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

Interface FlinkMetadata.ColumnOriginNullCount

All Superinterfaces:

org.apache.calcite.rel.metadata.Metadata

Enclosing class:

FlinkMetadata

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

Origin null count, looking until source.

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static interface	FlinkMetadata.ColumnOriginNullCount.Handler Handler API.

Field Summary

Fields

Modifier and Type	Field and Description
static org.apache.calcite.rel.metadata.MetadataDef<FlinkMetadata.ColumnOriginNullCount>	DEF
static Method	METHOD

Method Summary

Modifier and Type	Method and Description
Double	getColumnOriginNullCount(int index) Returns origin null count of the given column from a specified relational expression.

Methods inherited from interface org.apache.calcite.rel.metadata.Metadata

rel

Field Detail

METHOD

static final Method METHOD

DEF

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

Method Detail

getColumnOriginNullCount

Double getColumnOriginNullCount(int index)

Returns origin null count of the given column from a specified relational expression.

Parameters:

index - the index of the given column in a specified relational expression

Returns:

origin null count of the given column if can be estimated, else return null.