org.apache.druid.segment.join.filter

Class JoinFilterColumnCorrelationAnalysis

java.lang.Object

org.apache.druid.segment.join.filter.JoinFilterColumnCorrelationAnalysis

public class JoinFilterColumnCorrelationAnalysis
extends Object

Represents an analysis of what base table columns, if any, can be correlated with a column that will be filtered on.

For example, if we're joining on a base table via the equiconditions (id = j.id AND f(id2) = j.id2), then we can correlate j.id with id (base table column) and j.id2 with f(id2) (a base table expression).

Constructor Summary

Constructors

Constructor and Description
JoinFilterColumnCorrelationAnalysis(String joinColumn, Set<String> baseColumns, Set<Expr> baseExpressions)

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o)
List<String>	getBaseColumns()
List<Expr>	getBaseExpressions()
Map<Pair<String,String>,Optional<Set<String>>>	getCorrelatedValuesMap()
String	getJoinColumn()
int	hashCode()
boolean	supportsPushDown()

Methods inherited from class java.lang.Object

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

Constructor Detail

JoinFilterColumnCorrelationAnalysis

public JoinFilterColumnCorrelationAnalysis(String joinColumn,
                                           Set<String> baseColumns,
                                           Set<Expr> baseExpressions)

Method Detail

getJoinColumn

public String getJoinColumn()

getBaseColumns

@Nonnull
public List<String> getBaseColumns()

getBaseExpressions

@Nonnull
public List<Expr> getBaseExpressions()

getCorrelatedValuesMap

public Map<Pair<String,String>,Optional<Set<String>>> getCorrelatedValuesMap()

supportsPushDown

public boolean supportsPushDown()

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object