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

Class HiveReduceExpressionsRule

java.lang.Object

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

public final class HiveReduceExpressionsRule
extends Object

Collection of planner rules that apply various simplifying transformations on RexNode trees. Currently, there are two transformations:

• Constant reduction, which evaluates constant subtrees, replacing them with a corresponding RexLiteral
• Removal of redundant casts, which occurs when the argument into the cast is the same as the type of the resulting cast expression

Field Summary

Fields

Modifier and Type	Field and Description
static org.apache.calcite.plan.RelOptRule	FILTER_INSTANCE Singleton rule that reduces constants inside a HiveFilter.
static org.apache.calcite.plan.RelOptRule	JOIN_INSTANCE Singleton rule that reduces constants inside a HiveJoin.
static org.apache.calcite.plan.RelOptRule	PROJECT_INSTANCE Singleton rule that reduces constants inside a HiveProject.
static org.apache.calcite.plan.RelOptRule	SEMIJOIN_INSTANCE Singleton rule that reduces constants inside a HiveSemiJoin.

Method Summary

Methods inherited from class java.lang.Object

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

Field Detail

FILTER_INSTANCE

public static final org.apache.calcite.plan.RelOptRule FILTER_INSTANCE

Singleton rule that reduces constants inside a HiveFilter.

PROJECT_INSTANCE

public static final org.apache.calcite.plan.RelOptRule PROJECT_INSTANCE

Singleton rule that reduces constants inside a HiveProject.

JOIN_INSTANCE

public static final org.apache.calcite.plan.RelOptRule JOIN_INSTANCE

Singleton rule that reduces constants inside a HiveJoin.

SEMIJOIN_INSTANCE

public static final org.apache.calcite.plan.RelOptRule SEMIJOIN_INSTANCE

Singleton rule that reduces constants inside a HiveSemiJoin.