com.facebook.presto.hive.zorder

Class ZValueRange

java.lang.Object

com.facebook.presto.hive.zorder.ZValueRange

public class ZValueRange
extends Object

The ZValueRange class contains Optional Integer minimum and maximum value lists. If existing, they are all inclusive.

Examples of converting queries into ZValueRange variables: (1) "column == 5" -> new ZValueRange(ImmutableList.of(Optional.of(5)), ImmutableList.of(Optional.of(5))); (2) "column >= 0 AND column <= 9" -> new ZValueRange(ImmutableList.of(Optional.of(0)), ImmutableList.of(Optional.of(9))); (3) "column >= 1" -> new ZValueRange(ImmutableList.of(Optional.of(1)), ImmutableList.of(Optional.empty())); (4) no range for column -> new ZValueRange(ImmutableList.of(Optional.empty()), ImmutableList.of(Optional.empty())); (5) "column <= 5 OR column >= 10" -> new ZValueRange(ImmutableList.of(Optional.empty(), Optional.of(10)), ImmutableList.of(Optional.of(5), Optional.empty()));

Constructor Summary

Constructors

Constructor and Description
ZValueRange(List<Optional<Integer>> minimumValues, List<Optional<Integer>> maximumValues) Class constructor initializing minimumValues and maximumValues from optional minimum/maximum value ranges.

Method Summary

Modifier and Type	Method and Description
List<Integer>	getMaximumValues(int maximumBits) Sets null maximum values to the default maximum value based on maximumBits before returning the list.
List<Integer>	getMinimumValues(int maximumBits) Sets null minimum values to the default minimum value based on maximumBits before returning the list.

Methods inherited from class java.lang.Object

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

Constructor Detail

ZValueRange

public ZValueRange(List<Optional<Integer>> minimumValues,
                   List<Optional<Integer>> maximumValues)

Class constructor initializing minimumValues and maximumValues from optional minimum/maximum value ranges.

A value can be set to Optional.empty(), or null, if the query is unbounded in any dimension.

Method Detail

getMinimumValues

public List<Integer> getMinimumValues(int maximumBits)

Sets null minimum values to the default minimum value based on maximumBits before returning the list. The default minimum value will be -(1 << maximumBits).

Parameters:

maximumBits - the maximum amount of bits the values can have, not including the sign bit

Returns:

a list of non-null minimum range values

getMaximumValues

public List<Integer> getMaximumValues(int maximumBits)

Sets null maximum values to the default maximum value based on maximumBits before returning the list. The default maximum value will be (1 << maximumBits) - 1.

Parameters:

maximumBits - the maximum amount of bits the values can have, not including the sign bit

Returns:

a list of non-null maximum range values