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

Class HiveReduceExpressionsWithStatsRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

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

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

This rule simplifies the condition in Filter operators using the column statistics (if available). For instance, given the following predicate: a > 5 we can infer that the predicate will evaluate to false if the max value for column a is 4. Currently we support the simplification of: - =, >=, <=, >, < - IN - IS_NULL / IS_NOT_NULL

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static class	HiveReduceExpressionsWithStatsRule.RexReplacer Replaces expressions with their reductions.

Field Summary

Fields

Modifier and Type	Field and Description
static HiveReduceExpressionsWithStatsRule	INSTANCE
protected static org.slf4j.Logger	LOG

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

description, operands, relBuilderFactory

Method Summary

Modifier and Type	Method and Description
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

Field Detail

LOG

protected static final org.slf4j.Logger LOG

INSTANCE

public static final HiveReduceExpressionsWithStatsRule INSTANCE

Method Detail

onMatch

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

Specified by:

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