Record Class QueryOptimizer.TableStatistics

java.lang.Object

java.lang.Record

com.loomcache.server.query.QueryOptimizer.TableStatistics

Enclosing class:

QueryOptimizer

public static record QueryOptimizer.TableStatistics(long rowCount, Map<String,Integer> distinctValues, Map<String, Comparable<?>> minValues, Map<String, Comparable<?>> maxValues)
extends Record

Table statistics for cost estimation.

Constructor Summary

Constructors

Constructor	Description
TableStatistics(long rowCount, Map<String,Integer> distinctValues, Map<String, Comparable<?>> minValues, Map<String, Comparable<?>> maxValues)	Creates an instance of a TableStatistics record class.

Method Summary

Modifier and Type	Method	Description
Map<String,Integer>	distinctValues()	Returns the value of the distinctValues record component.
final boolean	equals(Object o)	Indicates whether some other object is "equal to" this one.
final int	hashCode()	Returns a hash code value for this object.
Map<String, Comparable<?>>	maxValues()	Returns the value of the maxValues record component.
Map<String, Comparable<?>>	minValues()	Returns the value of the minValues record component.
long	rowCount()	Returns the value of the rowCount record component.
final String	toString()	Returns a string representation of this record class.

Methods inherited from class Object

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

Constructor Details

TableStatistics

public TableStatistics(long rowCount,
 Map<String,Integer> distinctValues,
 Map<String, Comparable<?>> minValues,
 Map<String, Comparable<?>> maxValues)

Creates an instance of a TableStatistics record class.

Parameters:

rowCount - the value for the rowCount record component

distinctValues - the value for the distinctValues record component

minValues - the value for the minValues record component

maxValues - the value for the maxValues record component

Method Details

toString

public final String toString()

Returns a string representation of this record class. The representation contains the name of the class, followed by the name and value of each of the record components.

Specified by:

toString in class Record

Returns:

a string representation of this object

hashCode

public final int hashCode()

Returns a hash code value for this object. The value is derived from the hash code of each of the record components.

Specified by:

hashCode in class Record

Returns:

a hash code value for this object

equals

public final boolean equals(Object o)

Indicates whether some other object is "equal to" this one. The objects are equal if the other object is of the same class and if all the record components are equal. Reference components are compared with Objects::equals(Object,Object); primitive components are compared with the compare method from their corresponding wrapper classes.

Specified by:

equals in class Record

Parameters:

o - the object with which to compare

Returns:

true if this object is the same as the o argument; false otherwise.

rowCount

public long rowCount()

Returns the value of the rowCount record component.

Returns:

the value of the rowCount record component

distinctValues

public Map<String,Integer> distinctValues()

Returns the value of the distinctValues record component.

Returns:

the value of the distinctValues record component

minValues

public Map<String, Comparable<?>> minValues()

Returns the value of the minValues record component.

Returns:

the value of the minValues record component

maxValues

public Map<String, Comparable<?>> maxValues()

Returns the value of the maxValues record component.

Returns:

the value of the maxValues record component