gp批量字段大写转小写

CREATE OR REPLACE FUNCTION "ods"."transbln"()
  RETURNS "pg_catalog"."void" AS $BODY$
DECLARE
    v_rec record;
BEGIN
-- ==================================================================================
--    让读书成为一种生活方式。就像吃喝拉撒每天必须要干的事，
-- 终有一天你的举止、言谈、气质会不一样。
--                                        —- async
--
-- Created Date: Sunday, 2020-05-19, 3:48:04 pm
-- copyright (c):    SZWW Tech. LTD.
-- Engineer:   async
-- Module Name:
-- Revision:   v0.01
-- Description:
--
-- Revision History :
-- Revision     editor         date         Description
-- v0.01        async          2020-05-19   File Created
-- ==================================================================================
FOR v_rec IN( SELECT 'alter table '||table_schema||'.'||table_name||' rename column '||'"'||column_name||'"'||' to ' ||lower(column_name)||';' as alt_col
FROM information_schema.columns ma where ma.table_schema='ods' and column_name<> lower(column_name)
        )loop

        RAISE INFO '%: %', clock_timestamp(), v_rec.alt_col;
execute v_rec.alt_col;
END loop;

EXCEPTION
    WHEN OTHERS THEN
        RAISE EXCEPTION '(%:%:%)',clock_timestamp(), sqlerrm;
END;
$BODY$
  LANGUAGE plpgsql VOLATILE
  COST 100