BuiltInMetadata.PercentageOriginalRows (Apache Calcite API)

All Superinterfaces:

Metadata

All Known Subinterfaces:

BuiltInMetadata.All

Enclosing class:

BuiltInMetadata
```
public static interface BuiltInMetadata.PercentageOriginalRows
extends Metadata
```
Metadata about the proportion of original rows that remain in a relational expression.

Nested Class Summary

Nested Classes
Modifier and Type Interface Description

static interface BuiltInMetadata.PercentageOriginalRows.Handler
Handler API.

Field Summary

Fields
Modifier and Type Field Description

static MetadataDef<BuiltInMetadata.PercentageOriginalRows> DEF

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`java.lang.Double`	`getPercentageOriginalRows()`	Estimates the percentage of the number of rows actually produced by a relational expression out of the number of rows it would produce if all single-table filter conditions were removed.

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

- Field Detail
  - DEF
```
static final MetadataDef<BuiltInMetadata.PercentageOriginalRows> DEF
```
- Method Detail
  - getPercentageOriginalRows
```
java.lang.Double getPercentageOriginalRows()
```
    Estimates the percentage of the number of rows actually produced by a relational expression out of the number of rows it would produce if all single-table filter conditions were removed.
    
    Returns:
    
    estimated percentage (between 0.0 and 1.0), or null if no reliable estimate can be determined