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https://issues.apache.org/jira/browse/DRILL-4720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16068623#comment-16068623
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Arina Ielchiieva commented on DRILL-4720:
-----------------------------------------
When {{mindir()}} or {{maxdir()}} functions applied, list of sub-partitions are
retrieved from
{{[PartitionExplorer|https://github.com/apache/drill/blob/master/exec/java-exec/src/main/codegen/templates/DirectoryExplorers.java#L71]}}
and then min / max is returned according to String natural order. This method
is supposed to return of only sub-folders in given directory but was returning
files as well.
Let's say initially we had table with the following structure:
{noformat}
../table
../table/1991
../table/1992
{noformat}
Running {{refresh table metadata ...}} creates metadata cache file in directory:
{noformat}
../table
../table/1991
../table/1992
../table/.drill.parquet_metadata
{noformat}
So before {{refresh table metadata ...}} {{PartitionExplorer.getSubPartitions}}
returned 1991 and 1992 and mindir function was choosing 1991 as min partition.
After {{refresh table metadata ...}} {{PartitionExplorer.getSubPartitions}}
returned 1991, 1992 and .drill.parquet_metadata and mindir function was
choosing .drill.parquet_metadata as min partition.
> MINDIR() and IMINDIR() functions return no results with metadata cache
> ----------------------------------------------------------------------
>
> Key: DRILL-4720
> URL: https://issues.apache.org/jira/browse/DRILL-4720
> Project: Apache Drill
> Issue Type: Bug
> Components: Functions - Drill
> Affects Versions: 1.7.0
> Reporter: Krystal
> Assignee: Arina Ielchiieva
>
> Parquet directories with meta data cache return 0 rows for MINDIR and IMINDIR
> functions.
> hadoop fs -ls /tmp/querylogs_4
> Found 6 items
> -rwxr-xr-x 3 mapr mapr 15406 2016-06-13 10:18
> /tmp/querylogs_4/.drill.parquet_metadata
> drwxr-xr-x - root root 4 2016-06-13 10:18 /tmp/querylogs_4/1985
> drwxr-xr-x - root root 3 2016-06-13 10:18 /tmp/querylogs_4/1999
> drwxr-xr-x - root root 3 2016-06-13 10:18 /tmp/querylogs_4/2005
> drwxr-xr-x - root root 4 2016-06-13 10:18 /tmp/querylogs_4/2014
> drwxr-xr-x - root root 6 2016-06-13 10:18 /tmp/querylogs_4/2016
> hadoop fs -ls /tmp/querylogs_4/1985
> Found 4 items
> -rwxr-xr-x 3 mapr mapr 3634 2016-06-13 10:18
> /tmp/querylogs_4/1985/.drill.parquet_metadata
> drwxr-xr-x - root root 2 2016-06-13 10:18 /tmp/querylogs_4/1985/Feb
> drwxr-xr-x - root root 2 2016-06-13 10:18 /tmp/querylogs_4/1985/apr
> drwxr-xr-x - root root 2 2016-06-13 10:18
> /tmp/querylogs_4/1985/jan
> SELECT * FROM `dfs.tmp`.`querylogs_4` WHERE dir0 =
> MINDIR('dfs.tmp','querylogs_4');
> +-----------+-------+------+---------------+----------------+------------+------------+-------+-------+-------+
> | voter_id | name | age | registration | contributions | voterzone |
> date_time | dir0 | dir1 | dir2 |
> +-----------+-------+------+---------------+----------------+------------+------------+-------+-------+-------+
> +-----------+-------+------+---------------+----------------+------------+------------+-------+-------+-------+
> No rows selected (0.803 seconds)
> If the meta cache is removed, expected data is returned.
> Here is the physical plan:
> {code}
> 00-00 Screen : rowType = RecordType(ANY *): rowcount = 3.75, cumulative
> cost = {54.125 rows, 169.125 cpu, 0.0 io, 0.0 network, 0.0 memory}, id =
> 664191
> 00-01 Project(*=[$0]) : rowType = RecordType(ANY *): rowcount = 3.75,
> cumulative cost = {53.75 rows, 168.75 cpu, 0.0 io, 0.0 network, 0.0 memory},
> id = 664190
> 00-02 Project(T51¦¦*=[$0]) : rowType = RecordType(ANY T51¦¦*):
> rowcount = 3.75, cumulative cost = {53.75 rows, 168.75 cpu, 0.0 io, 0.0
> network, 0.0 memory}, id = 664189
> 00-03 SelectionVectorRemover : rowType = RecordType(ANY T51¦¦*, ANY
> dir0): rowcount = 3.75, cumulative cost = {53.75 rows, 168.75 cpu, 0.0 io,
> 0.0 network, 0.0 memory}, id = 664188
> 00-04 Filter(condition=[=($1, '.drill.parquet_metadata')]) :
> rowType = RecordType(ANY T51¦¦*, ANY dir0): rowcount = 3.75, cumulative cost
> = {50.0 rows, 165.0 cpu, 0.0 io, 0.0 network, 0.0 memory}, id = 664187
> 00-05 Project(T51¦¦*=[$0], dir0=[$1]) : rowType = RecordType(ANY
> T51¦¦*, ANY dir0): rowcount = 25.0, cumulative cost = {25.0 rows, 50.0 cpu,
> 0.0 io, 0.0 network, 0.0 memory}, id = 664186
> 00-06 Scan(groupscan=[ParquetGroupScan
> [entries=[ReadEntryWithPath
> [path=/tmp/querylogs_4/2005/May/voter25.parquet/0_0_0.parquet]],
> selectionRoot=/tmp/querylogs_4, numFiles=1, usedMetadataFile=true,
> columns=[`*`]]]) : rowType = (DrillRecordRow[*, dir0]): rowcount = 25.0,
> cumulative cost = {25.0 rows, 50.0 cpu, 0.0 io, 0.0 network, 0.0 memory}, id
> = 664185
> {code}
> Here is the plan for the same query against the same directory structure
> without meta data cache:
> {code}
> 00-00 Screen : rowType = RecordType(ANY *): rowcount = 75.0, cumulative
> cost = {82.5 rows, 157.5 cpu, 0.0 io, 0.0 network, 0.0 memory}, id = 664312
> 00-01 Project(*=[$0]) : rowType = RecordType(ANY *): rowcount = 75.0,
> cumulative cost = {75.0 rows, 150.0 cpu, 0.0 io, 0.0 network, 0.0 memory}, id
> = 664311
> 00-02 Project(*=[$0]) : rowType = RecordType(ANY *): rowcount = 75.0,
> cumulative cost = {75.0 rows, 150.0 cpu, 0.0 io, 0.0 network, 0.0 memory}, id
> = 664310
> 00-03 Scan(groupscan=[ParquetGroupScan [entries=[ReadEntryWithPath
> [path=maprfs:///tmp/querylogs_1/1985/Feb/voter10.parquet/0_0_0.parquet],
> ReadEntryWithPath
> [path=maprfs:///tmp/querylogs_1/1985/jan/voter5.parquet/0_0_0.parquet],
> ReadEntryWithPath
> [path=maprfs:///tmp/querylogs_1/1985/apr/voter65.parquet/0_0_0.parquet]],
> selectionRoot=maprfs:/tmp/querylogs_1, numFiles=3, usedMetadataFile=false,
> columns=[`*`]]]) : rowType = (DrillRecordRow[*, dir0]): rowcount = 75.0,
> cumulative cost = {75.0 rows, 150.0 cpu, 0.0 io, 0.0 network, 0.0 memory}, id
> = 664309
> {code}
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