BuiltInMetadata.CumulativeCost (Apache Calcite API)

All Superinterfaces:

Metadata

Enclosing class:

BuiltInMetadata
```
public static interface BuiltInMetadata.CumulativeCost
extends Metadata
```
Metadata about the cost of evaluating a relational expression, including all of its inputs.

Nested Class Summary

Nested Classes
Modifier and Type Interface Description

static interface BuiltInMetadata.CumulativeCost.Handler
Handler API.

Field Summary

Fields
Modifier and Type Field Description

static MetadataDef<BuiltInMetadata.CumulativeCost> DEF

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`RelOptCost`	`getCumulativeCost()`	Estimates the cost of executing a relational expression, including the cost of its inputs.

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

- Field Detail
  - DEF
```
static final MetadataDef<BuiltInMetadata.CumulativeCost> DEF
```
- Method Detail
  - getCumulativeCost
```
RelOptCost getCumulativeCost()
```
    Estimates the cost of executing a relational expression, including the cost of its inputs. The default implementation for this query adds BuiltInMetadata.NonCumulativeCost.getNonCumulativeCost() to the cumulative cost of each input, but metadata providers can override this with their own cost models, e.g. to take into account interactions between expressions.
    
    Returns:
    
    estimated cost, or null if no reliable estimate can be determined