ObjectInspector
ObjectInspector is an abstraction used in Apache Hive's SerDe API to inspect and manipulate the internal representation of data values stored in Hive tables. It provides a uniform way to access values regardless of how they are serialized or stored, enabling processing logic to operate on data in a type-safe manner without depending on a specific storage format.
The ObjectInspector framework defines a hierarchy of inspectors for primitive types and for complex types such
Key roles of ObjectInspector include supporting user-defined functions, SerDe implementations, and the Hive runtime in retrieving
Commonly used implementations include PrimitiveObjectInspector for primitive types and StructObjectInspector, ListObjectInspector, MapObjectInspector, and UnionObjectInspector for complex
In summary, ObjectInspector enables Hive to separate data storage details from data processing logic, providing a