org.apache.flink.table.runtime.operators.rank

类 ComparableRecordComparator

java.lang.Object

org.apache.flink.table.runtime.operators.rank.ComparableRecordComparator

所有已实现的接口:

Serializable, Comparator<org.apache.flink.table.data.RowData>, RecordComparator

public final class ComparableRecordComparator
extends Object
implements RecordComparator

Because it's impossible to restore a RecordComparator instance generated by GeneratedRecordComparator from checkpoint snapshot. Hence, we introduce ComparableRecordComparator class to wrap the GeneratedRecordComparator. A ComparableRecordComparator instance is serializable and can restore the RecordComparator from the serialized ComparableRecordComparator. Besides, the equals(Object) doesn't take GeneratedRecordComparator into account, because the code is not deterministic across different client. Therefore, equals(Object) only compares the meta information used for generating code of RecordComparator.

Note: currently, this class is only used for RetractableTopNFunction.

另请参阅:

RetractableTopNFunction, 序列化表格

构造器概要

构造器

构造器和说明
ComparableRecordComparator(GeneratedRecordComparator generatedRecordComparator, int[] compareKeyPositions, org.apache.flink.table.types.logical.LogicalType[] compareKeyTypes, boolean[] compareOrders, boolean[] nullsIsLast)

方法概要

限定符和类型	方法和说明
int	compare(org.apache.flink.table.data.RowData o1, org.apache.flink.table.data.RowData o2)
boolean	equals(Object o)
GeneratedRecordComparator	getGeneratedRecordComparator()
int	hashCode()

从类继承的方法 java.lang.Object

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

从接口继承的方法 java.util.Comparator

comparing, comparing, comparingDouble, comparingInt, comparingLong, naturalOrder, nullsFirst, nullsLast, reversed, reverseOrder, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

构造器详细资料

ComparableRecordComparator

public ComparableRecordComparator(GeneratedRecordComparator generatedRecordComparator,
                                  int[] compareKeyPositions,
                                  org.apache.flink.table.types.logical.LogicalType[] compareKeyTypes,
                                  boolean[] compareOrders,
                                  boolean[] nullsIsLast)

方法详细资料

getGeneratedRecordComparator

public GeneratedRecordComparator getGeneratedRecordComparator()

compare

public int compare(org.apache.flink.table.data.RowData o1,
                   org.apache.flink.table.data.RowData o2)

指定者:

compare 在接口中 Comparator<org.apache.flink.table.data.RowData>

指定者:

compare 在接口中 RecordComparator

hashCode

public int hashCode()

覆盖:

hashCode 在类中 Object

equals

public boolean equals(Object o)

指定者:

equals 在接口中 Comparator<org.apache.flink.table.data.RowData>

覆盖:

equals 在类中 Object