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-rw-r--r--activerecord/lib/active_record/relation/calculations.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/relation/calculations.rb b/activerecord/lib/active_record/relation/calculations.rb
index eaaa409636..c8ebb41131 100644
--- a/activerecord/lib/active_record/relation/calculations.rb
+++ b/activerecord/lib/active_record/relation/calculations.rb
@@ -254,6 +254,7 @@ module ActiveRecord
select_value = operation_over_aggregate_column(column, operation, distinct)
column_alias = select_value.alias
+ column_alias ||= @klass.connection.column_name_for_operation(operation, select_value)
relation.select_values = [select_value]
query_builder = relation.arel