[jira] [Created] (DRILL-7444) JSON blank result on SELECT when too much byte in multiple files

["benj (Jira)" <ji...@apache.org>]

benj created DRILL-7444:
---------------------------

             Summary: JSON blank result on SELECT when too much byte in multiple files 
                 Key: DRILL-7444
                 URL: https://issues.apache.org/jira/browse/DRILL-7444
             Project: Apache Drill
          Issue Type: Bug
          Components: Storage - JSON
    Affects Versions: 1.17.0
            Reporter: benj


2 files (a.json and b.json) and the concat of these 2 file (ab.json) produce different results on a simple _SELECT_.

Problem appears from a number of byte (~ 102 400 000 in my case)
{code:bash}
#!/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
{code}
{noformat}
== I ==
$ gen.sh 10000 > a.json
$ gen.sh 239 > b.json
$ wc -c *.json
100000000 a.json
  2390000 b.json
102390000 total

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

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

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

{noformat}

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



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