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

Interface HiveRemoveEmptySingleRules.JoinLeftEmptyRuleConfig

All Superinterfaces:

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

Enclosing class:

HiveRemoveEmptySingleRules

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

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

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