peng bo created SPARK-27539:
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Summary: Inaccurate aggregate outputRows estimation with null
value column
Key: SPARK-27539
URL: https://issues.apache.org/jira/browse/SPARK-27539
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 3.0.0
Reporter: peng bo
This issue is follow up of [https://github.com/apache/spark/pull/24286]. As
[~smilegator] pointed out that column with null value is inaccurate as well.
{code:java}
> select * from test;
2
NULL
1
spark-sql> desc extended test key;
col_name key
data_type int
comment NULL
min 1
max 2
num_nulls 1
distinct_count 2{code}
The distinct count should be distinct_count + 1 when the column contains null
value.
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