org.apache.druid.sql.calcite.aggregation.builtin

Class SimpleSqlAggregator

java.lang.Object

org.apache.druid.sql.calcite.aggregation.builtin.SimpleSqlAggregator

All Implemented Interfaces:

SqlAggregator

Direct Known Subclasses:

AvgSqlAggregator, MaxSqlAggregator, MinSqlAggregator, SumSqlAggregator

public abstract class SimpleSqlAggregator
extends Object
implements SqlAggregator

Abstraction for single column, single argument simple aggregators like sum, avg, min, max

Constructor Summary

Constructors

Constructor and Description
SimpleSqlAggregator()

Method Summary

Modifier and Type

Method and Description

Aggregation

toDruidAggregation(PlannerContext plannerContext, RowSignature rowSignature, VirtualColumnRegistry virtualColumnRegistry, org.apache.calcite.rex.RexBuilder rexBuilder, String name, org.apache.calcite.rel.core.AggregateCall aggregateCall, org.apache.calcite.rel.core.Project project, List<Aggregation> existingAggregations, boolean finalizeAggregations) Returns a Druid Aggregation corresponding to a SQL AggregateCall.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.druid.sql.calcite.aggregation.SqlAggregator

calciteFunction

Constructor Detail

SimpleSqlAggregator

public SimpleSqlAggregator()

Method Detail

toDruidAggregation

@Nullable
public Aggregation toDruidAggregation(PlannerContext plannerContext,
                                                RowSignature rowSignature,
                                                VirtualColumnRegistry virtualColumnRegistry,
                                                org.apache.calcite.rex.RexBuilder rexBuilder,
                                                String name,
                                                org.apache.calcite.rel.core.AggregateCall aggregateCall,
                                                org.apache.calcite.rel.core.Project project,
                                                List<Aggregation> existingAggregations,
                                                boolean finalizeAggregations)

Description copied from interface: SqlAggregator

Returns a Druid Aggregation corresponding to a SQL AggregateCall. This method should ignore filters; they will be applied to your aggregator in a later step.

Specified by:

toDruidAggregation in interface SqlAggregator

Parameters:

plannerContext - SQL planner context

rowSignature - input row signature

virtualColumnRegistry - re-usable virtual column references

rexBuilder - a rexBuilder, in case you need one

name - desired output name of the aggregation

aggregateCall - aggregate call object

project - project that should be applied before aggregation; may be null

existingAggregations - existing aggregations for this query; useful for re-using aggregations. May be safely ignored if you do not want to re-use existing aggregations.

finalizeAggregations - true if this query should include explicit finalization for all of its aggregators, where required. This is set for subqueries where Druid's native query layer does not do this automatically.

Returns:

aggregation, or null if the call cannot be translated