org.apache.drill.exec.planner.index

Class MapRDBStatistics

java.lang.Object

org.apache.drill.exec.planner.index.MapRDBStatistics

All Implemented Interfaces:

Statistics

public class MapRDBStatistics
extends Object
implements Statistics

Field Summary

Fields inherited from interface org.apache.drill.exec.planner.index.Statistics

AVG_COLUMN_SIZE, AVG_ROWSIZE_UNKNOWN, ROWCOUNT_HUGE, ROWCOUNT_UNKNOWN

Constructor Summary

Constructors

Constructor and Description
MapRDBStatistics()

Method Summary

Modifier and Type	Method and Description
String	buildUniqueIndexIdentifier(IndexDescriptor idx) Returns a unique index identifier
String	buildUniqueIndexIdentifier(String tableName, String idxName)
double	getAvgRowSize(String tabIdxName, boolean isTableScan) Returns the average row size for the specified filter condition
double	getLeadingRowCount(org.ojai.store.QueryCondition condition, String tabIdxName) Returns the number of leading rows satisfying the given FILTER condition
double	getLeadingRowCount(org.apache.calcite.rex.RexNode condition, String tabIdxName, DrillScanRelBase scanRel) Returns the number of leading rows satisfying the given FILTER condition
double	getRowCount(org.ojai.store.QueryCondition condition, String tabIdxName) Returns the number of rows satisfying the given FILTER condition
double	getRowCount(org.apache.calcite.rex.RexNode condition, String tabIdxName, org.apache.calcite.rel.RelNode scanRel) Returns the rowcount for the specified filter condition
double	getRowKeyJoinBackIOFactor()
boolean	initialize(org.apache.calcite.rex.RexNode condition, DrillScanRelBase scanRel, IndexCallContext context)
boolean	isStatsAvailable() Returns whether statistics are available.

Methods inherited from class java.lang.Object

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

Constructor Detail

MapRDBStatistics

public MapRDBStatistics()

Method Detail

getRowKeyJoinBackIOFactor

public double getRowKeyJoinBackIOFactor()

isStatsAvailable

public boolean isStatsAvailable()

Description copied from interface: Statistics

Returns whether statistics are available. Should be called prior to using the statistics

Specified by:

isStatsAvailable in interface Statistics

buildUniqueIndexIdentifier

public String buildUniqueIndexIdentifier(IndexDescriptor idx)

Description copied from interface: Statistics

Returns a unique index identifier

Specified by:

buildUniqueIndexIdentifier in interface Statistics

Parameters:

idx - - Index specified as a IndexDescriptor

Returns:

The unique index identifier

buildUniqueIndexIdentifier

public String buildUniqueIndexIdentifier(String tableName,
                                         String idxName)

getRowCount

public double getRowCount(org.apache.calcite.rex.RexNode condition,
                          String tabIdxName,
                          org.apache.calcite.rel.RelNode scanRel)

Description copied from interface: Statistics

Returns the rowcount for the specified filter condition

Specified by:

getRowCount in interface Statistics

Parameters:

condition - - Filter specified as a RexNode

tabIdxName - - The index name generated using buildUniqueIndexIdentifier

scanRel - - The current scan rel

Returns:

the rowcount for the filter

getRowCount

public double getRowCount(org.ojai.store.QueryCondition condition,
                          String tabIdxName)

Returns the number of rows satisfying the given FILTER condition

Parameters:

condition - - FILTER specified as a QueryCondition

tabIdxName - - The table/index identifier

Returns:

approximate rows satisfying the filter

getLeadingRowCount

public double getLeadingRowCount(org.apache.calcite.rex.RexNode condition,
                                 String tabIdxName,
                                 DrillScanRelBase scanRel)

Returns the number of leading rows satisfying the given FILTER condition

Specified by:

getLeadingRowCount in interface Statistics

Parameters:

condition - - FILTER specified as a RexNode

tabIdxName - - The table/index identifier

scanRel - - The current scanRel

Returns:

approximate rows satisfying the leading filter

getLeadingRowCount

public double getLeadingRowCount(org.ojai.store.QueryCondition condition,
                                 String tabIdxName)

Returns the number of leading rows satisfying the given FILTER condition

Parameters:

condition - - FILTER specified as a QueryCondition

tabIdxName - - The table/index identifier

Returns:

approximate rows satisfying the leading filter

getAvgRowSize

public double getAvgRowSize(String tabIdxName,
                            boolean isTableScan)

Description copied from interface: Statistics

Returns the average row size for the specified filter condition

Specified by:

getAvgRowSize in interface Statistics

Parameters:

tabIdxName - - The index name generated using buildUniqueIndexIdentifier

isTableScan - - Whether the current rel is an index scan (false for primary table)

initialize

public boolean initialize(org.apache.calcite.rex.RexNode condition,
                          DrillScanRelBase scanRel,
                          IndexCallContext context)

Specified by:

initialize in interface Statistics