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https://issues.apache.org/jira/browse/DRILL-4735?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jinfeng Ni updated DRILL-4735:
------------------------------
    Labels: ready-to-commit  (was: )

> 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: 1.0.0, 1.4.0, 1.6.0, 1.7.0
>            Reporter: Krystal
>            Assignee: Arina Ielchiieva
>            Priority: Critical
>              Labels: ready-to-commit
>
> 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.



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