[DRILL-7444] JSON blank result on SELECT when too much byte in multiple files on Drill embedded

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 1.17.0
• Component/s: Storage - JSON
• Assignee: Unassigned
• Reporter: benj
• Created: 14/Nov/19 10:11
• Updated: 14/Nov/19 21:13

Description

2 files (a.json and b.json) and the concat of these 2 file (ab.json) produce different results on a simple SELECT when using Drill embedded.

Problem appears from a number of byte (~ 102 400 000 in my case)

#!/bin/bash
# script gen.sh to reproduce the problem
for ((i=1;i<=$1;++i));
do
    echo -n '{"At":"'
    for j in {1..999};
    do
	echo -n 'aaaaabbbbb'
    done
    echo '"}'
done

== I ==
$ gen.sh 10000 > a.json
$ gen.sh 239 > b.json
$ wc -c *.json
100000000 a.json
  2390000 b.json
102390000 total
$ bash drill-embedded
apache drill> SELECT * FROM dfs.tmp.`*.json` LIMIT 1;
+--------------------+
|       At           |
+--------------------+
| aaaaabbbbaaaaab... |
+--------------------+
=> All is fine here


== II ==
$ gen.sh 10000 > a.json
$ gen.sh 240 > b.json
$ wc -c *.json
100000000 a.json
  2400000 b.json
102400000 total
$ bash drill-embedded
apache drill> SELECT * FROM dfs.tmp.`*.json` LIMIT 1;
+--------------------+
|       At           |
+--------------------+
|                    |
+--------------------+
=> In a surprising way field `At` is empty

== III ==
$ gen.sh 10240 > ab.json
$ wc -c *.json 
102400000 ab.json
$ bash drill-embedded
apache drill> SELECT * FROM dfs.tmp.`c.json` LIMIT 1;
+--------------------+ 
|        At          |
+--------------------+
| aaaaabbbbaaaaab... |
+--------------------+
=> All is fine here although the number of lines is equal to case II
  

The Version of the Drill 1.17 tested here is the latest at 2019-11-13
This problem doesn't appears with Drill embedded 1.16