org.apache.druid.segment.column

Interface ColumnIndexCapabilities

All Known Implementing Classes:

SimpleColumnIndexCapabilities

public interface ColumnIndexCapabilities

Sort of like ColumnCapabilities, except for indexes supplied by ColumnIndexSelector, provides information for how query processing may use indexes.

Method Summary

Modifier and Type	Method and Description
boolean	isExact() Indicates if an index is an exact match, or should also be post-filtered with a value matcher.
boolean	isInvertible() Indicates if an index can be inverted for use with a 'NOT' filter.
ColumnIndexCapabilities	merge(ColumnIndexCapabilities other)

Method Detail

isInvertible

boolean isInvertible()

Indicates if an index can be inverted for use with a 'NOT' filter. Some types of indexes may not be invertible, such as those which provide false positive matches.

isExact

boolean isExact()

Indicates if an index is an exact match, or should also be post-filtered with a value matcher. Filters which are not an exact match must always use a value matcher as a post-filter, even if they have an index.

merge

ColumnIndexCapabilities merge(ColumnIndexCapabilities other)