pitrou commented on code in PR #13528:
URL: https://github.com/apache/arrow/pull/13528#discussion_r917912040
##########
cpp/src/arrow/engine/substrait/relation_internal.cc:
##########
@@ -215,16 +220,24 @@ Result<compute::Declaration> FromProto(const
substrait::Rel& rel,
}
ARROW_ASSIGN_OR_RAISE(auto input, FromProto(project.input(), ext_set));
+ // NOTE: Substrait ProjectRels *append* columns, while Acero's project
node replaces
+ // them. Therefore, we need to prefix all the current columns for
compatibility.
std::vector<compute::Expression> expressions;
Review Comment:
May want to presize this?
##########
cpp/src/arrow/engine/substrait/relation_internal.h:
##########
@@ -30,8 +30,17 @@
namespace arrow {
namespace engine {
+/// Information resulting from converting a Substrait relation.
+struct DeclarationInfo {
+ /// The compute declaration produced thus far.
+ compute::Declaration declaration;
+
+ /// The number of columns returned by the declaration.
+ size_t num_columns;
Review Comment:
Right, this can be an `int`.
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