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Posted to dev@drill.apache.org by "Chun Chang (JIRA)" <ji...@apache.org> on 2015/02/25 03:48:05 UTC
[jira] [Created] (DRILL-2309) 'null' is counted with subquery
Chun Chang created DRILL-2309:
---------------------------------
Summary: 'null' is counted with subquery
Key: DRILL-2309
URL: https://issues.apache.org/jira/browse/DRILL-2309
Project: Apache Drill
Issue Type: Bug
Components: Execution - Data Types
Affects Versions: 0.8.0
Reporter: Chun Chang
Assignee: Daniel Barclay (Drill)
Priority: Critical
#Thu Feb 19 18:40:10 EST 2015
git.commit.id.abbrev=1ceddff
The following query returns correct count involving columns that contains null value.
{code}
0: jdbc:drill:schema=dfs.drillTestDirComplexJ> select tt.gbyi, count(tt.nul) from (select t.id, t.gbyi, t.fl, t.nul from `complex.json` t) tt group by tt.gbyi order by tt.gbyi;
+------------+------------+
| gbyi | EXPR$1 |
+------------+------------+
| 0 | 33580 |
| 1 | 33317 |
| 2 | 33438 |
| 3 | 33535 |
| 4 | 33369 |
| 5 | 32990 |
| 6 | 33661 |
| 7 | 33130 |
| 8 | 33362 |
| 9 | 33364 |
| 10 | 33229 |
| 11 | 33567 |
| 12 | 33379 |
| 13 | 33045 |
| 14 | 33305 |
+------------+------------+
{code}
But if you add more aggregation to the query, the returned count is wrong (pay attention to the last column).
{code}
0: jdbc:drill:schema=dfs.drillTestDirComplexJ> select tt.gbyi, sum(tt.id), avg(tt.fl), count(tt.nul) from (select t.id, t.gbyi, t.fl, t.nul from `complex.json` t) tt group by tt.gbyi order by tt.gbyi;
+------------+------------+------------+------------+
| gbyi | EXPR$1 | EXPR$2 | EXPR$3 |
+------------+------------+------------+------------+
| 0 | 33445554017 | 499613.0956877819 | 66943 |
| 1 | 33209358334 | 500760.0252919893 | 66318 |
| 2 | 33369118041 | 498091.82200273 | 66994 |
| 3 | 33254533860 | 498696.5063226428 | 66683 |
| 4 | 33393965595 | 501125.64656145993 | 66638 |
| 5 | 33216885506 | 499961.32710397616 | 66439 |
| 6 | 33380205950 | 498875.3923256599 | 66911 |
| 7 | 33405849390 | 501093.43067788356 | 66666 |
| 8 | 33136951190 | 498458.1044031481 | 66479 |
| 9 | 33319291474 | 499967.5392457864 | 66643 |
| 10 | 33339388887 | 499190.47462408233 | 66787 |
| 11 | 33571590550 | 502095.86682194035 | 66863 |
| 12 | 33437342090 | 501708.8141502653 | 66647 |
| 13 | 33071800925 | 498896.453904129 | 66290 |
| 14 | 33448664191 | 501487.4206955959 | 66699 |
+------------+------------+------------+------------+
[code}
plan for the query returned the wrong result:
{code}
0: jdbc:drill:schema=dfs.drillTestDirComplexJ> explain plan for select tt.gbyi, sum(tt.id), avg(tt.fl), count(tt.nul) from (select t.id, t.gbyi, t.fl, t.nul from `complex.json` t) tt group by tt.gbyi order by tt.gbyi;
+------------+------------+
| text | json |
+------------+------------+
| 00-00 Screen
00-01 Project(gbyi=[$0], EXPR$1=[$1], EXPR$2=[$2], EXPR$3=[$3])
00-02 SingleMergeExchange(sort0=[0 ASC])
01-01 SelectionVectorRemover
01-02 Sort(sort0=[$0], dir0=[ASC])
01-03 Project(gbyi=[$0], EXPR$1=[CASE(=($2, 0), null, $1)], EXPR$2=[CAST(/(CastHigh(CASE(=($4, 0), null, $3)), $4)):ANY], EXPR$3=[$5])
01-04 HashAgg(group=[{0}], agg#0=[$SUM0($1)], agg#1=[$SUM0($2)], agg#2=[$SUM0($3)], agg#3=[$SUM0($4)], EXPR$3=[$SUM0($5)])
01-05 HashToRandomExchange(dist0=[[$0]])
02-01 HashAgg(group=[{0}], agg#0=[$SUM0($1)], agg#1=[COUNT($1)], agg#2=[$SUM0($2)], agg#3=[COUNT($2)], EXPR$3=[COUNT()])
02-02 Project(gbyi=[$3], id=[$2], fl=[$1], nul=[$0])
02-03 Scan(groupscan=[EasyGroupScan [selectionRoot=/drill/testdata/complex_type/json/complex.json, numFiles=1, columns=[`gbyi`, `id`, `fl`, `nul`], files=[maprfs:/drill/testdata/complex_type/json/complex.json]]])
{code}
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