io.druid.sql.calcite.rule

Class SortCollapseRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

io.druid.sql.calcite.rule.SortCollapseRule

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

Collapses two adjacent Sort operations together. Useful for queries like SELECT * FROM (SELECT DISTINCT dim2 FROM druid.foo ORDER BY dim2) LIMIT 10.

Field Summary

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

description, operands, relBuilderFactory

Constructor Summary

Constructors

Constructor and Description
SortCollapseRule()

Method Summary

Modifier and Type	Method and Description
static SortCollapseRule	instance()
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

Constructor Detail

SortCollapseRule

public SortCollapseRule()

Method Detail

instance

public static SortCollapseRule instance()

onMatch

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

Specified by:

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