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Posted to issues@drill.apache.org by "Victoria Markman (JIRA)" <ji...@apache.org> on 2015/01/10 02:31:35 UTC
[jira] [Created] (DRILL-1977) Wrong result with aggregation on top
of UNION ALL operator
Victoria Markman created DRILL-1977:
---------------------------------------
Summary: Wrong result with aggregation on top of UNION ALL operator
Key: DRILL-1977
URL: https://issues.apache.org/jira/browse/DRILL-1977
Project: Apache Drill
Issue Type: Bug
Components: Query Planning & Optimization
Affects Versions: 0.8.0
Reporter: Victoria Markman
Assignee: Jinfeng Ni
{code}
Jan 10 01:17:13 root@~ ] # hadoop fs -cat /test/t.json
{ "a1": 0, "b1": 0, "c1": "true", "d1" : "2015-01-02"}
{ "a1": 0, "b1": 0, "c1": "false" , "d1" : "2015-01-03"}
{ "a1": 0, "b1": 0, "c1": "false" , "d1" : "2015-01-04"}
{ "a1": 1, "b1": 1, "c1": "true" , "d1" : "2015-01-05"}
{ "a1": 1, "b1": 1, "c1": "true" , "d1" : "2015-01-06"}
{code}
Query below returns wrong result, we should have 4 groups, instead we get only two groups from right side of the union.
Notice lack of project step above union all (unclear if it has anything to to with the bug)
{code}
0: jdbc:drill:schema=dfs> select calc1, max(a1), min(b1), count(c1) from (select a1+10 as calc1, a1, b1, c1 from `t.json` union all select a1+100 as calc1, a1, b1, c1 from `t.json`) group by calc1;
+------------+------------+------------+------------+
| calc1 | EXPR$1 | EXPR$2 | EXPR$3 |
+------------+------------+------------+------------+
| 100 | 0 | 0 | 3 |
| 101 | 1 | 1 | 2 |
+------------+------------+------------+------------+
2 rows selected (0.181 seconds)
00-01 Project(calc1=[$0], EXPR$1=[$1], EXPR$2=[$2], EXPR$3=[$3])
00-02 HashAgg(group=[{0}], EXPR$1=[MAX($1)], EXPR$2=[MIN($2)], EXPR$3=[COUNT($3)])
00-03 UnionAll(all=[true])
00-05 Project(calc1=[+($2, 10)], a1=[$2], b1=[$1], c1=[$0])
00-07 Scan(groupscan=[EasyGroupScan [selectionRoot=/test/t.json, numFiles=1, columns=[`a1`, `b1`, `c1`], files=[maprfs:/test/t.json]]])
00-04 Project(calc1=[+($2, 100)], a1=[$2], b1=[$1], c1=[$0])
00-06 Scan(groupscan=[EasyGroupScan [selectionRoot=/test/t.json, numFiles=1, columns=[`a1`, `b1`, `c1`], files=[maprfs:/test/t.json]]])
{code}
Correct result, when order of the columns is different in aggregate functions: "min(b1), max(a1)" instead of "max(a1), min(b1)"
{code}
0: jdbc:drill:schema=dfs> select calc1, min(b1), max(a1), count(c1) from (select a1+10 as calc1, a1, b1, c1 from `t.json` union all select a1+100 as calc1, a1, b1, c1 from `t.json`) group by calc1;
+------------+------------+------------+------------+
| calc1 | EXPR$1 | EXPR$2 | EXPR$3 |
+------------+------------+------------+------------+
| 10 | 0 | 0 | 3 |
| 11 | 1 | 1 | 2 |
| 100 | 0 | 0 | 3 |
| 101 | 1 | 1 | 2 |
+------------+------------+------------+------------+
4 rows selected (0.256 seconds)
00-01 Project(calc1=[$0], EXPR$1=[$1], EXPR$2=[$2], EXPR$3=[$3])
00-02 HashAgg(group=[{0}], EXPR$1=[MIN($1)], EXPR$2=[MAX($2)], EXPR$3=[COUNT($3)])
00-03 Project(calc1=[$0], b1=[$2], a1=[$1], c1=[$3])
00-04 UnionAll(all=[true])
00-06 Project(calc1=[+($2, 10)], a1=[$2], b1=[$1], c1=[$0])
00-08 Scan(groupscan=[EasyGroupScan [selectionRoot=/test/t.json, numFiles=1, columns=[`a1`, `b1`, `c1`], files=[maprfs:/test/t.json]]])
00-05 Project(calc1=[+($2, 100)], a1=[$2], b1=[$1], c1=[$0])
00-07 Scan(groupscan=[EasyGroupScan [selectionRoot=/test/t.json, numFiles=1, columns=[`a1`, `b1`, `c1`], files=[maprfs:/test/t.json]]]){code}
Non-union query works correctly:
{code}
0: jdbc:drill:schema=dfs> select a1+10 as calc1, min(a1), max(b1), count(c1) from `t.json` group by a1+10;
+------------+------------+------------+------------+
| calc1 | EXPR$1 | EXPR$2 | EXPR$3 |
+------------+------------+------------+------------+
| 10 | 0 | 0 | 3 |
| 11 | 1 | 1 | 2 |
+------------+------------+------------+------------+
2 rows selected (0.142 seconds)
0: jdbc:drill:schema=dfs> select a1+10 as calc1, min(b1), max(a1), count(c1) from `t.json` group by a1+10;
+------------+------------+------------+------------+
| calc1 | EXPR$1 | EXPR$2 | EXPR$3 |
+------------+------------+------------+------------+
| 10 | 0 | 0 | 3 |
| 11 | 1 | 1 | 2 |
+------------+------------+------------+------------+
2 rows selected (0.153 seconds)
{code}
If I switch legs of a UNION, we still get wrong result, but from the right side:
{code}
0: jdbc:drill:schema=dfs> select calc1, max(a1), min(b1), count(c1) from (select a1+100 as calc1, a1, b1, c1 from `t.json` union all select a1+10 as calc1, a1, b1, c1 from `t.json`) group by calc1;
+------------+------------+------------+------------+
| calc1 | EXPR$1 | EXPR$2 | EXPR$3 |
+------------+------------+------------+------------+
| 10 | 0 | 0 | 3 |
| 11 | 1 | 1 | 2 |
+------------+------------+------------+------------+
2 rows selected (0.19 seconds)
{code}
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