ExpressionTransformer (Pinot local segment implementations 0.12.1 API)

java.lang.Object
- org.apache.pinot.segment.local.recordtransformer.ExpressionTransformer

All Implemented Interfaces:

Serializable, RecordTransformer
```
public class ExpressionTransformer
extends Object
implements RecordTransformer
```
The ExpressionTransformer class will evaluate the function expressions.
NOTE: should put this before the DataTypeTransformer. After this, transformed column can be treated as regular column for other record transformers.

See Also:

Serialized Form

Constructor Summary

Constructors
Constructor Description

ExpressionTransformer(TableConfig tableConfig, Schema schema)

Method Summary

Modifier and Type	Method	Description
`boolean`	`isNoOp()`	Returns `true` if the transformer is no-op (can be skipped), `false` otherwise.
`GenericRow`	`transform(GenericRow record)`	Transforms a record based on some custom rules.

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

- Constructor Detail
  - ExpressionTransformer
```
public ExpressionTransformer(TableConfig tableConfig,
                             Schema schema)
```
- Method Detail
  - isNoOp
```
public boolean isNoOp()
```
    Description copied from interface: RecordTransformer
    
    Returns true if the transformer is no-op (can be skipped), false otherwise.
    
    Specified by:
    
    isNoOp in interface RecordTransformer
  - transform
```
public GenericRow transform(GenericRow record)
```
    Description copied from interface: RecordTransformer
    
    Transforms a record based on some custom rules.
    
    Specified by:
    
    transform in interface RecordTransformer
    
    Parameters:
    
    record - Record to transform
    
    Returns:
    
    Transformed record, or null if the record does not follow certain rules.