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

Class HiveReduceExpressionsRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

org.apache.calcite.rel.rules.ReduceExpressionsRule

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

public abstract class HiveReduceExpressionsRule
extends org.apache.calcite.rel.rules.ReduceExpressionsRule

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

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	HiveReduceExpressionsRule.FilterReduceExpressionsRule Rule that reduces constants inside a Filter.

Nested classes/interfaces inherited from class org.apache.calcite.rel.rules.ReduceExpressionsRule

org.apache.calcite.rel.rules.ReduceExpressionsRule.CalcReduceExpressionsRule, org.apache.calcite.rel.rules.ReduceExpressionsRule.CaseShuttle, org.apache.calcite.rel.rules.ReduceExpressionsRule.JoinReduceExpressionsRule, org.apache.calcite.rel.rules.ReduceExpressionsRule.ProjectReduceExpressionsRule, org.apache.calcite.rel.rules.ReduceExpressionsRule.ReducibleExprLocator, org.apache.calcite.rel.rules.ReduceExpressionsRule.RexReplacer

Field Summary

Fields

Modifier and Type	Field and Description
static org.apache.calcite.rel.rules.ReduceExpressionsRule	FILTER_INSTANCE Singleton rule that reduces constants inside a HiveFilter.
static org.apache.calcite.rel.rules.ReduceExpressionsRule	JOIN_INSTANCE Singleton rule that reduces constants inside a HiveJoin.
protected static org.slf4j.Logger	LOG
static org.apache.calcite.rel.rules.ReduceExpressionsRule	PROJECT_INSTANCE Singleton rule that reduces constants inside a HiveProject.

Fields inherited from class org.apache.calcite.rel.rules.ReduceExpressionsRule

CALC_INSTANCE, EXCLUSION_PATTERN, matchNullability

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

description, operands, relBuilderFactory

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	HiveReduceExpressionsRule(Class<? extends org.apache.calcite.rel.RelNode> clazz, org.apache.calcite.tools.RelBuilderFactory relBuilderFactory, String desc) Creates a HiveReduceExpressionsRule.

Method Summary

Methods inherited from class org.apache.calcite.rel.rules.ReduceExpressionsRule

findReducibleExps, predicateConstants, pushPredicateIntoCase, reduceExpressions, reduceExpressions, reduceExpressions, reduceExpressionsInternal, substitute

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

any, convert, convert, convertList, convertOperand, equals, equals, getOperand, getOperands, getOutConvention, getOutTrait, hashCode, matches, none, onMatch, 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

LOG

protected static final org.slf4j.Logger LOG

FILTER_INSTANCE

public static final org.apache.calcite.rel.rules.ReduceExpressionsRule FILTER_INSTANCE

Singleton rule that reduces constants inside a HiveFilter.

PROJECT_INSTANCE

public static final org.apache.calcite.rel.rules.ReduceExpressionsRule PROJECT_INSTANCE

Singleton rule that reduces constants inside a HiveProject.

JOIN_INSTANCE

public static final org.apache.calcite.rel.rules.ReduceExpressionsRule JOIN_INSTANCE

Singleton rule that reduces constants inside a HiveJoin.

Constructor Detail

HiveReduceExpressionsRule

protected HiveReduceExpressionsRule(Class<? extends org.apache.calcite.rel.RelNode> clazz,
                                    org.apache.calcite.tools.RelBuilderFactory relBuilderFactory,
                                    String desc)

Creates a HiveReduceExpressionsRule.

Parameters:

clazz - class of rels to which this rule should apply