Package org.apache.druid.sql.calcite.rel

Class Projection

java.lang.Object

org.apache.druid.sql.calcite.rel.Projection

public class Projection
extends Object

Used to represent projections (Calcite "Project"). These are embedded in Sorting and Grouping to store post-sorting and post-grouping projections, as well as directly in DruidQuery to store potential post-selection projections. They may be built using either virtual columns (pre-aggregation) or post-aggregators. It is expected that callers will create and use Projection instances in the same context (pre- or post-aggregation). If this isn't done properly (i.e. a caller creates a pre-aggregation Projection but then calls getPostAggregators() then an exception will be thrown.

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object o)
RowSignature	getOutputRowSignature()
List<PostAggregator>	getPostAggregators()
List<String>	getVirtualColumns()
int	hashCode()
static Projection	postAggregation(org.apache.calcite.rel.core.Project project, PlannerContext plannerContext, RowSignature inputRowSignature, String basePrefix)
static Projection	preAggregation(org.apache.calcite.rel.core.Project project, PlannerContext plannerContext, RowSignature inputRowSignature, VirtualColumnRegistry virtualColumnRegistry)
String	toString()

Methods inherited from class java.lang.Object

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

Method Details

postAggregation

public static Projection postAggregation(org.apache.calcite.rel.core.Project project,
 PlannerContext plannerContext,
 RowSignature inputRowSignature,
 String basePrefix)

preAggregation

public static Projection preAggregation(org.apache.calcite.rel.core.Project project,
 PlannerContext plannerContext,
 RowSignature inputRowSignature,
 VirtualColumnRegistry virtualColumnRegistry)

getPostAggregators

public List<PostAggregator> getPostAggregators()

getVirtualColumns

public List<String> getVirtualColumns()

getOutputRowSignature

public RowSignature getOutputRowSignature()

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