NullPolicy (Calcite Core 1.16.0 API)

java.lang.Object
- java.lang.Enum<NullPolicy>
- - org.apache.calcite.adapter.enumerable.NullPolicy

All Implemented Interfaces:

Serializable, Comparable<NullPolicy>
```
public enum NullPolicy
extends Enum<NullPolicy>
```
Describes when a function/operator will return null.
STRICT and ANY are similar. STRICT says f(a0, a1) will NEVER return null if a0 and a1 are not null. This means that we can check whether f returns null just by checking its arguments. Use STRICT in preference to ANY whenever possible.

Enum Constant Summary

Enum Constants
Enum Constant and Description
`AND` If any of the arguments are false, result is false; else if any arguments are null, result is null; else true.
`ANY` If any of the arguments are null, return null.
`NONE`
`NOT` If any argument is true, result is false; else if any argument is null, result is null; else true.
`OR` If any of the arguments are true, result is true; else if any arguments are null, result is null; else false.
`SEMI_STRICT` Returns null if one of the arguments is null, and possibly other times.
`STRICT` Returns null if and only if one of the arguments are null.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static NullPolicy`	`valueOf(String name)` Returns the enum constant of this type with the specified name.
`static NullPolicy[]`	`values()` Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum
clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object
getClass, notify, notifyAll, wait, wait, wait

- Enum Constant Detail
  - STRICT
```
public static final NullPolicy STRICT
```
    Returns null if and only if one of the arguments are null.
  - SEMI_STRICT
```
public static final NullPolicy SEMI_STRICT
```
    Returns null if one of the arguments is null, and possibly other times.
  - ANY
```
public static final NullPolicy ANY
```
    If any of the arguments are null, return null.
  - AND
```
public static final NullPolicy AND
```
    If any of the arguments are false, result is false; else if any arguments are null, result is null; else true.
  - OR
```
public static final NullPolicy OR
```
    If any of the arguments are true, result is true; else if any arguments are null, result is null; else false.
  - NOT
```
public static final NullPolicy NOT
```
    If any argument is true, result is false; else if any argument is null, result is null; else true.
  - NONE
```
public static final NullPolicy NONE
```
- Method Detail
  - values
```
public static NullPolicy[] values()
```
    Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:
```
for (NullPolicy c : NullPolicy.values())
    System.out.println(c);
```
    Returns:
    
    an array containing the constants of this enum type, in the order they are declared
  - valueOf
```
public static NullPolicy valueOf(String name)
```
    Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
    
    Parameters:
    
    name - the name of the enum constant to be returned.
    
    Returns:
    
    the enum constant with the specified name
    
    Throws:
    
    IllegalArgumentException - if this enum type has no constant with the specified name
    
    NullPointerException - if the argument is null

Enum NullPolicy

Enum Constant Summary

Method Summary

Methods inherited from class java.lang.Enum

Methods inherited from class java.lang.Object

Enum Constant Detail

STRICT

SEMI_STRICT

ANY

AND

OR

NOT

NONE

Method Detail

values

valueOf