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From "Zelaine Fong (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-4203) Parquet File : Date is stored wrongly
Date Sat, 23 Jan 2016 05:52:39 GMT

    [ https://issues.apache.org/jira/browse/DRILL-4203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15113591#comment-15113591
] 

Zelaine Fong commented on DRILL-4203:
-------------------------------------

[~jaltekruse] - when you say this change will be transparent to users, are you saying Drill
will automatically detect that the data is in the wrong format, and update it to the corrected
value when attempts are made to read the value?

> Parquet File : Date is stored wrongly
> -------------------------------------
>
>                 Key: DRILL-4203
>                 URL: https://issues.apache.org/jira/browse/DRILL-4203
>             Project: Apache Drill
>          Issue Type: Bug
>    Affects Versions: 1.4.0
>            Reporter: St├ęphane Trou
>            Assignee: Jason Altekruse
>            Priority: Critical
>
> Hello,
> I have some problems when i try to read parquet files produce by drill with  Spark, 
all dates are corrupted.
> I think the problem come from drill :)
> {code}
> cat /tmp/date_parquet.csv 
> Epoch,1970-01-01
> {code}
> {code}
> 0: jdbc:drill:zk=local> select columns[0] as name, cast(columns[1] as date) as epoch_date
from dfs.tmp.`date_parquet.csv`;
> +--------+-------------+
> |  name  | epoch_date  |
> +--------+-------------+
> | Epoch  | 1970-01-01  |
> +--------+-------------+
> {code}
> {code}
> 0: jdbc:drill:zk=local> create table dfs.tmp.`buggy_parquet`as select columns[0] as
name, cast(columns[1] as date) as epoch_date from dfs.tmp.`date_parquet.csv`;
> +-----------+----------------------------+
> | Fragment  | Number of records written  |
> +-----------+----------------------------+
> | 0_0       | 1                          |
> +-----------+----------------------------+
> {code}
> When I read the file with parquet tools, i found  
> {code}
> java -jar parquet-tools-1.8.1.jar head /tmp/buggy_parquet/
> name = Epoch
> epoch_date = 4881176
> {code}
> According to [https://github.com/Parquet/parquet-format/blob/master/LogicalTypes.md#date],
epoch_date should be equals to 0.
> Meta : 
> {code}
> java -jar parquet-tools-1.8.1.jar meta /tmp/buggy_parquet/
> file:        file:/tmp/buggy_parquet/0_0_0.parquet 
> creator:     parquet-mr version 1.8.1-drill-r0 (build 6b605a4ea05b66e1a6bf843353abcb4834a4ced8)

> extra:       drill.version = 1.4.0 
> file schema: root 
> --------------------------------------------------------------------------------
> name:        OPTIONAL BINARY O:UTF8 R:0 D:1
> epoch_date:  OPTIONAL INT32 O:DATE R:0 D:1
> row group 1: RC:1 TS:93 OFFSET:4 
> --------------------------------------------------------------------------------
> name:         BINARY SNAPPY DO:0 FPO:4 SZ:52/50/0,96 VC:1 ENC:RLE,BIT_PACKED,PLAIN
> epoch_date:   INT32 SNAPPY DO:0 FPO:56 SZ:45/43/0,96 VC:1 ENC:RLE,BIT_PACKED,PLAIN
> {code}



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