROW_ASSIGN_OR_RAISE(auto ds, ds_factory->Finish(base_schema));
- return DeclarationInfo{
- compute::Declaration{
- "scan", dataset::ScanNodeOptions{std::move(ds),
std::move(scan_options)}},
- num_columns};
+ if (HasEmit(read)) {
+ ARROW_ASSIGN_OR_RAISE(auto emit_expressions, GetEmitInfo(read,
base_schema));
+ return DeclarationInfo{
+ compute::Declaration::Sequence(
+ {{"scan",
+ dataset::ScanNodeOptions{std::move(ds),
std::move(scan_options)}},
+ {"project",
compute::ProjectNodeOptions{std::move(emit_expressions)}}}),
+ static_cast<int>(emit_expressions.size()), std::move(base_schema)};
+ } else {
Review Comment:
That is a correct interpretation.
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