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https://issues.apache.org/jira/browse/DRILL-4203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15546922#comment-15546922
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Rahul Challapalli commented on DRILL-4203:
------------------------------------------
I am trying to query one of the files generated by drill-0.8 . The parquet-meta
command returned "creator: parquet-mr" for this specific file. So using
this field we cannot determine whether it is a drill created file or not. Hence
I expected the below query to return me a date which is thousands of years into
the future (as auto-correction should not have taken place). However I am
getting the correct value. Am I missing something?
{code}
select l_shipdate, l_commitdate from
dfs.`/drill/testdata/parquet_date/dates_nodrillversion/drillgen2_lineitem`
limit 1;
+-------------+---------------+
| l_shipdate | l_commitdate |
+-------------+---------------+
| 1996-03-13 | 1996-02-12 |
+-------------+---------------+
1 row selected (0.207 seconds)
{code}
Also one of [~jaltekruse] comments read "While the old behavior was a
consistent shift into an unlikely range to be used in a modern database (over
10,000 years in the future), these are still valid date values". I am wondering
how to create parquet files with such dates as the date format generally uses
only upto 4 digits to represent the year part.
> 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: Stéphane Trou
> Assignee: Vitalii Diravka
> Priority: Critical
> Fix For: 1.9.0
>
>
> 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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