Package org.apache.druid.segment.projections

Class ProjectionFilterMatch

java.lang.Object

org.apache.druid.segment.filter.TrueFilter

org.apache.druid.segment.projections.ProjectionFilterMatch

All Implemented Interfaces:

Filter

public final class ProjectionFilterMatch
extends TrueFilter

Terminal marker indicating that a Filter can be dropped because it matches the filter of a projection

Method Summary

Modifier and Type	Method	Description
static Filter	rewriteFilter(Filter projectionFilter, Filter queryFilter)	Rewrites a query Filter if possible, removing the Filter of a projection.

Methods inherited from class org.apache.druid.segment.filter.TrueFilter

canVectorizeMatcher, equals, getBitmapColumnIndex, getRequiredColumns, hashCode, instance, makeMatcher, makeVectorMatcher, rewriteRequiredColumns, supportsRequiredColumnRewrite, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.druid.query.filter.Filter

makeFilterBundle

Method Details

rewriteFilter

@Nullable
public static Filter rewriteFilter(Filter projectionFilter,
 Filter queryFilter)

Rewrites a query Filter if possible, removing the Filter of a projection. To match a projection filter, the query filter must be equal to the projection filter, or must contain the projection filter as the child of an AND filter. This method returns null indicating that a rewrite is impossible with the implication that the query cannot use the projection because the projection doesn't contain all the rows the query would match if not using the projection.