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Posted to issues@drill.apache.org by "Vitalii Diravka (JIRA)" <ji...@apache.org> on 2017/11/15 17:42:00 UTC
[jira] [Created] (DRILL-5970) DrillParquetReader always builds the
schema with "OPTIONAL" dataMode columns instead of "REQUIRED" ones
Vitalii Diravka created DRILL-5970:
--------------------------------------
Summary: DrillParquetReader always builds the schema with "OPTIONAL" dataMode columns instead of "REQUIRED" ones
Key: DRILL-5970
URL: https://issues.apache.org/jira/browse/DRILL-5970
Project: Apache Drill
Issue Type: Bug
Components: Execution - Codegen, Execution - Data Types, Storage - Parquet
Affects Versions: 1.11.0
Reporter: Vitalii Diravka
Assignee: Vitalii Diravka
The root cause of the issue is that adding REQUIRED (not-nullable) data types to the container in the all MapWriters is not implemented.
It can lead to get invalid schema.
{code}
0: jdbc:drill:zk=local> CREATE TABLE dfs.tmp.bof_repro_1 as select * from (select CONVERT_FROM('["hello","hai"]','JSON') AS MYCOL, 'Bucket1' AS Bucket FROM (VALUES(1)));
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
+-----------+----------------------------+
| Fragment | Number of records written |
+-----------+----------------------------+
| 0_0 | 1 |
+-----------+----------------------------+
1 row selected (2.376 seconds)
{code}
Run from Drill unit test framework (to see "data mode"):
{code}
@Test
public void test() throws Exception {
setColumnWidths(new int[] {25, 25});
List<QueryDataBatch> queryDataBatches = testSqlWithResults("select * from dfs.tmp.bof_repro_1");
printResult(queryDataBatches);
}
1 row(s):
-------------------------------------------------------
| MYCOL<VARCHAR(REPEATED)> | Bucket<VARCHAR(OPTIONAL)>|
-------------------------------------------------------
| ["hello","hai"] | Bucket1 |
-------------------------------------------------------
Total record count: 1
{code}
{code}
vitalii@vitalii-pc:~/parquet-tools/parquet-mr/parquet-tools/target$ java -jar parquet-tools-1.6.0rc3-SNAPSHOT.jar schema /tmp/bof_repro_1/0_0_0.parquet
message root {
repeated binary MYCOL (UTF8);
required binary Bucket (UTF8);
}
{code}
To simulate of obtaining the wrong result you can try the query with aggregation by using a new parquet reader (used by default for complex data types) and old parquet reader. False "Hash aggregate does not support schema changes" error will happen.
1) Create two parquet files.
{code}
0: jdbc:drill:schema=dfs> CREATE TABLE dfs.tmp.bof_repro_1 as select * from (select CONVERT_FROM('["hello","hai"]','JSON') AS MYCOL, 'Bucket1' AS Bucket FROM (VALUES(1)));
+-----------+----------------------------+
| Fragment | Number of records written |
+-----------+----------------------------+
| 0_0 | 1 |
+-----------+----------------------------+
1 row selected (1.122 seconds)
0: jdbc:drill:schema=dfs> CREATE TABLE dfs.tmp.bof_repro_2 as select * from (select CONVERT_FROM('[]','JSON') AS MYCOL, 'Bucket1' AS Bucket FROM (VALUES(1)));
+-----------+----------------------------+
| Fragment | Number of records written |
+-----------+----------------------------+
| 0_0 | 1 |
+-----------+----------------------------+
1 row selected (0.552 seconds)
0: jdbc:drill:schema=dfs> select * from dfs.tmp.bof_repro_2;
{code}
2) Copy the parquet files from bof_repro_1 to bof_repro_2.
{code}
[root@naravm1 ~]# hadoop fs -ls /tmp/bof_repro_1
Found 1 items
-rw-r--r-- 3 mapr mapr 415 2017-07-25 11:46 /tmp/bof_repro_1/0_0_0.parquet
[root@naravm1 ~]# hadoop fs -ls /tmp/bof_repro_2
Found 1 items
-rw-r--r-- 3 mapr mapr 368 2017-07-25 11:46 /tmp/bof_repro_2/0_0_0.parquet
[root@naravm1 ~]# hadoop fs -cp /tmp/bof_repro_1/0_0_0.parquet /tmp/bof_repro_2/0_0_1.parquet
[root@naravm1 ~]#
{code}
3) Query the table.
{code}
0: jdbc:drill:schema=dfs> ALTER SESSION SET `planner.enable_streamagg`=false;
+-------+------------------------------------+
| ok | summary |
+-------+------------------------------------+
| true | planner.enable_streamagg updated. |
+-------+------------------------------------+
1 row selected (0.124 seconds)
0: jdbc:drill:schema=dfs> select * from dfs.tmp.bof_repro_2;
+------------------+----------+
| MYCOL | Bucket |
+------------------+----------+
| ["hello","hai"] | Bucket1 |
| null | Bucket1 |
+------------------+----------+
2 rows selected (0.247 seconds)
0: jdbc:drill:schema=dfs> select bucket, count(*) from dfs.tmp.bof_repro_2 group by bucket;
Error: UNSUPPORTED_OPERATION ERROR: Hash aggregate does not support schema changes
Fragment 0:0
[Error Id: 60f8ada3-5f00-4413-a676-4881fc8cb409 on naravm3:31010] (state=,code=0)
{code}
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