Package org.apache.calcite.rel.metadata

Interface BuiltInMetadata.Measure

All Superinterfaces:

Metadata

Enclosing class:

BuiltInMetadata

public static interface BuiltInMetadata.Measure
extends Metadata

Metadata about whether a column is a measure and, if so, what is the expression to evaluate that measure in the current context.

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static interface	BuiltInMetadata.Measure.Context	Context for a use of a measure at a call site.
static interface	BuiltInMetadata.Measure.Handler	Handler API.

Field Summary

Fields

Modifier and Type	Field	Description
static final MetadataDef<BuiltInMetadata.Measure>	DEF

Method Summary

Modifier and Type	Method	Description
RexNode	expand(int column, BuiltInMetadata.Measure.Context context)	Expands a measure to an expression.
Boolean	isMeasure(int column)	Returns whether a given column is a measure.

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

rel

Field Details

DEF

static final MetadataDef<BuiltInMetadata.Measure> DEF

Method Details

isMeasure

Boolean isMeasure(int column)

Returns whether a given column is a measure.

Parameters:

column - Column ordinal (0-based)

expand

RexNode expand(int column,
 BuiltInMetadata.Measure.Context context)

Expands a measure to an expression.

Parameters:

column - Column ordinal (0-based)

context - Evaluation context