[fix](hdfs) Fix hdfsExists that return staled root cause #27991
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The HDFS native client won't clear the last exception as expected so `hdfsGetLastExceptionRootCause` might return a staled root cause. This PR saves the last root cause here and verifies after hdfsExists returns a non-zero code.
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Proposed changes
Issue Number: close #xxx
The HDFS native client won't clear the last exception as expected so
hdfsGetLastExceptionRootCausemight return a staled root cause. This PR saves the last root cause here and verifies after hdfsExists returns a non-zero code.Further comments
If this is a relatively large or complex change, kick off the discussion at dev@doris.apache.org by explaining why you chose the solution you did and what alternatives you considered, etc...