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From "Sivanesan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-5795) Hive should be able to skip header and footer rows when reading data file for a table
Date Thu, 17 Dec 2015 07:00:54 GMT

    [ https://issues.apache.org/jira/browse/HIVE-5795?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15061630#comment-15061630
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Sivanesan commented on HIVE-5795:
---------------------------------

But it was the other way around. It was able to skip if the file size is lesser than block
size and skips random detail record if the file size is more than block size.

My assumption: While using CombineHiveInputFormat, a record around end of first block is skipped.

> Hive should be able to skip header and footer rows when reading data file for a table
> -------------------------------------------------------------------------------------
>
>                 Key: HIVE-5795
>                 URL: https://issues.apache.org/jira/browse/HIVE-5795
>             Project: Hive
>          Issue Type: New Feature
>            Reporter: Shuaishuai Nie
>            Assignee: Shuaishuai Nie
>              Labels: TODOC13
>             Fix For: 0.13.0
>
>         Attachments: HIVE-5795.1.patch, HIVE-5795.2.patch, HIVE-5795.3.patch, HIVE-5795.4.patch,
HIVE-5795.5.patch
>
>
> Hive should be able to skip header and footer lines when reading data file from table.
In this way, user don't need to processing data which generated by other application with
a header or footer and directly use the file for table operations.
> To implement this, the idea is adding new properties in table descriptions to define
the number of lines in header and footer and skip them when reading the record from record
reader. An DDL example for creating a table with header and footer should be like this:
> {code}
> Create external table testtable (name string, message string) row format delimited fields
terminated by '\t' lines terminated by '\n' location '/testtable' tblproperties ("skip.header.line.count"="1",
"skip.footer.line.count"="2");
> {code}



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