org.apache.hadoop.hive.ql.optimizer.stats.annotation

Class StatsRulesProcFactory

java.lang.Object

org.apache.hadoop.hive.ql.optimizer.stats.annotation.StatsRulesProcFactory

public class StatsRulesProcFactory
extends Object

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	StatsRulesProcFactory.DefaultStatsRule Default rule is to aggregate the statistics from all its parent operators.
static class	StatsRulesProcFactory.FilterStatsRule FILTER operator does not change the average row size but it does change the number of rows emitted.
static class	StatsRulesProcFactory.GroupByStatsRule GROUPBY operator changes the number of rows.
static class	StatsRulesProcFactory.JoinStatsRule JOIN operator can yield any of the following three cases The values of join keys are disjoint in both relations in which case T(RXS) = 0 (we need histograms for this) Join key is primary key on relation R and foreign key on relation S in which case every tuple in S will have a tuple in R T(RXS) = T(S) (we need histograms for this) Both R & S relation have same value for join-key.
static class	StatsRulesProcFactory.LateralViewJoinStatsRule LateralViewJoinOperator changes the data size and column level statistics.
static class	StatsRulesProcFactory.LimitStatsRule LIMIT operator changes the number of rows and thereby the data size.
static class	StatsRulesProcFactory.ReduceSinkStatsRule ReduceSink operator does not change any of the statistics.
static class	StatsRulesProcFactory.SelectStatsRule SELECT operator doesn't change the number of rows emitted from the parent operator.
static class	StatsRulesProcFactory.TableScanStatsRule Collect basic statistics like number of rows, data size and column level statistics from the table.
static class	StatsRulesProcFactory.UDTFStatsRule UDTF operator changes the number of rows and thereby the data size.

Constructor Summary

Constructors

Constructor and Description
StatsRulesProcFactory()

Method Summary

Modifier and Type	Method and Description
static SemanticNodeProcessor	getDefaultRule()
static SemanticNodeProcessor	getFilterRule()
static SemanticNodeProcessor	getGroupByRule()
static SemanticNodeProcessor	getJoinRule()
static SemanticNodeProcessor	getLateralViewJoinRule()
static SemanticNodeProcessor	getLimitRule()
static SemanticNodeProcessor	getReduceSinkRule()
static SemanticNodeProcessor	getSelectRule()
static SemanticNodeProcessor	getTableScanRule()
static SemanticNodeProcessor	getUDTFRule()

Methods inherited from class java.lang.Object

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

Constructor Detail

StatsRulesProcFactory

public StatsRulesProcFactory()

Method Detail

getTableScanRule

public static SemanticNodeProcessor getTableScanRule()

getSelectRule

public static SemanticNodeProcessor getSelectRule()

getFilterRule

public static SemanticNodeProcessor getFilterRule()

getGroupByRule

public static SemanticNodeProcessor getGroupByRule()

getJoinRule

public static SemanticNodeProcessor getJoinRule()

getLimitRule

public static SemanticNodeProcessor getLimitRule()

getReduceSinkRule

public static SemanticNodeProcessor getReduceSinkRule()

getUDTFRule

public static SemanticNodeProcessor getUDTFRule()

getLateralViewJoinRule

public static SemanticNodeProcessor getLateralViewJoinRule()

getDefaultRule

public static SemanticNodeProcessor getDefaultRule()