Package org.apache.druid.query.filter.vector

Interface VectorValueMatcher

All Superinterfaces:

VectorSizeInspector

All Known Implementing Classes:

BaseVectorValueMatcher, BooleanVectorValueMatcher

public interface VectorValueMatcher
extends VectorSizeInspector

An object that returns a boolean indicating if the "current" row should be selected or not. The most prominent use of this interface is that it is returned by the Filter "makeVectorMatcher" method, where it is used to identify selected rows for filtered cursors and filtered aggregators.

Method Summary

Modifier and Type	Method	Description
static VectorValueMatcher	allFalseMultiValueDimensionMatcher(MultiValueDimensionVectorSelector selector)	Make an always false VectorValueMatcher for a MultiValueDimensionVectorSelector.
static VectorValueMatcher	allFalseObjectMatcher(VectorObjectSelector selector)	Make an always false VectorValueMatcher for a VectorObjectSelector.
static VectorValueMatcher	allFalseSingleValueDimensionMatcher(SingleValueDimensionVectorSelector selector)	Make an always false VectorValueMatcher for a SingleValueDimensionVectorSelector.
static BaseVectorValueMatcher	allFalseValueMatcher(VectorValueSelector selector)	Make an always false VectorValueMatcher for a VectorValueSelector.
ReadableVectorMatch	match(ReadableVectorMatch mask, boolean includeUnknown)	Examine the current vector and return a match indicating what is accepted.
static ReadableVectorMatch	matchNulls(ReadableVectorMatch mask, VectorMatch match, boolean[] nullVector)
static VectorValueMatcher	nullMatcher(VectorValueSelector selector)	Make a VectorValueMatcher that only selects input rows with null values

Methods inherited from interface org.apache.druid.segment.vector.VectorSizeInspector

getCurrentVectorSize, getMaxVectorSize

Method Details

match

ReadableVectorMatch match(ReadableVectorMatch mask,
 boolean includeUnknown)

Examine the current vector and return a match indicating what is accepted.

Does not modify "mask".

Parameters:

mask - must not be null; use VectorMatch.allTrue(int) if you don't need a mask.

includeUnknown - mapping for Druid native two state logic system into SQL three-state logic system. If set to true, match vectors returned by this method should include true values wherever the matching result is 'unknown', such as from the input being null valued.

Returns:

the subset of "mask" that this value matcher accepts. May be the same instance as if every row in the mask matches the filter.

nullMatcher

static VectorValueMatcher nullMatcher(VectorValueSelector selector)

Make a VectorValueMatcher that only selects input rows with null values

Parameters:

selector -

Returns:

allFalseSingleValueDimensionMatcher

static VectorValueMatcher allFalseSingleValueDimensionMatcher(SingleValueDimensionVectorSelector selector)

Make an always false VectorValueMatcher for a SingleValueDimensionVectorSelector. When includeUnknown is specified to the match(ReadableVectorMatch, boolean) function, this matcher will add all rows of SingleValueDimensionVectorSelector.getRowVector() which are null to the ReadableVectorMatch as selections, to participate in Druid 2-state logic system to SQL 3-state logic system conversion.

allFalseMultiValueDimensionMatcher

static VectorValueMatcher allFalseMultiValueDimensionMatcher(MultiValueDimensionVectorSelector selector)

Make an always false VectorValueMatcher for a MultiValueDimensionVectorSelector. When includeUnknown is specified to the match(ReadableVectorMatch, boolean) function, this matcher will add all rows of MultiValueDimensionVectorSelector.getRowVector() which are empty or have any null elements to the ReadableVectorMatch as selections, to participate in Druid 2-state logic system to SQL 3-state logic system conversion (as best as a multi-value dimension can).

allFalseValueMatcher

static BaseVectorValueMatcher allFalseValueMatcher(VectorValueSelector selector)

Make an always false VectorValueMatcher for a VectorValueSelector. When includeUnknown is specified to the match(ReadableVectorMatch, boolean) function, this matcher will add the rows indicated as null values of VectorValueSelector.getNullVector() to the ReadableVectorMatch as selections, to participate in Druid 2-state logic system to SQL 3-state logic system conversion.

allFalseObjectMatcher

static VectorValueMatcher allFalseObjectMatcher(VectorObjectSelector selector)

Make an always false VectorValueMatcher for a VectorObjectSelector. When includeUnknown is specified to the match(ReadableVectorMatch, boolean) function, this matcher will add all rows of VectorObjectSelector.getObjectVector() which are null to the ReadableVectorMatch as selections, to participate in Druid 2-state logic system to SQL 3-state logic system conversion.

matchNulls

static ReadableVectorMatch matchNulls(ReadableVectorMatch mask,
 VectorMatch match,
 @Nullable
 boolean[] nullVector)