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https://issues.apache.org/jira/browse/DRILL-4203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15529814#comment-15529814
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Vitalii Diravka commented on DRILL-4203:
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No, it will not. This property in parquet metadata. For example:
{code}
creator: parquet-mr version 1.8.1-drill-r0 (build
6b605a4ea05b66e1a6bf843353abcb4834a4ced8)
extra: drill.version = 1.9.0-SNAPSHOT
extra: is.date.correct = true
{code}
Old drill versions just can’t read this meta info but can read new parquet
files.
Although by reason of new parquet files will consist correct DATE values, old
drill versions, surely, will read these DATE values incorrectly from new
parquet files.
> 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
>
> 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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