FunctionEvaluatorFactory (Pinot local segment implementations 1.0.0 API)

java.lang.Object
- org.apache.pinot.segment.local.function.FunctionEvaluatorFactory

```
public class FunctionEvaluatorFactory
extends Object
```
Factory class to create an FunctionEvaluator for the field spec based on the FieldSpec.getTransformFunction()

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static FunctionEvaluator`	`getExpressionEvaluator(String transformExpression)`
`static FunctionEvaluator`	`getExpressionEvaluator(FieldSpec fieldSpec)`	Creates the `FunctionEvaluator` for the given field spec 1.
`static boolean`	`isGroovyExpression(String transformExpression)`

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

- Method Detail
  - getExpressionEvaluator
```
@Nullable
public static FunctionEvaluator getExpressionEvaluator(FieldSpec fieldSpec)
```
    Creates the FunctionEvaluator for the given field spec 1. If transform expression is defined, use it to create the appropriate FunctionEvaluator 2. For TIME column, if conversion is needed, TimeSpecFunctionEvaluator for backward compatible handling of time spec. This is needed until we migrate to DateTimeFieldSpec 3. For columns ending with __KEYS or __VALUES (used for interpreting Map column in Avro), create default groovy functions for handing the Map 4. Return null, if none of the above
  - getExpressionEvaluator
```
public static FunctionEvaluator getExpressionEvaluator(String transformExpression)
```
  - isGroovyExpression
```
public static boolean isGroovyExpression(String transformExpression)
```
    Returns:
    
    true if the given transform function is a groovy expression, otherwise returns false