GAUSS-01451：function %d(%s,%s) already exists in operator family '%s' SQLSTATE: 42710
错误码
错误描述：function %d(%s,%s) already exists in operator family '%s' SQLSTATE: 42710
错误原因：CREATE OPERATOR CLASS、ALTER OPERATOR FAMILY … ADD/DROP function，已经存在了相同的function。
解决方法：CREATE OPERATOR CLASS、ALTER OPERATOR FAMILY … ADD/DROP function之前，确保添加的function在指定的operator family中尚未存在。
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