Operators should pass ObjectInspector in init instead of forward
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Key: HIVE-405
URL: https://issues.apache.org/jira/browse/HIVE-405
Project: Hadoop Hive
Issue Type: Bug
Components: Query Processor
Affects Versions: 0.4.0
Reporter: Zheng Shao
Priority: Critical
We are always passing the same ObjectInspector, so there is no need to pass it
again and again in forward.
Also there is a problem that can ONLY be fixed by passing ObjectInspector in
init: Outer Joins - Outer Joins may not be able to get ObjectInspectors for all
inputs, as a result, there is no way to construct an output ObjectInspector
based on the inputs. Currently we have hard-coded code that assumes joins are
always outputting Strings, which did break but was hidden by the old framework
(because we do toString() when serializing the output, and toString() is
defined for all Java Classes).
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