com.bigdata.bop.join

Class BaseJoinStats

java.lang.Object

com.bigdata.bop.engine.BOpStats

com.bigdata.bop.join.BaseJoinStats

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

PipelineJoinStats

public class BaseJoinStats
extends BOpStats

Extended to expose counters shared by various join operators (some join operators may define more counters as well).

Version:

$Id$

Author:

Bryan Thompson

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
CAT	accessPathChunksIn The #of chunks read from an IAccessPath.
CAT	accessPathCount The #of access paths which were evaluated.
CAT	accessPathDups The #of duplicate access paths which were detected and filtered out.
CAT	accessPathRangeCount The running sum of the range counts of the accepted as-bound access paths.
CAT	accessPathUnitsIn The #of elements read from an IAccessPath.

Fields inherited from class com.bigdata.bop.engine.BOpStats

chunksIn, chunksOut, elapsed, mutationCount, opCount, typeErrors, unitsIn, unitsOut

Constructor Summary

Constructors

Constructor and Description
BaseJoinStats()

Method Summary

Methods

Modifier and Type	Method and Description
void	add(BOpStats o) Combine the statistics (addition), but do NOT add to self.
protected void	toString(StringBuilder sb) Extension hook for BOpStats.toString().

Methods inherited from class com.bigdata.bop.engine.BOpStats

toString

Methods inherited from class java.lang.Object

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

Field Detail

accessPathDups

public final CAT accessPathDups

The #of duplicate access paths which were detected and filtered out. This will be ZERO (0L) unless the join operator can coalesce access paths.

accessPathCount

public final CAT accessPathCount

The #of access paths which were evaluated. Each access path corresponds to one or more input binding sets having the same binding pattern for the variables appearing in the access path.

Note: Some join operators can coalesce duplicate access paths. Such operators may reported fewer access paths here.

Note: Hash join operators typically run the access path exactly once (if they are written to use the native heap and their memory budget is exceeded then they may run the access path more than once).

accessPathRangeCount

public final CAT accessPathRangeCount

The running sum of the range counts of the accepted as-bound access paths.

accessPathChunksIn

public final CAT accessPathChunksIn

The #of chunks read from an IAccessPath.

accessPathUnitsIn

public final CAT accessPathUnitsIn

The #of elements read from an IAccessPath.

Constructor Detail

BaseJoinStats

public BaseJoinStats()

Method Detail

add

public void add(BOpStats o)

Description copied from class: BOpStats

Combine the statistics (addition), but do NOT add to self.

Overrides:

add in class BOpStats

Parameters:

o - Another statistics object.

toString

protected void toString(StringBuilder sb)

Description copied from class: BOpStats

Extension hook for BOpStats.toString().

Overrides:

toString in class BOpStats

Parameters:

sb - Where to write the additional state.