Compile Time to use ObjectInspector instead of TypeInfo
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Key: HIVE-444
URL: https://issues.apache.org/jira/browse/HIVE-444
Project: Hadoop Hive
Issue Type: Improvement
Components: Query Processor
Affects Versions: 0.4.0
Reporter: Zheng Shao
Assignee: Zheng Shao
ObjectInspector contains TypeInfo and in-memory layout of the Object. Currently
the Compile Time uses TypeInfo, Runtime initialization uses ObjectInspector.
This complicates the system because a lot of stuff, like type resolution in
GenericUDF, needs to deal with both TypeInfo and ObjectInspectors. In this
transaction, we aim to simplify the system by providing a single way of
representing the metadata of the Object.
Steps:
1. Make ObjectInspector serializable
2. Replace TypeInfo in ColumnInfo with ObjectInspector
3. (Optional) Replace RowSchema with ObjectInspector, and use some real names
instead of field IDs to make it easier to understand.
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