Geo: Fix FDW schema check when tables and columns are not in the same order

ee/changelogs/unreleased/sh-improve-fdw-comparison.yml

+---
+title: 'Geo: Fix FDW schema check when tables and columns are not in the same order'
+merge_request:
+author:
+type: fixed

ee/lib/gitlab/geo/fdw.rb

@@ -75,7 +75,7 @@ module Gitlab
         Gitlab::Geo.cache_value(:geo_fdw_schema_tables_match) do
           schema = gitlab_schema
 
-          schema.present? && schema == fdw_schema
+          schema.present? && (schema.to_set == fdw_schema.to_set)
         end
       end
 

ee/spec/lib/gitlab/geo/fdw_spec.rb

@@ -172,6 +172,19 @@ describe Gitlab::Geo::Fdw, :geo do
         # rake geo:db:test:refresh_foreign_tables
         expect(described_class.foreign_schema_tables_match?).to be_truthy
       end
+
+      it 'returns true if order is different' do
+        one_schema = [
+          { "table_name" => "events", "column_name" => "target_type", "data_type" => "character varying" },
+          { "table_name" => "ci_job_artifacts", "column_name" => "id", "data_type" => "integer" }
+        ]
+        second_schema = one_schema.reverse
+
+        allow(described_class).to receive(:gitlab_schema).and_return(one_schema)
+        allow(described_class).to receive(:fdw_schema).and_return(second_schema)
+
+        expect(described_class.foreign_schema_tables_match?).to be_truthy
+      end
     end
   end
 end