jvanstraten commented on code in PR #13528:
URL: https://github.com/apache/arrow/pull/13528#discussion_r918390405


##########
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:
   96f8c93



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