org.apache.hadoop.hive.serde2.objectinspector

Interface ObjectInspector

All Superinterfaces:

Cloneable

All Known Subinterfaces:

BinaryObjectInspector, BooleanObjectInspector, ByteObjectInspector, ConstantObjectInspector, DateObjectInspector, DoubleObjectInspector, FloatObjectInspector, HiveCharObjectInspector, HiveDecimalObjectInspector, HiveIntervalDayTimeObjectInspector, HiveIntervalYearMonthObjectInspector, HiveVarcharObjectInspector, IntObjectInspector, ListObjectInspector, LongObjectInspector, MapObjectInspector, PrimitiveObjectInspector, SettableBinaryObjectInspector, SettableBooleanObjectInspector, SettableByteObjectInspector, SettableDateObjectInspector, SettableDoubleObjectInspector, SettableFloatObjectInspector, SettableHiveCharObjectInspector, SettableHiveDecimalObjectInspector, SettableHiveIntervalDayTimeObjectInspector, SettableHiveIntervalYearMonthObjectInspector, SettableHiveVarcharObjectInspector, SettableIntObjectInspector, SettableListObjectInspector, SettableLongObjectInspector, SettableMapObjectInspector, SettableShortObjectInspector, SettableStringObjectInspector, SettableTimestampObjectInspector, ShortObjectInspector, StringObjectInspector, TimestampObjectInspector, UnionObjectInspector, VoidObjectInspector

All Known Implementing Classes:

AbstractParquetMapInspector, AbstractPrimitiveJavaObjectInspector, AbstractPrimitiveLazyObjectInspector, AbstractPrimitiveObjectInspector, AbstractPrimitiveWritableObjectInspector, ArrayWritableObjectInspector, AvroLazyObjectInspector, BaseStructObjectInspector, DeepParquetHiveMapInspector, HCatRecordObjectInspector, JavaBinaryObjectInspector, JavaBooleanObjectInspector, JavaByteObjectInspector, JavaConstantBinaryObjectInspector, JavaConstantBooleanObjectInspector, JavaConstantByteObjectInspector, JavaConstantDateObjectInspector, JavaConstantDoubleObjectInspector, JavaConstantFloatObjectInspector, JavaConstantHiveCharObjectInspector, JavaConstantHiveDecimalObjectInspector, JavaConstantHiveVarcharObjectInspector, JavaConstantIntObjectInspector, JavaConstantLongObjectInspector, JavaConstantShortObjectInspector, JavaConstantStringObjectInspector, JavaConstantTimestampObjectInspector, JavaDateObjectInspector, JavaDoubleObjectInspector, JavaFloatObjectInspector, JavaHiveCharObjectInspector, JavaHiveDecimalObjectInspector, JavaHiveIntervalDayTimeObjectInspector, JavaHiveIntervalYearMonthObjectInspector, JavaHiveVarcharObjectInspector, JavaIntObjectInspector, JavaLongObjectInspector, JavaShortObjectInspector, JavaStringObjectInspector, JavaTimestampObjectInspector, JavaVoidObjectInspector, LazyBinaryListObjectInspector, LazyBinaryMapObjectInspector, LazyBinaryObjectInspector, LazyBinaryStructObjectInspector, LazyBinaryUnionObjectInspector, LazyBooleanObjectInspector, LazyByteObjectInspector, LazyDateObjectInspector, LazyDoubleObjectInspector, LazyFloatObjectInspector, LazyHiveCharObjectInspector, LazyHiveDecimalObjectInspector, LazyHiveIntervalDayTimeObjectInspector, LazyHiveIntervalYearMonthObjectInspector, LazyHiveVarcharObjectInspector, LazyIntObjectInspector, LazyListObjectInspector, LazyLongObjectInspector, LazyMapObjectInspector, LazyShortObjectInspector, LazySimpleStructObjectInspector, LazyStringObjectInspector, LazyTimestampObjectInspector, LazyUnionObjectInspector, LazyVoidObjectInspector, MetadataListStructObjectInspector, NullStructSerDe.NullStructSerDeObjectInspector, ParquetByteInspector, ParquetHiveArrayInspector, ParquetShortInspector, ParquetStringInspector, ReflectionStructObjectInspector, SettableStructObjectInspector, SettableUnionObjectInspector, StandardConstantListObjectInspector, StandardConstantMapObjectInspector, StandardListObjectInspector, StandardMapObjectInspector, StandardParquetHiveMapInspector, StandardStructObjectInspector, StandardUnionObjectInspector, StructObjectInspector, SubStructObjectInspector, ThriftUnionObjectInspector, UnionStructObjectInspector, WritableBinaryObjectInspector, WritableBooleanObjectInspector, WritableByteObjectInspector, WritableConstantBinaryObjectInspector, WritableConstantBooleanObjectInspector, WritableConstantByteObjectInspector, WritableConstantDateObjectInspector, WritableConstantDoubleObjectInspector, WritableConstantFloatObjectInspector, WritableConstantHiveCharObjectInspector, WritableConstantHiveDecimalObjectInspector, WritableConstantHiveIntervalDayTimeObjectInspector, WritableConstantHiveIntervalYearMonthObjectInspector, WritableConstantHiveVarcharObjectInspector, WritableConstantIntObjectInspector, WritableConstantLongObjectInspector, WritableConstantShortObjectInspector, WritableConstantStringObjectInspector, WritableConstantTimestampObjectInspector, WritableDateObjectInspector, WritableDoubleObjectInspector, WritableFloatObjectInspector, WritableHiveCharObjectInspector, WritableHiveDecimalObjectInspector, WritableHiveIntervalDayTimeObjectInspector, WritableHiveIntervalYearMonthObjectInspector, WritableHiveVarcharObjectInspector, WritableIntObjectInspector, WritableLongObjectInspector, WritableShortObjectInspector, WritableStringObjectInspector, WritableTimestampObjectInspector, WritableVoidObjectInspector

public interface ObjectInspector
extends Cloneable

ObjectInspector helps us to look into the internal structure of a complex object. A (probably configured) ObjectInspector instance stands for a specific type and a specific way to store the data of that type in the memory. For native java Object, we can directly access the internal structure through member fields and methods. ObjectInspector is a way to delegate that functionality away from the Object, so that we have more control on the behavior of those actions. An efficient implementation of ObjectInspector should rely on factory, so that we can make sure the same ObjectInspector only has one instance. That also makes sure hashCode() and equals() methods of java.lang.Object directly works for ObjectInspector as well.

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	ObjectInspector.Category Category.

Method Summary

Methods

Modifier and Type	Method and Description
ObjectInspector.Category	getCategory() An ObjectInspector must inherit from one of the following interfaces if getCategory() returns: PRIMITIVE: PrimitiveObjectInspector LIST: ListObjectInspector MAP: MapObjectInspector STRUCT: StructObjectInspector.
String	getTypeName() Returns the name of the data type that is inspected by this ObjectInspector.

Method Detail

getTypeName

String getTypeName()

Returns the name of the data type that is inspected by this ObjectInspector. This is used to display the type information to the user. For primitive types, the type name is standardized. For other types, the type name can be something like "list", "map", java class names, or user-defined type names similar to typedef.

getCategory

ObjectInspector.Category getCategory()

An ObjectInspector must inherit from one of the following interfaces if getCategory() returns: PRIMITIVE: PrimitiveObjectInspector LIST: ListObjectInspector MAP: MapObjectInspector STRUCT: StructObjectInspector.