[impala] branch branch-4.0.0 updated: IMPALA-10696: fix accuracy problem

[jb...@apache.org]

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jbapple pushed a commit to branch branch-4.0.0
in repository https://gitbox.apache.org/repos/asf/impala.git


The following commit(s) were added to refs/heads/branch-4.0.0 by this push:
     new bc94f3a  IMPALA-10696: fix accuracy problem
bc94f3a is described below

commit bc94f3ad57837ee31e7bde528d1edad944d56940
Author: liuyao <54...@163.com>
AuthorDate: Sat May 8 11:23:53 2021 +0800

    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 <im...@cloudera.com>
    Reviewed-by: Jim Apple <jb...@apache.org>
---
 .../functional-query/queries/QueryTest/stats-extrapolation.test         | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/testdata/workloads/functional-query/queries/QueryTest/stats-extrapolation.test b/testdata/workloads/functional-query/queries/QueryTest/stats-extrapolation.test
index 1e05208..fc540a5 100644
--- a/testdata/workloads/functional-query/queries/QueryTest/stats-extrapolation.test
+++ b/testdata/workloads/functional-query/queries/QueryTest/stats-extrapolation.test
@@ -218,7 +218,7 @@ explain select id from alltypes;
 ---- RESULTS: VERIFY_IS_SUBSET
 '   stored statistics:'
 '     table: rows=unavailable size=unavailable'
-'     partitions: 0/24 rows=17.91K'
+row_regex:.* partitions: 0/24 rows=17\.9.*K
 '     columns: unavailable'
 row_regex:.* extrapolated-rows=unavailable.*
 row_regex:.* tuple-ids=0 row-size=4B cardinality=17\.9.*K