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From "Victoria Markman (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-2806) Querying data from compressed csv file returns nulls and unreadable data
Date Thu, 16 Apr 2015 22:18:59 GMT

    [ https://issues.apache.org/jira/browse/DRILL-2806?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14498854#comment-14498854
] 

Victoria Markman commented on DRILL-2806:
-----------------------------------------

Steven, thanks for the explanation and your suggestion sounds like the right thing to do.

> Querying data from compressed csv file returns nulls and unreadable data
> ------------------------------------------------------------------------
>
>                 Key: DRILL-2806
>                 URL: https://issues.apache.org/jira/browse/DRILL-2806
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Storage - Text & CSV
>    Affects Versions: 0.9.0
>         Environment: 9d92b8e319f2d46e8659d903d355450e15946533 | DRILL-2580: Exit early
from HashJoinBatch if build side is empty | 26.03.2015
>            Reporter: Khurram Faraaz
>            Assignee: Steven Phillips
>
> Project columns from a compressed CSV data file returns unreadable data and nulls in
the query results. Querying the same CSV file in uncompressed format, the query returns correct
results, readable data and no nulls. Test was performed on 4 node cluster on CentOS.
> {code}
> 0: jdbc:drill:> select columns[0], columns[1], columns[2], columns[3], columns[4],
columns[5], columns[6], columns[7] from `deletions-00000-of-00020.tgz` limit 10;
> +------------+------------+------------+------------+------------+------------+------------+------------+
> |   EXPR$0   |   EXPR$1   |   EXPR$2   |   EXPR$3   |   EXPR$4   |   EXPR$5   |   EXPR$6
  |   EXPR$7   |
> +------------+------------+------------+------------+------------+------------+------------+------------+
> | 0U[ˮȑ|axaR)ﺫ=鲍i̊HDJ|?3̑$%Q$%
>                                                 TdfD8'2i$E^/Y}C'>|/7
>                                                                                   H1o0!
| 0g TMUܸW`ʙ&T
>                                                                                     
                                           \uXپN|2I~Y 0RAX6UaXe+ow*]s | null       | null
      | null       | null       | null       | null       |
> | oM.ڻU/ | ̼\
>                            )qwda7((
>                                                	y[) | 9>^0>WM[{r]iE$ze&!EküIfa
| null       | null       | null       | null       | null       |
> | SRΠ     | null       | null       | null       | null       | null       | null 
     | null       |
> | 6imJ\f_dYڿ]%ln3IaE*BGA-a$j:M!Uc)ﶘD~wUx0ɼgme]ӘcQ*pk$%\2ER-)(ÈxTn?SϓxeҜݠºI|'(Cni
s | null       | null       | null       | null       | null       | null       | null   
   |
> | bxΜkr4ü_nIxl_s`vN	ó.$OL7Eބyڗia;Pu$M!AoCӦnlS-`ۢ+o~>%wzcgwtMge7"lMgZ=WྃgMRX1"a
| X=Rd.fab{t{
>                                                                                     
                                                                                         
        A!t
>                                                                                     
                                                                                         
                1$ڧw-0EXURg
>                                                                                     
                                                                                         
                                       p	#qzߤ΢gWMem{=z{
>                                                                                     
                                                                                         
                                                                     eiA]^ | null       |
null       | null       | null       | null       | null       |
> | ֌        | null       | null       | null       | null       | null       | null 
     | null       |
> | !{1H*m71`˰]oZ | 𾳔] &f4Z)4SP7Rm4^5WWXȧ<p.́3L
>                                                                                     
 q%|WL-p[ | null       | null       | null       | null       | null       | null       |
> | dqyd\K#"ԁ@ | null       | null       | null       | null       | null       | null
      | null       |
> | [GԊKFlɢ(ZK8h#D/[(U=_8ΏE%
>                                                            [;
>                                                               w}Fr`#Xk
>                                                                               lT'15:y
>                                                                                     
          ņPz(-ȓ񆹞Cs)1v	 | null       | null       | null       | null       | null  
    | null       | null       |
> | LyPO|Ώ(+n+H]
>                          Ņ2?糩s/_ l
>                                             +ӯb	 | null       | null       | null  
    | null       | null       | null       | null       |
> +------------+------------+------------+------------+------------+------------+------------+------------+
> 10 rows selected (0.176 seconds)
> 0: jdbc:drill:> select columns[0], columns[1], columns[2], columns[3], columns[4],
columns[5], columns[6], columns[7] from `deletions/deletions-00000-of-00020.csv` limit 10;
> +------------+------------+------------+------------+------------+------------+------------+------------+
> |   EXPR$0   |   EXPR$1   |   EXPR$2   |   EXPR$3   |   EXPR$4   |   EXPR$5   |   EXPR$6
  |   EXPR$7   |
> +------------+------------+------------+------------+------------+------------+------------+------------+
> | 1354980518007 | /user/mwcl_musicbrainz | 1356247116000 | /user/google_gardener | /m/0nj707g
| /music/track_contribution/contributor | /m/09xmq3  | en         |
> | 1359609261000 | /user/ahsan2002us | 1359697206000 | /user/mjsigua | /m/0q47ym9 | /common/topic/description
| Afrosheen CEO is the fictional character from the 2003 film The Watermelon Heist. | en 
       |
> | 1258294630005 | /user/book_bot | 1260214155000 | /user/book_bot | /m/08g19rh | /book/book_edition/book
| /m/04sty07 | en         |
> | 1260232964000 | /user/book_bot | 1360880749000 | /user/turtlewax_bot | /m/0872_f2 |
/book/book_edition/book | /m/069_gyc | en         |
> | 1320298552000 | /user/gardening_bot | 1358083965004 | /user/googlebot | /m/01dy3t2
| /type/object/type | /music/single | en         |
> | 1360430129006 | /user/mwcl_musicbrainz | 1362830875001 | /user/mwcl_musicbrainz | /m/0qm1x62
| /music/release_track/release | /m/0ql38vr | en         |
> | 1269251105000 | /user/mwcl_images | 1336539194001 | /user/gardening_bot | /m/06w7yw7
| /common/topic/image | /m/0bcncxt | en         |
> | 1225386250001 | /user/mwcl_images | 1336080683003 | /user/gardening_bot | /m/04sb526
| /common/licensed_object/license | /m/02x6b   | en         |
> | 1286991487000 | /user/mw_template_bot | 1362532733000 | /user/wikipedia_facts | /m/0dgs170
| /people/person/date_of_birth | 1975       | en         |
> | 1258986090000 | /user/book_bot | 1260138587000 | /user/book_bot | /m/08r_m33 | /book/book_edition/book
| /m/04sty07 | en         |
> +------------+------------+------------+------------+------------+------------+------------+------------+
> 10 rows selected (0.25 seconds)
> Details of the files (compressed and uncompressed)
> [root@centos-01 ~]# hadoop fs -ls /tmp/deletions-00000-of-00020.tgz
> -rwxr-xr-x   3 root root  111364147 2015-04-16 20:35 /tmp/deletions-00000-of-00020.tgz
> [root@centos-01 ~]# hadoop fs -ls /tmp/deletions/deletions-00000-of-00020.csv
> -rwxr-xr-x   3 root root  395624293 2015-04-14 18:10 /tmp/deletions/deletions-00000-of-00020.csv
> {code}



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