liuyao 9c38568657 IMPALA-10696: fix accuracy problem ...

Table alltypes has no statistics, so the cardinality of alltypes
will be estimated based on the hdfs files and the avg row size.
Calling PrintUtils.printMetric, double will be divided by long. There
will be accuracy problems. In most cases, the number of lines
calculated is 17.91 K. But due to accuracy problems here, the
calculated value is 17.90K.

I modified line 221 of stats-extrapolation.test and used row_regex
to match, referring to the matching method of cardinality in line
224,in this case, their values are the same

Testing:
metadata/test_stats_extrapolation.py

Change-Id: I0a1a3809508c90217517705b2b188b2ccba6f23f
Reviewed-on: http://gerrit.cloudera.org:8080/17411
Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
Reviewed-by: Jim Apple <jbapple@apache.org>

2021-05-15 22:20:58 +00:00

9.4 KiB

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