Introduction to attribute indexes en

Overview

A forward index is an index that stores the values of a specific field (attribute) in a document and is used for filtering, counting, sorting, or scoring. The forward index is also known as an attribute index or a profile index. “Forward” indicates the mapping from documents to fields in the documents.

Attribute types of attribute indexes

The engine supports the following attribute types:

Attribute type	Description	Single-value	Multi-value
INT8	Stores 8-bit signed integers.	id=-27	id=-27]26]33
UINT8	Stores 8-bit unsigned integers.	id=56	id=27]222]32
INT16	Stores 16-bit signed integers.	id=-2724	id=-1217^]236
UINT16	Stores 16-bit unsigned integers.	id=65531	id=-65531]22236]0^]1
INTEGER	Stores 32-bit signed integers.	id=-655312	id=-2714442]2344126]33441
UINT32	Stores 32-bit unsigned integers.	id=65537	id=4011341512]26]33
INT64	Stores 64-bit signed integers.	id=-551533527	id=-2416664447]236]133
UINT64	Stores 64-bit unsigned integers.	id=23545114533527	id=12416664447]121436]2
FLOAT	Stores single-precision 32-bit floating points.	id=3.14	id=3.25]3.50]3.75
DOUBLE	Stores double-precision 64-bit floating points.	id=3.1415926	id=-3.1415926]26.1444]55.1441
STRING	Stores strings.	id=abc	id=abc]def]dgg^]dd