Package org.apache.druid.sql.calcite.expression

Class SimpleExtraction

java.lang.Object

org.apache.druid.sql.calcite.expression.SimpleExtraction

public class SimpleExtraction
extends Object

Represents a "simple" extraction of a value from a Druid row, which is defined as a column plus an optional extractionFn. This is useful since identifying simple extractions and treating them specially can allow Druid to perform additional optimizations.

Method Summary

Modifier and Type	Method	Description
SimpleExtraction	cascade(ExtractionFn nextExtractionFn)	Create a new instance where the provided ExtractionFn is composed with the existing ExtractionFn of this instance.
boolean	equals(Object o)
String	getColumn()
ExtractionFn	getExtractionFn()
int	hashCode()
static SimpleExtraction	of(String column, ExtractionFn extractionFn)	Create an instance.
DimensionSpec	toDimensionSpec(String outputName, ColumnType outputType)
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Method Details

of

public static SimpleExtraction of(String column,
 @Nullable
 ExtractionFn extractionFn)

Create an instance.

Parameters:

column - column

extractionFn - extraction fn, if any. Callers should only provide a function if PlannerContext.isUseExtractionFns() is true.

getColumn

public String getColumn()

getExtractionFn

@Nullable
public ExtractionFn getExtractionFn()

cascade

public SimpleExtraction cascade(ExtractionFn nextExtractionFn)

Create a new instance where the provided ExtractionFn is composed with the existing ExtractionFn of this instance. Callers should only use this method if PlannerContext.isUseExtractionFns() is true.

toDimensionSpec

public DimensionSpec toDimensionSpec(String outputName,
 ColumnType outputType)

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object