org.apache.hadoop.hive.ql.optimizer.calcite.rules

Interface HiveRemoveEmptySingleRules.JoinRightEmptyRuleConfig

All Superinterfaces:

org.apache.calcite.rel.rules.PruneEmptyRules.PruneEmptyRule.Config, org.apache.calcite.plan.RelRule.Config

Enclosing class:

HiveRemoveEmptySingleRules

public static interface HiveRemoveEmptySingleRules.JoinRightEmptyRuleConfig
extends org.apache.calcite.rel.rules.PruneEmptyRules.PruneEmptyRule.Config

Improved version of Calcite's PruneEmptyRules.JoinRightEmptyRuleConfig. In case of left outer join if the right branch is empty the join operator can be removed and take the left branch only. select * from emp right join (select * from dept where 1=0) to select emp.*, null as dept.col0 ... null as dept.coln from emp

Field Summary

Fields inherited from interface org.apache.calcite.plan.RelRule.Config

EMPTY

Method Summary

Modifier and Type	Method and Description
default org.apache.calcite.rel.rules.PruneEmptyRules.PruneEmptyRule	toRule()

Methods inherited from interface org.apache.calcite.plan.RelRule.Config

as, description, operandSupplier, relBuilderFactory, withDescription, withOperandSupplier, withRelBuilderFactory

Method Detail

toRule

default org.apache.calcite.rel.rules.PruneEmptyRules.PruneEmptyRule toRule()

Specified by:

toRule in interface org.apache.calcite.rel.rules.PruneEmptyRules.PruneEmptyRule.Config

Specified by:

toRule in interface org.apache.calcite.plan.RelRule.Config