parquet.filter2.statisticslevel

Class StatisticsFilter

java.lang.Object

parquet.filter2.statisticslevel.StatisticsFilter

All Implemented Interfaces:

FilterPredicate.Visitor<Boolean>

public class StatisticsFilter
extends Object
implements FilterPredicate.Visitor<Boolean>

Applies a FilterPredicate to statistics about a group of records. Note: the supplied predicate must not contain any instances of the not() operator as this is not supported by this filter. the supplied predicate should first be run through LogicalInverseRewriter to rewrite it in a form that doesn't make use of the not() operator. the supplied predicate should also have already been run through SchemaCompatibilityValidator to make sure it is compatible with the schema of this file. Returns true if all the records represented by the statistics in the provided column metadata can be dropped. false otherwise (including when it is not known, which is often the case).

Method Summary

Methods

Modifier and Type	Method and Description
static boolean	canDrop(FilterPredicate pred, List<ColumnChunkMetaData> columns)
Boolean	visit(Operators.And and)
<T extends Comparable<T>> Boolean	visit(Operators.Eq<T> eq)
<T extends Comparable<T>> Boolean	visit(Operators.Gt<T> gt)
<T extends Comparable<T>> Boolean	visit(Operators.GtEq<T> gtEq)
<T extends Comparable<T>,U extends UserDefinedPredicate<T>> Boolean	visit(Operators.LogicalNotUserDefined<T,U> lnud)
<T extends Comparable<T>> Boolean	visit(Operators.Lt<T> lt)
<T extends Comparable<T>> Boolean	visit(Operators.LtEq<T> ltEq)
Boolean	visit(Operators.Not not)
<T extends Comparable<T>> Boolean	visit(Operators.NotEq<T> notEq)
Boolean	visit(Operators.Or or)
<T extends Comparable<T>,U extends UserDefinedPredicate<T>> Boolean	visit(Operators.UserDefined<T,U> ud)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

canDrop

public static boolean canDrop(FilterPredicate pred,
              List<ColumnChunkMetaData> columns)

visit

public <T extends Comparable<T>> Boolean visit(Operators.Eq<T> eq)

Specified by:

visit in interface FilterPredicate.Visitor<Boolean>

visit

public <T extends Comparable<T>> Boolean visit(Operators.NotEq<T> notEq)

Specified by:

visit in interface FilterPredicate.Visitor<Boolean>

visit

public <T extends Comparable<T>> Boolean visit(Operators.Lt<T> lt)

Specified by:

visit in interface FilterPredicate.Visitor<Boolean>

visit

public <T extends Comparable<T>> Boolean visit(Operators.LtEq<T> ltEq)

Specified by:

visit in interface FilterPredicate.Visitor<Boolean>

visit

public <T extends Comparable<T>> Boolean visit(Operators.Gt<T> gt)

Specified by:

visit in interface FilterPredicate.Visitor<Boolean>

visit

public <T extends Comparable<T>> Boolean visit(Operators.GtEq<T> gtEq)

Specified by:

visit in interface FilterPredicate.Visitor<Boolean>

visit

public Boolean visit(Operators.And and)

Specified by:

visit in interface FilterPredicate.Visitor<Boolean>

visit

public Boolean visit(Operators.Or or)

Specified by:

visit in interface FilterPredicate.Visitor<Boolean>

visit

public Boolean visit(Operators.Not not)

Specified by:

visit in interface FilterPredicate.Visitor<Boolean>

visit

public <T extends Comparable<T>,U extends UserDefinedPredicate<T>> Boolean visit(Operators.UserDefined<T,U> ud)

Specified by:

visit in interface FilterPredicate.Visitor<Boolean>

visit

public <T extends Comparable<T>,U extends UserDefinedPredicate<T>> Boolean visit(Operators.LogicalNotUserDefined<T,U> lnud)

Specified by:

visit in interface FilterPredicate.Visitor<Boolean>