Linhong Liu created SPARK-34199:
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Summary: Block `count(table.*)` to follow ANSI standard and other
SQL engines
Key: SPARK-34199
URL: https://issues.apache.org/jira/browse/SPARK-34199
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 3.2.0
Reporter: Linhong Liu
In spark, the count(table.*) may cause very weird result, for example:
select count(*) from (select 1 as a, null as b) t;
output: 1
select count(t.*) from (select 1 as a, null as b) t;
output: 0
After checking the ANSI standard, count(*) is always treated as count(1) while
count(t.*) is not allowed. What's more, this is also not allowed by common
databases, e.g. MySQL, oracle.
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