NodeStats (sql 2.71.0 API)

java.lang.Object
- org.apache.beam.sdk.extensions.sql.impl.planner.NodeStats

```
public abstract class NodeStats
extends java.lang.Object
```
This is a utility class to represent rowCount, rate and window.

Field Summary

Fields
Modifier and Type Field Description

static NodeStats UNKNOWN
Returns an instance with all values set to INFINITY.

Constructor Summary

Constructors
Constructor Description

NodeStats()

Method Summary

All Methods Static Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`static NodeStats`	`create(double rowCount)`	It creates an instance with rate=0 and window=rowCount for bounded sources.
`static NodeStats`	`create(double rowCount, double rate, double window)`
`abstract double`	`getRate()`
`abstract double`	`getRowCount()`
`abstract double`	`getWindow()`	This method returns the number of tuples in each window.
`boolean`	`isUnknown()`	If any of the values for rowCount, rate or window is infinite, it returns true.
`NodeStats`	`minus(NodeStats that)`
`NodeStats`	`multiply(double factor)`
`NodeStats`	`plus(NodeStats that)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - UNKNOWN
```
public static final NodeStats UNKNOWN
```
    Returns an instance with all values set to INFINITY. This will be only used when the node is not a BeamRelNode and we don't have an estimation implementation for it in the metadata handler. In this case we return INFINITE and it will be propagated up in the estimates.
- Constructor Detail
  - NodeStats
```
public NodeStats()
```
- Method Detail
  - getRowCount
```
public abstract double getRowCount()
```
  - getRate
```
public abstract double getRate()
```
  - getWindow
```
public abstract double getWindow()
```
    This method returns the number of tuples in each window. It is different than the windowing notion of Beam.
  - create
```
public static NodeStats create(double rowCount,
                               double rate,
                               double window)
```
  - create
```
public static NodeStats create(double rowCount)
```
    It creates an instance with rate=0 and window=rowCount for bounded sources.
  - isUnknown
```
public boolean isUnknown()
```
    If any of the values for rowCount, rate or window is infinite, it returns true.
  - multiply
```
public NodeStats multiply(double factor)
```
  - plus
```
public NodeStats plus(NodeStats that)
```
  - minus
```
public NodeStats minus(NodeStats that)
```