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https://issues.apache.org/jira/browse/PIG-2485?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13196626#comment-13196626
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Brandon Williams commented on PIG-2485:
---------------------------------------
The problem is, my schema can contain many tuples (with different schema in
each), and if I define the bag as containing more than one
ResourceSchema.validateSchema throws an InvalidSchemaException since it checks
that a bag only has one subfield.
As a more realistic example, my schema might look like:
(key: bytearray,columns: {(name: chararray,owner_id: chararray), (name:
chararray,item_count: integer), (name: chararray,score: float)})
> Unable to find alias in a bag with nested schema
> ------------------------------------------------
>
> Key: PIG-2485
> URL: https://issues.apache.org/jira/browse/PIG-2485
> Project: Pig
> Issue Type: Bug
> Affects Versions: 0.9.2, 0.10
> Reporter: Brandon Williams
>
> I've created a loadfunc that implements LoadMetadata and returns a schema as
> follows:
> {noformat}
> (key: bytearray,columns: {((name: chararray,owner_id: chararray))})
> {noformat}
> (the code is at CASSANDRA-3371 if you want to take a look)
> However, whenever I try to access tuple fields within the bag, they cannot be
> found:
> {noformat}
> rows = LOAD 'cassandra://Keyspace1/Standard1' USING CassandraStorage();
> one = filter rows by columns.owner_id eq 'foo';
> dump one;
> {noformat}
> Produces:
> {noformat}
> 2012-01-20 20:12:14,858 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR
> 1200: Pig script failed to parse:
> <file foo.pig, line 2, column 7> pig script failed to validate:
> org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1128: Cannot find
> field owner_id in :tuple(name:chararray,owner_id:chararray)
> {noformat}
> Replacing the bag with another tuple works and all the fields are accessible.
> I've tried this against the 0.9 and 0.10 branch heads with no luck. Trunk
> produces a slight different error:
> {noformat}
> org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1000: Error during
> parsing. Pig script failed to parse:
> <file foo.pig, line 2, column 7> pig script failed to validate:
> org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1127: Index 1 out
> of range in schema::tuple(name:chararray,column_family:chararray)
> at org.apache.pig.PigServer$Graph.parseQuery(PigServer.java:1598)
> at org.apache.pig.PigServer$Graph.registerQuery(PigServer.java:1541)
> {noformat}
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