接口的使用
org.apache.flink.table.runtime.keyselector.RowDataKeySelector

使用RowDataKeySelector的程序包

程序包	说明
org.apache.flink.table.runtime.keyselector
org.apache.flink.table.runtime.operators.rank

org.apache.flink.table.runtime.keyselector中RowDataKeySelector的使用

实现RowDataKeySelector的org.apache.flink.table.runtime.keyselector中的类

限定符和类型	类和说明
class	BinaryRowDataKeySelector A KeySelector which will extract key from RowData.
class	EmptyRowDataKeySelector A utility class which key is always empty no matter what the input row is.

org.apache.flink.table.runtime.operators.rank中RowDataKeySelector的使用

参数类型为RowDataKeySelector的org.apache.flink.table.runtime.operators.rank中的构造器

构造器和说明
AppendOnlyTopNFunction(long minRetentionTime, long maxRetentionTime, RowDataTypeInfo inputRowType, GeneratedRecordComparator sortKeyGeneratedRecordComparator, RowDataKeySelector sortKeySelector, RankType rankType, RankRange rankRange, boolean generateUpdateBefore, boolean outputRankNumber, long cacheSize)
RetractableTopNFunction(long minRetentionTime, long maxRetentionTime, RowDataTypeInfo inputRowType, GeneratedRecordComparator generatedRecordComparator, RowDataKeySelector sortKeySelector, RankType rankType, RankRange rankRange, GeneratedRecordEqualiser generatedEqualiser, boolean generateUpdateBefore, boolean outputRankNumber)
UpdatableTopNFunction(long minRetentionTime, long maxRetentionTime, RowDataTypeInfo inputRowType, RowDataKeySelector rowKeySelector, GeneratedRecordComparator generatedRecordComparator, RowDataKeySelector sortKeySelector, RankType rankType, RankRange rankRange, boolean generateUpdateBefore, boolean outputRankNumber, long cacheSize)