ExpressionProcessing (druid-processing 28.0.0 API)

java.lang.Object
- org.apache.druid.math.expr.ExpressionProcessing

```
public class ExpressionProcessing
extends Object
```
Like NullHandling, except for expressions processing configs

Constructor Summary

Constructors
Constructor Description

ExpressionProcessing()

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static void`	`initializeForHomogenizeNullMultiValueStrings()`
`static void`	`initializeForStrictBooleansTests(boolean useStrict)`
`static void`	`initializeForTests()`	Many unit tests do not setup modules for this value to be injected, this method provides a manual way to initialize `INSTANCE`
`static boolean`	`isHomogenizeNullMultiValueStringArrays()`	All multi-value string expression input values of 'null', '[]', and '[null]' will be coerced to '[null]'.
`static boolean`	`processArraysAsMultiValueStrings()`	All `ExprType.ARRAY` values will be converted to `ExpressionType.STRING` by their column selectors (not within expression processing) to be treated as multi-value strings instead of native arrays.
`static boolean`	`useStrictBooleans()`	All boolean expressions are `ExpressionType.LONG`

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

- Constructor Detail
  - ExpressionProcessing
```
public ExpressionProcessing()
```
- Method Detail
  - initializeForTests
```
public static void initializeForTests()
```
    Many unit tests do not setup modules for this value to be injected, this method provides a manual way to initialize INSTANCE
  - initializeForStrictBooleansTests
```
public static void initializeForStrictBooleansTests(boolean useStrict)
```
  - initializeForHomogenizeNullMultiValueStrings
```
public static void initializeForHomogenizeNullMultiValueStrings()
```
  - useStrictBooleans
```
public static boolean useStrictBooleans()
```
    All boolean expressions are ExpressionType.LONG
  - processArraysAsMultiValueStrings
```
public static boolean processArraysAsMultiValueStrings()
```
    All ExprType.ARRAY values will be converted to ExpressionType.STRING by their column selectors (not within expression processing) to be treated as multi-value strings instead of native arrays.
  - isHomogenizeNullMultiValueStringArrays
```
public static boolean isHomogenizeNullMultiValueStringArrays()
```
    All multi-value string expression input values of 'null', '[]', and '[null]' will be coerced to '[null]'. If false, (the default) this will only be done when single value expressions are implicitly mapped across multi-value rows, so that the single valued expression will always be evaluated with an input value of 'null'