Quanlong Huang created IMPALA-11444:
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Summary: Wrong results in reading wide rows from ORC
Key: IMPALA-11444
URL: https://issues.apache.org/jira/browse/IMPALA-11444
Project: IMPALA
Issue Type: Bug
Components: Backend
Affects Versions: Impala 3.4.1, Impala 3.4.0
Reporter: Quanlong Huang
Assignee: Quanlong Huang
The bug only exists in 3.4 branches where we have IMPALA-9228 and is missing
IMPALA-9469.
When reading from a wide table with tuple size larger than , the orc scanner
produces wrong results. The issue can be reproduced using the attached
CreateTable stmt and the ORC file.
{code:sql}
$ bin/impala-shell.sh --quiet -f create-table-512cols.sql
$ bin/impala-shell.sh -B --quiet -q 'show table stats orc_tbl_512cols'
-1 0 0B NOT CACHED NOT CACHED ORC false
hdfs://localhost:20500/test-warehouse/orc_tbl_512cols
$ hdfs dfs -put widerow_512cols.orc
hdfs://localhost:20500/test-warehouse/orc_tbl_512cols
$ bin/impala-shell.sh -q 'refresh orc_tbl_512cols'
{code}
Then run the following query:
{code:sql}
$ bin/impala-shell.sh -B -q "select * from orc_tbl_512cols where col0 = '1'"
{code}
The result should be only one row with all values as '1'. However, we get one
rwo with all values as '1024'.
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