message: normalize column names for Redshift
diff: @@ -424,6 +424,10 @@ class VerticaEngineSpec(PostgresBaseEngineSpec):
  class RedshiftEngineSpec(PostgresBaseEngineSpec):
  engine = 'redshift'
  + @staticmethod
  + def normalize_column_name(column_name):
  + return column_name.lower()
  +
  class OracleEngineSpec(PostgresBaseEngineSpec):
  engine = 'oracle'
  