odbtools/odbctest/mql/test/m3event/9.test.mql

alter class /m3event/entity/node drop column component
-- { onerror(continue) }
;


SELECT
  *
FROM
  /m3event/entity/node
limit 1
/**
output()
**/
;

alter class /m3event/entity/node add column component component[1..1] '组件'
;

-- alter class /test/malert_status add column v_test int
;

-- SELECT
--   identifier, agent, node, v_varchar, connect
-- FROM
--   /test/malert_status 
/**
output()
**/
;

SELECT
  *
FROM
  /m3event/entity/node
limit 1
/**
output()
**/
;