Dayue Gao created HIVE-10792: -------------------------------- Summary: PPD leads to wrong answer when mapper scans the same table with multiple aliases Key: HIVE-10792 URL: https://issues.apache.org/jira/browse/HIVE-10792 Project: Hive Issue Type: Bug Components: File Formats, Query Processor Affects Versions: 1.2.0, 1.0.0, 0.13.1, 0.14.0, 0.13.0, 1.1.0 Reporter: Dayue Gao Assignee: Dayue Gao Priority: Critical
Here's the steps to reproduce the bug. First of all, prepare a simple ORC table with one row {code} create table test_orc (c0 int, c1 int) stored as ORC; {code} Table: test_orc ||c0||c1|| |0|1| The following SQL gets empty result which is not expected {code} select * from test_orc t1 union all select * from test_orc t2 where t2.c0 = 1 {code} Self join is also broken {code} set hive.auto.convert.join=false; -- force common join select * from test_orc t1 left outer join test_orc t2 on (t1.c0=t2.c0 and t2.c1=0); {code} It gets empty result while the expected answer is ||t1.c0||t1.c1||t2.c0||t2.c1|| |0|1|NULL|NULL| In these cases, we pushdown predicates into OrcInputFormat. As a result, TableScanOperator for "t1" can't receive its rows. -- This message was sent by Atlassian JIRA (v6.3.4#6332)