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From "David Ciemiewicz (JIRA)" <j...@apache.org>
Subject [jira] Created: (PIG-760) Serialize schemas for PigStorage() and other storage types.
Date Wed, 08 Apr 2009 22:46:12 GMT
Serialize schemas for PigStorage() and other storage types.

                 Key: PIG-760
                 URL: https://issues.apache.org/jira/browse/PIG-760
             Project: Pig
          Issue Type: New Feature
            Reporter: David Ciemiewicz

I'm finding PigStorage() really convenient for storage and data interchange because it compresses
well and imports into Excel and other analysis environments well.

However, it is a pain when it comes to maintenance because the columns are in fixed locations
and I'd like to add columns in some cases.

It would be great if load PigStorage() could read a default schema from a .schema file stored
with the data and if store PigStorage() could store a .schema file with the data.

I have tested this out and both Hadoop HDFS and Pig in -exectype local mode will ignore a
file called .schema in a directory of part files.

So, for example, if I have a chain of Pig scripts I execute such as:

A = load 'data-1' using PigStorage() as ( a: int , b: int );

store A into 'data-2' using PigStorage();

B = load 'data-2' using PigStorage();

describe B;

describe B should output something like { a: int, b: int }

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