在使用impala建kudu表时，如果使用了impala的保留关键字，在查询时，需要对关键字字段加上``符号，所以尽量不要使用的关键字。
例如：
select timestamp from kudu_test; //会报错
select `timestamp` from kudu_test; //正常
impala 保留关键字: impala.apache.org/docs/build3…
hive 保留关键字列表: cwiki.apache.org/confluence/…
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