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 for 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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