vibhatha commented on code in PR #14071:
URL: https://github.com/apache/arrow/pull/14071#discussion_r965443558


##########
cpp/src/arrow/engine/substrait/relation_internal.cc:
##########
@@ -52,159 +55,239 @@ Status CheckRelCommon(const RelMessage& rel) {
   return Status::OK();
 }
 
-Result<DeclarationInfo> FromProto(const substrait::Rel& rel, const 
ExtensionSet& ext_set,
-                                  const ConversionOptions& conversion_options) 
{
-  static bool dataset_init = false;
-  if (!dataset_init) {
-    dataset_init = true;
-    dataset::internal::Initialize();
+Status CheckReadRelation(const substrait::ReadRel& rel,

Review Comment:
   doubt: at a certain point, these unimplemented once will be implemented and 
the use of this function wouldn't be very useful. Wouldn't it be better to 
leave them within the main function where we do the rest of the tasks? 



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