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From rahul challapalli <challapallira...@gmail.com>
Subject Re: Parquet Date Format Problem
Date Tue, 01 Nov 2016 18:28:21 GMT
The fix will be available with the Drill 1.9 release unless you want to
build from source yourself.

On Tue, Nov 1, 2016 at 11:24 AM, Lee, David <David.Lee@blackrock.com> wrote:

> Nevermind.. Found the problem..
>
> https://issues.apache.org/jira/browse/DRILL-4203
>
>
> David Lee
> Vice President | BlackRock
> Phone: +1.415.670.2744 | Mobile: +1.415.706.6874
>
> From: Lee, David
> Sent: Tuesday, November 01, 2016 11:21 AM
> To: 'user@drill.apache.org' <user@drill.apache.org>
> Subject: Parquet Date Format Problem
>
> I created a parquet file using Drill, but date values in the parquet files
> don’t appear to be a logical INT32 type and as such when I’m trying to read
> the parquet file in Spark it looks corrupted..
>
> Here’s my test case..
>
>
> A.     Create a test.txt file in /tmp:
>
> as_of
> 2016-09-30
>
>
> B.     Convert it to parquet using Drill:
>
> 0: jdbc:drill:zk=local> create table dfs.tmp.`/test` as select cast(as_of
> AS date) as as_of from table(dfs.`/tmp/test.txt`(type => 'text',
> fieldDelimiter => ',', extractHeader => true));
>
>
> C.    Read the new file using Drill which looks fine:
>
>
> 0: jdbc:drill:zk=local> select * from dfs.`/tmp/test`;
> +-------------+
> |    as_of    |
> +-------------+
> | 2016-09-30  |
> +-------------+
>
>
> D.    However running parquet-tools on it gives a completely different
> result:
>
> java -jar parquet-tools-1.6.1-SNAPSHOT.jar head -n3 /tmp/test
> as_of = 4898250
>
> java -jar parquet-tools-1.6.1-SNAPSHOT.jar schema /tmp/test/0_0_0.parquet
> message root {
>   required int32 as_of (DATE);
> }
>
> According to the Parquet docs.. 4898250 days after Jan 1st 1970 is
> sometime in the year 15,435..
>
> https://github.com/Parquet/parquet-format/blob/master/LogicalTypes.md
> DATE
> DATE is used to for a logical date type, without a time of day. It must
> annotate an int32 that stores the number of days from the Unix epoch, 1
> January 1970.
>
>
>
> David Lee
> Vice President | BlackRock
> Phone: +1.415.670.2744 | Mobile: +1.415.706.6874
>
>
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