Serialize schemas for PigStorage() and other storage types.
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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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