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https://issues.apache.org/jira/browse/DRILL-5691?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16118148#comment-16118148
]
ASF GitHub Bot commented on DRILL-5691:
---------------------------------------
Github user arina-ielchiieva commented on the issue:
https://github.com/apache/drill/pull/889
@weijietong regarding the unit test, I have tried to reproduce the problem
and written the following unit test:
```
@Test
public void test() throws Exception {
FileSystem fs = null;
try {
fs = FileSystem.get(new Configuration());
// create table with partition pruning
test("use dfs_test.tmp");
String tableName = "table_with_pruning";
Path dataFile = new
Path(TestTools.getWorkingPath(),"src/test/resources/parquet/alltypes_required.parquet");
test("create table %s partition by (col_int) as select * from
dfs.`%s`", tableName, dataFile);
// generate metadata
test("refresh table metadata `%s`", tableName);
// execute query
String query = String.format("select count(distinct col_int),
count(distinct col_chr) from `%s` where col_int = 45436", tableName);
test(query);
} finally {
if (fs != null) {
fs.close();
}
}
}
```
`AbstractGroupScan.getScanStats` method returns one row but it does not
fail. Can you please take a look?
> multiple count distinct query planning error at physical phase
> ---------------------------------------------------------------
>
> Key: DRILL-5691
> URL: https://issues.apache.org/jira/browse/DRILL-5691
> Project: Apache Drill
> Issue Type: Bug
> Components: Execution - Relational Operators
> Affects Versions: 1.9.0, 1.10.0
> Reporter: weijie.tong
>
> I materialized the count distinct query result in a cache , added a plugin
> rule to translate the (Aggregate、Aggregate、Project、Scan) or
> (Aggregate、Aggregate、Scan) to (Project、Scan) at the PARTITION_PRUNING phase.
> Then ,once user issue count distinct queries , it will be translated to query
> the cache to get the result.
> eg1: " select count(*),sum(a) ,count(distinct b) from t where dt=xx "
> eg2:"select count(*),sum(a) ,count(distinct b) ,count(distinct c) from t
> where dt=xxx "
> eg3:"select count(distinct b), count(distinct c) from t where dt=xxx"
> eg1 will be right and have a query result as I expected , but eg2 will be
> wrong at the physical phase.The error info is here:
> https://gist.github.com/weijietong/1b8ed12db9490bf006e8b3fe0ee52269.
> eg3 will also get the similar error.
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