text:     SELECT {% for col in join_cols %}joined.{{ col }},
             {% endfor %}joined.x_{{ column }},
             joined.y_{{ column }}
        FROM {{ joined_schema }}.{{ joined_table }} joined
  INNER JOIN (
      SELECT {{ join_cols|join(", ") }}
        FROM {{ diff_schema }}.{{ diff_table }}
       WHERE column_name = '{{ column }}'
    GROUP BY {{ join_cols|join(", ") }}
             ) diff
             ON {{ join_cols_join }}