Caizhi Weng created FLINK-25311:
-----------------------------------
Summary: DelimitedInputFormat cannot read compressed files
correctly
Key: FLINK-25311
URL: https://issues.apache.org/jira/browse/FLINK-25311
Project: Flink
Issue Type: Bug
Components: API / Core
Affects Versions: 1.14.2
Reporter: Caizhi Weng
This is reported in the [user mailing
list|https://lists.apache.org/thread/y854gjxyomtypcs8x4f88pttnl9k0j9q]
Run the following test to reproduce this bug.
{code:java}
import org.apache.flink.table.api.EnvironmentSettings;
import org.apache.flink.table.api.TableEnvironment;
import org.apache.flink.table.api.internal.TableEnvironmentImpl;
import org.junit.Test;
public class MyTest {
@Test
public void myTest() throws Exception {
EnvironmentSettings settings = EnvironmentSettings.inBatchMode();
TableEnvironment tEnv = TableEnvironmentImpl.create(settings);
tEnv.executeSql(
"create table T1 ( a INT ) with ( 'connector' =
'filesystem', 'format' = 'json', 'path' = '/tmp/gao.json' )")
.await();
tEnv.executeSql(
"create table T2 ( a INT ) with ( 'connector' =
'filesystem', 'format' = 'json', 'path' = '/tmp/gao.gz' )")
.await();
tEnv.executeSql("select count(*) from T1 UNION ALL select count(*) from
T2").print();
}
}
{code}
Data files used are attached in the attachment.
The result is
{code}
+----------------------+
| EXPR$0 |
+----------------------+
| 100 |
| 24 |
+----------------------+
{code}
which is obviously incorrect.
This is because {{DelimitedInputFormat#fillBuffer}} cannot deal with compressed
files correctly. It limits the number of (uncompressed) bytes read with
{{splitLength}}, while {{splitLength}} is the length of compressed bytes, so
they cannot match.
--
This message was sent by Atlassian Jira
(v8.20.1#820001)
