org.apache.drill.exec.physical.impl.spill

Class RecordBatchSizer.ColumnSize

java.lang.Object

org.apache.drill.exec.physical.impl.spill.RecordBatchSizer.ColumnSize

Enclosing class:

RecordBatchSizer

public static class RecordBatchSizer.ColumnSize
extends Object

Column size information.

Field Summary

Fields

Modifier and Type	Field and Description
int	dataSize
int	elementCount Total number of elements for a repeated type, or 1 if this is a non-repeated type.
float	estElementCountPerArray The estimated, average number of elements per parent value.
int	estSize Actual average column width as determined from actual memory use.
boolean	isVariableWidth
MaterializedField	metadata
String	prefix
int	stdSize Assumed size from Drill metadata.
int	valueCount Number of occurrences of the value in the batch.

Constructor Summary

Constructors

Constructor and Description
RecordBatchSizer.ColumnSize(ValueVector v, String prefix)

Method Summary

Methods

Modifier and Type	Method and Description
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

prefix

public final String prefix

metadata

public final MaterializedField metadata

stdSize

public int stdSize

Assumed size from Drill metadata. Note that this information is 100% bogus for variable-width columns. Do not use it for such columns.

estSize

public final int estSize

Actual average column width as determined from actual memory use. This size is larger than the actual data size since this size includes per- column overhead such as any unused vector space, etc.

valueCount

public final int valueCount

Number of occurrences of the value in the batch. This is trivial for top-level scalars: it is the record count. For a top-level repeated vector, this is the number of arrays, also the record count. For a value nested inside a repeated map, it is the total number of values across all maps, and may be less than, greater than (but unlikely) same as the row count.

elementCount

public final int elementCount

Total number of elements for a repeated type, or 1 if this is a non-repeated type. That is, a batch of 100 rows may have an array with 10 elements per row. In this case, the element count is 1000.

dataSize

public int dataSize

estElementCountPerArray

public final float estElementCountPerArray

The estimated, average number of elements per parent value. Always 1 for a non-repeated type. For a repeated type, this is the average entries per array (per repeated element).

isVariableWidth

public final boolean isVariableWidth

Constructor Detail

RecordBatchSizer.ColumnSize

public RecordBatchSizer.ColumnSize(ValueVector v,
                           String prefix)

Method Detail

toString

public String toString()

Overrides:

toString in class Object