Chun Chang created DRILL-1988:
---------------------------------
Summary: join returned maps are all empty
Key: DRILL-1988
URL: https://issues.apache.org/jira/browse/DRILL-1988
Project: Apache Drill
Issue Type: Bug
Components: Execution - Flow
Affects Versions: 0.8.0
Reporter: Chun Chang
Assignee: Chris Westin
#Fri Jan 09 20:39:31 EST 2015
git.commit.id.abbrev=487d98e
For complex json type, a join query returned all maps with empty value. The
actual data has empty maps for some rows, but mostly with value. Data can be
downloaded from:
https://s3.amazonaws.com/apache-drill/files/complex.json.gz
{code}
0: jdbc:drill:schema=dfs.drillTestDirComplexJ> select a.id, a.soa[3].str,
b.soa[3].str, a.ooa[1].fl from `complex.json` a inner join `complex.json` b on
a.soa[3].str=b.soa[3].str order by a.id limit 10;
+------------+------------+------------+------------+
| id | EXPR$1 | EXPR$2 | EXPR$3 |
+------------+------------+------------+------------+
| 1 | here is a string at row 1 | here is a string at row 1 | {}
|
| 2 | here is a string at row 2 | here is a string at row 2 | {}
|
| 3 | here is a string at row 3 | here is a string at row 3 | {}
|
| 4 | here is a string at row 4 | here is a string at row 4 | {}
|
| 5 | here is a string at row 5 | here is a string at row 5 | {}
|
| 6 | here is a string at row 6 | here is a string at row 6 | {}
|
| 7 | here is a string at row 7 | here is a string at row 7 | {}
|
| 8 | here is a string at row 8 | here is a string at row 8 | {}
|
| 9 | here is a string at row 9 | here is a string at row 9 | {}
|
| 10 | here is a string at row 10 | here is a string at row 10 | {}
|
+------------+------------+------------+------------+
{code}
As you can see from the following query, maps is not empty for most of the row
IDs.
{code}
0: jdbc:drill:schema=dfs.drillTestDirComplexJ> select a.id, a.ooa[1].fl from
`complex.json` a limit 10;
+------------+------------+
| id | EXPR$1 |
+------------+------------+
| 1 | {"f1":1.6789,"f2":54331.0} |
| 2 | {} |
| 3 | {"f1":3.6789,"f2":54351.0} |
| 4 | {"f1":4.6789,"f2":54361.0} |
| 5 | {"f1":5.6789,"f2":54371.0} |
| 6 | {} |
| 7 | {"f1":7.6789,"f2":54391.0} |
| 8 | {} |
| 9 | {"f1":9.6789,"f2":54411.0} |
| 10 | {"f1":10.6789,"f2":54421.0} |
+------------+------------+
{code}
physical plan:
{code}
0: jdbc:drill:schema=dfs.drillTestDirComplexJ> explain plan for select a.id,
a.soa[3].str, b.soa[3].str, a.ooa[1].fl from `complex.json` a inner join
`complex.json` b on a.soa[3].str=b.soa[3].str order by a.id limit 10;
+------------+------------+
| text | json |
+------------+------------+
| 00-00 Screen
00-01 Project(id=[$0], EXPR$1=[$1], EXPR$2=[$2], EXPR$3=[$3])
00-02 SelectionVectorRemover
00-03 Limit(fetch=[10])
00-04 SingleMergeExchange(sort0=[0 ASC])
01-01 SelectionVectorRemover
01-02 TopN(limit=[10])
01-03 HashToRandomExchange(dist0=[[$0]])
02-01 Project(id=[$0], EXPR$1=[$2], EXPR$2=[$5], EXPR$3=[$3])
02-02 HashJoin(condition=[=($1, $4)], joinType=[inner])
02-04 HashToRandomExchange(dist0=[[$1]])
03-01 Project(id=[$2], $f4=[ITEM(ITEM($1, 3), 'str')],
ITEM=[ITEM(ITEM($1, 3), 'str')], ITEM3=[ITEM(ITEM($0, 1), 'fl')])
03-02 Scan(groupscan=[EasyGroupScan
[selectionRoot=/drill/testdata/complex_type/json/complex.json, numFiles=1,
columns=[`id`, `soa`[3].`str`, `ooa`[1].`fl`],
files=[maprfs:/drill/testdata/complex_type/json/complex.json]]])
02-03 Project($f40=[$0], ITEM0=[$1])
02-05 HashToRandomExchange(dist0=[[$0]])
04-01 Project($f4=[ITEM(ITEM($0, 3), 'str')],
ITEM=[ITEM(ITEM($0, 3), 'str')])
04-02 Scan(groupscan=[EasyGroupScan
[selectionRoot=/drill/testdata/complex_type/json/complex.json, numFiles=1,
columns=[`soa`[3].`str`],
files=[maprfs:/drill/testdata/complex_type/json/complex.json]]])
{code}
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