org.apache.flink.table.planner.plan.metadata

接口 FlinkMetadata.UniqueGroups

所有超级接口:

org.apache.calcite.rel.metadata.Metadata

封闭类:

FlinkMetadata

public static interface FlinkMetadata.UniqueGroups
extends org.apache.calcite.rel.metadata.Metadata

Metadata about the (minimum) unique groups of the given columns from a specified relational expression.

嵌套类概要

嵌套类

限定符和类型	接口和说明
static interface	FlinkMetadata.UniqueGroups.Handler Handler API.

字段概要

字段

限定符和类型	字段和说明
static org.apache.calcite.rel.metadata.MetadataDef<FlinkMetadata.UniqueGroups>	DEF
static Method	METHOD

方法概要

限定符和类型	方法和说明
org.apache.calcite.util.ImmutableBitSet	getUniqueGroups(org.apache.calcite.util.ImmutableBitSet columns) Returns the (minimum) unique groups of the given columns from a specified relational expression.

从接口继承的方法 org.apache.calcite.rel.metadata.Metadata

rel

字段详细资料

METHOD

static final Method METHOD

DEF

static final org.apache.calcite.rel.metadata.MetadataDef<FlinkMetadata.UniqueGroups> DEF

方法详细资料

getUniqueGroups

org.apache.calcite.util.ImmutableBitSet getUniqueGroups(org.apache.calcite.util.ImmutableBitSet columns)

Returns the (minimum) unique groups of the given columns from a specified relational expression.

参数:

columns - the given columns in a specified relational expression. The given columns should not be null.

返回:

the (minimum) unique columns which should be a sub-collection of the given columns, and should not be null or empty. If none unique columns can be found, return the given columns.