BuiltInMetadata.MaxRowCount (Apache Calcite API)

All Superinterfaces:

Metadata

Enclosing class:

BuiltInMetadata
```
public static interface BuiltInMetadata.MaxRowCount
extends Metadata
```
Metadata about the maximum number of rows returned by a relational expression.

Nested Class Summary

Nested Classes
Modifier and Type Interface Description

static interface BuiltInMetadata.MaxRowCount.Handler
Handler API.

Field Summary

Fields
Modifier and Type Field Description

static MetadataDef<BuiltInMetadata.MaxRowCount> DEF

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`java.lang.Double`	`getMaxRowCount()`	Estimates the max number of rows which will be returned by a relational expression.

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

- Field Detail
  - DEF
```
static final MetadataDef<BuiltInMetadata.MaxRowCount> DEF
```
- Method Detail
  - getMaxRowCount
```
java.lang.Double getMaxRowCount()
```
    Estimates the max number of rows which will be returned by a relational expression.
    The default implementation for this query returns Double.POSITIVE_INFINITY, but metadata providers can override this with their own cost models.
    
    Returns:
    
    upper bound on the number of rows returned