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Posted to dev@crunch.apache.org by "Dave Beech (JIRA)" <ji...@apache.org> on 2013/04/09 16:38:16 UTC
[jira] [Created] (CRUNCH-195) NullPointerException when writing
PTables created by PTables.asPTable as Avro
Dave Beech created CRUNCH-195:
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Summary: NullPointerException when writing PTables created by PTables.asPTable as Avro
Key: CRUNCH-195
URL: https://issues.apache.org/jira/browse/CRUNCH-195
Project: Crunch
Issue Type: Bug
Components: Core
Affects Versions: 0.5.0
Reporter: Dave Beech
Assignee: Josh Wills
See code fragment below. This is a left join where not all keys match, so some values on the right-hand side of the Pairs are null.
---
PTable<String,String> a = ...
PTable<String,String> b = ...
PTable<String,Pair<String,String>> joined = Join.leftJoin(a, b);
PCollection<Pair<String, String>> joinedValuesCollection = joined.values();
joinedValuesCollection.write(To.avroFile("joined-pcol"));
PTable<String,String> joinedValuesTable = PTables.asPTable(joinedValuesCollection);
joinedValuesTable.write(To.avroFile("joined-ptable"));
---
The first write to "joined-pcol" works, and the resulting Avro schema is a Pair of type union ['string','null'].
The second write to "joined-ptable" fails with NPE - it appears the String types are no longer unioned with null and the values are being rejected by the output format.
I think this is a bug. The output schema of the PTable should be the same as it was before it was converted from PCollection<Pair<...>>
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