Merge pull request #750 from aidanharan/fix-table-from-statement-join

Rails 6: Correctly retrieve Arel::Table in join queries

Author: wpolicarpo

lib/arel/visitors/sqlserver.rb

@@ -202,7 +202,7 @@ def table_From_Statement o
         elsif Arel::Nodes::SqlLiteral === core.from
           Arel::Table.new(core.from)
         elsif Arel::Nodes::JoinSource === core.source
-          Arel::Nodes::SqlLiteral === core.source.left ? Arel::Table.new(core.source.left, @engine) : core.source.left
+          Arel::Nodes::SqlLiteral === core.source.left ? Arel::Table.new(core.source.left, @engine) : core.source.left.left
         end
       end