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  1. Apache Drill
  2. DRILL-4720

MINDIR() and IMINDIR() functions return no results with metadata cache

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      Description

      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:

      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
      

      Here is the plan for the same query against the same directory structure without meta data cache:

      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
      

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              • Assignee:
                arina Arina Ielchiieva
                Reporter:
                knguyen Krystal
                Reviewer:
                Parth Chandra
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                  Updated:
                  Resolved: