org.apache.kylin.query.optrule

Class AggregateMultipleExpandRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

org.apache.kylin.query.optrule.AggregateMultipleExpandRule

public class AggregateMultipleExpandRule
extends org.apache.calcite.plan.RelOptRule

Supoort grouping query. Expand the non-simple aggregate to more than one simple aggregates. Add project on expanded simple aggregate to add indicators of origin aggregate. All projects on aggregate added into one union, which replace the origin aggregate. The new aggregates will be transformed by AggregateProjectReduceRule, to reduce rolled up dimensions. In case to scan other cuboid data without the rolled up dimensions.

Examples:

Origin Aggregate: group by grouping sets ((dim A, dim B, dim C), (dim A, dim C), (dim B, dim C))

Transformed Union: select dim A, dim B, dim C, 0, 0, 0 union all select dim A, null, dim C, 0, 1, 0 union all select null, dim B, dim C, 1, 0, 0

Field Summary

Fields

Modifier and Type	Field and Description
static AggregateMultipleExpandRule	INSTANCE

Fields inherited from class org.apache.calcite.plan.RelOptRule

description, operands, relBuilderFactory

Method Summary

Methods

Modifier and Type	Method and Description
void	onMatch(org.apache.calcite.plan.RelOptRuleCall call)

Methods inherited from class org.apache.calcite.plan.RelOptRule

any, convert, convert, convertList, convertOperand, equals, equals, getOperand, getOperands, getOutConvention, getOutTrait, hashCode, matches, none, operand, operand, operand, operand, operand, some, toString, unordered

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final AggregateMultipleExpandRule INSTANCE

Method Detail

onMatch

public void onMatch(org.apache.calcite.plan.RelOptRuleCall call)

Specified by:

onMatch in class org.apache.calcite.plan.RelOptRule