Hello all,
we have been hit by org.apache.pig.backend.executionengine.ExecException: ERROR
1071: Cannot convert a Unknown to a String
at org.apache.pig.data.DataType.toString(DataType.java:1105)
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POCast.getNext(POCast.java:932)
Questions:
- How can I generate this error? Have been trying with null fields to cast them
to char arrays etc but don't succeed
- What is the best approach to find the origin of this exception? We are
processing a lot of data…is it the data is it the UDFs we have developed?
--
kind regards,
Geert Van Landeghem
