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

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.LimitStatsRule LIMIT operator changes the number of rows and thereby the data size.
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.

Constructor Summary

StatsRulesProcFactory()

Method Summary

static NodeProcessor	getDefaultRule()
static NodeProcessor	getFilterRule()
static NodeProcessor	getGroupByRule()
static NodeProcessor	getJoinRule()
static NodeProcessor	getLimitRule()
static NodeProcessor	getSelectRule()
static NodeProcessor	getTableScanRule()

Methods inherited from class java.lang.Object

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

Constructor Detail

StatsRulesProcFactory

public StatsRulesProcFactory()

Method Detail

getTableScanRule

public static NodeProcessor getTableScanRule()

getSelectRule

public static NodeProcessor getSelectRule()

getFilterRule

public static NodeProcessor getFilterRule()

getGroupByRule

public static NodeProcessor getGroupByRule()

getJoinRule

public static NodeProcessor getJoinRule()

getLimitRule

public static NodeProcessor getLimitRule()

getDefaultRule

public static NodeProcessor getDefaultRule()