Deneche A. Hakim created DRILL-4376:
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Summary: Wrong results when doing a count(*) on part of
directories with metadata cache
Key: DRILL-4376
URL: https://issues.apache.org/jira/browse/DRILL-4376
Project: Apache Drill
Issue Type: Bug
Components: Metadata
Affects Versions: 1.4.0
Reporter: Deneche A. Hakim
Assignee: Deneche A. Hakim
Priority: Critical
Fix For: 1.6.0
First create some parquet tables in multiple subfolders:
{noformat}
create table dfs.tmp.`test/201501` as select employee_id, full_name from
cp.`employee.json` limit 2;
create table dfs.tmp.`test/201502` as select employee_id, full_name from
cp.`employee.json` limit 2;
create table dfs.tmp.`test/201601` as select employee_id, full_name from
cp.`employee.json` limit 2;
create table dfs.tmp.`test/201602` as select employee_id, full_name from
cp.`employee.json` limit 2;
{noformat}
Running the following query gives the expected count:
{noformat}
select count(*) from dfs.tmp.`test/20160*`;
+---------+
| EXPR$0 |
+---------+
| 4 |
+---------+
{noformat}
But once you create the metadata cache files, the query no longer returns the
correct results:
{noformat}
refresh table metadata dfs.tmp.`test`;
select count(*) from dfs.tmp.`test/20160*`;
+---------+
| EXPR$0 |
+---------+
| 2 |
+---------+
{noformat}
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