You are viewing a plain text version of this content. The canonical link for it is here.
Posted to issues@drill.apache.org by "Krystal (JIRA)" <ji...@apache.org> on 2016/06/21 16:03:58 UTC
[jira] [Created] (DRILL-4735) Count(dir0) on parquet returns 0
result
Krystal created DRILL-4735:
------------------------------
Summary: Count(dir0) on parquet returns 0 result
Key: DRILL-4735
URL: https://issues.apache.org/jira/browse/DRILL-4735
Project: Apache Drill
Issue Type: Bug
Components: Query Planning & Optimization, Storage - Parquet
Affects Versions: 1.6.0, 1.7.0
Reporter: Krystal
Selecting a count of dir0, dir1, etc against a parquet directory returns 0 rows.
select count(dir0) from `min_max_dir`;
+---------+
| EXPR$0 |
+---------+
| 0 |
+---------+
select count(dir1) from `min_max_dir`;
+---------+
| EXPR$0 |
+---------+
| 0 |
+---------+
If I put both dir0 and dir1 in the same select, it returns expected result:
select count(dir0), count(dir1) from `min_max_dir`;
+---------+---------+
| EXPR$0 | EXPR$1 |
+---------+---------+
| 600 | 600 |
+---------+---------+
Here is the physical plan for count(dir0) query:
{code}
00-00 Screen : rowType = RecordType(BIGINT EXPR$0): rowcount = 20.0, cumulative cost = {22.0 rows, 22.0 cpu, 0.0 io, 0.0 network, 0.0 memory}, id = 1346
00-01 Project(EXPR$0=[$0]) : rowType = RecordType(BIGINT EXPR$0): rowcount = 20.0, cumulative cost = {20.0 rows, 20.0 cpu, 0.0 io, 0.0 network, 0.0 memory}, id = 1345
00-02 Project(EXPR$0=[$0]) : rowType = RecordType(BIGINT EXPR$0): rowcount = 20.0, cumulative cost = {20.0 rows, 20.0 cpu, 0.0 io, 0.0 network, 0.0 memory}, id = 1344
00-03 Scan(groupscan=[org.apache.drill.exec.store.pojo.PojoRecordReader@3da85d3b[columns = null, isStarQuery = false, isSkipQuery = false]]) : rowType = RecordType(BIGINT count): rowcount = 20.0, cumulative cost = {20.0 rows, 20.0 cpu, 0.0 io, 0.0 network, 0.0 memory}, id = 1343
{code}
Here is part of the explain plan for the count(dir0) and count(dir1) in the same select:
{code}
00-00 Screen : rowType = RecordType(BIGINT EXPR$0, BIGINT EXPR$1): rowcount = 60.0, cumulative cost = {1206.0 rows, 15606.0 cpu, 0.0 io, 0.0 network, 0.0 memory}, id = 1623
00-01 Project(EXPR$0=[$0], EXPR$1=[$1]) : rowType = RecordType(BIGINT EXPR$0, BIGINT EXPR$1): rowcount = 60.0, cumulative cost = {1200.0 rows, 15600.0 cpu, 0.0 io, 0.0 network, 0.0 memory}, id = 1622
00-02 StreamAgg(group=[{}], EXPR$0=[COUNT($0)], EXPR$1=[COUNT($1)]) : rowType = RecordType(BIGINT EXPR$0, BIGINT EXPR$1): rowcount = 60.0, cumulative cost = {1200.0 rows, 15600.0 cpu, 0.0 io, 0.0 network, 0.0 memory}, id = 1621
00-03 Scan(groupscan=[ParquetGroupScan [entries=[ReadEntryWithPath [path=maprfs:/drill/testdata/min_max_dir/1999/Apr/voter20.parquet/0_0_0.parquet], ReadEntryWithPath [path=maprfs:/drill/testdata/min_max_dir/1999/MAR/voter15.parquet/0_0_0.parquet], ReadEntryWithPath [path=maprfs:/drill/testdata/min_max_dir/1985/jan/voter5.parquet/0_0_0.parquet], ReadEntryWithPath [path=maprfs:/drill/testdata/min_max_dir/1985/apr/voter60.parquet/0_0_0.parquet],..., ReadEntryWithPath [path=maprfs:/drill/testdata/min_max_dir/2014/jul/voter35.parquet/0_0_0.parquet]], selectionRoot=maprfs:/drill/testdata/min_max_dir, numFiles=16, usedMetadataFile=false, columns=[`dir0`, `dir1`]]]) : rowType = RecordType(ANY dir0, ANY dir1): rowcount = 600.0, cumulative cost = {600.0 rows, 1200.0 cpu, 0.0 io, 0.0 network, 0.0 memory}, id = 1620
{code}
Notice that in the first case, "org.apache.drill.exec.store.pojo.PojoRecordReader" is used.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)