I tried PigStorage, seems it is Ok. Suspect the issue is in
CassandraStorage only. Where can I find the source code of it?
On 04/07/2011 11:56 PM, Badrinarayanan S wrote:
Hi Daniel,
I was using Pig 0.8.0, I also ran against latest trunk. Still same issue.
Thanks,
badri
-----Original Message-----
From: Daniel Dai [mailto:[email protected]]
Sent: Friday, April 08, 2011 3:53 AM
To: [email protected]
Subject: Re: Pig filter against flatten column
Which version of Pig are you using? Previous version of Pig have trouble
cast nested types. Can you try latest trunk?
Daniel
On 04/07/2011 05:26 AM, Badrinarayanan S wrote:
Hi,
I am trying to run a filter against a column which is the result of a
flatten operation. But the filter clause throws an exception as
org.apache.pig.data.DataByteArray cannot be cast to java.lang.String. The
exception is against the line doing the matches filter. If I change
matches
to eq, I am not getting the exception and I don't get any result though I
have ColumnName having 'Page'.
Suspect the datatype of the ColumnName (which is result of flatten) of the
relation VisitPages is still bytearray. I have tried casting it to
chararray
still same exception. However if I describe of VisitDetails it shows as
chararray. Any suggestions?
Below is the pig script:
Visits = LOAD 'cassandra://test/Visits' USING CassandraStorage() as (Id,
DetailsBag:bag{DetailsTuple:tuple(VisitTimestamp:chararray,
VisitDetails:bag{VisitColumns:tuple(ColumnName:chararray,
ColumnValue:chararray)})});
VisitsFlattened = FOREACH Visits GENERATE Id,
FLATTEN(DetailsBag.VisitDetails);
VisitDetailsFlattened = FOREACH VisitsFlattened GENERATE Id,
FLATTEN(VisitDetails);
VisitDetails = FOREACH VisitDetailsFlattened GENERATE
(chararray)ColumnName,
(chararray)ColumnValue, (chararray)Id;
DESCRIBE VisitDetails;
VisitPages = FILTER VisitDetails BY (ColumnName MATCHES 'Page');
dump VisitPages;
......
Thanks,
badri
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