Package io.prestosql.sql.planner.optimizations

Class LocalProperties

java.lang.Object

io.prestosql.sql.planner.optimizations.LocalProperties

public final class LocalProperties
extends Object

Method Summary

Modifier and Type	Method	Description
static <T> Set<T>	extractLeadingConstants(List<? extends LocalProperty<T>> properties)
static <T> List<LocalProperty<T>>	grouped(Collection<T> columns)
static <T> List<Optional<LocalProperty<T>>>	match(List<LocalProperty<T>> actuals, List<LocalProperty<T>> desired)	Attempt to match the desired properties to a sequence of known properties.
static <T> List<LocalProperty<T>>	none()
static <T> List<Optional<LocalProperty<T>>>	normalize(List<? extends LocalProperty<T>> localProperties)	Normalizes the local properties by removing redundant symbols, but retains the original local property positions
static <T> List<LocalProperty<T>>	normalizeAndPrune(List<? extends LocalProperty<T>> localProperties)	Normalizes the local properties and potentially consolidates it to the smallest possible list NOTE: When normalized, each symbol will only appear once
static <T> List<LocalProperty<T>>	stripLeadingConstants(List<? extends LocalProperty<T>> properties)
static <X,Y> List<LocalProperty<Y>>	translate(List<? extends LocalProperty<X>> properties, Function<X,Optional<Y>> translator)	Translates the properties as much as possible, and truncates at the first non-translatable property

Methods inherited from class java.lang.Object

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

Method Detail

none

public static <T> List<LocalProperty<T>> none()

grouped

public static <T> List<LocalProperty<T>> grouped(Collection<T> columns)

stripLeadingConstants

public static <T> List<LocalProperty<T>> stripLeadingConstants(List<? extends LocalProperty<T>> properties)

extractLeadingConstants

public static <T> Set<T> extractLeadingConstants(List<? extends LocalProperty<T>> properties)

translate

public static <X,Y> List<LocalProperty<Y>> translate(List<? extends LocalProperty<X>> properties,
                                                           Function<X,Optional<Y>> translator)

Translates the properties as much as possible, and truncates at the first non-translatable property

match

public static <T> List<Optional<LocalProperty<T>>> match(List<LocalProperty<T>> actuals,
                                                         List<LocalProperty<T>> desired)

Attempt to match the desired properties to a sequence of known properties.

Returns a list of the same length as the original. Entries are: - Optional.empty(): the property was satisfied completely - non-empty: the (simplified) property that was not satisfied

normalizeAndPrune

public static <T> List<LocalProperty<T>> normalizeAndPrune(List<? extends LocalProperty<T>> localProperties)

Normalizes the local properties and potentially consolidates it to the smallest possible list NOTE: When normalized, each symbol will only appear once

normalize

public static <T> List<Optional<LocalProperty<T>>> normalize(List<? extends LocalProperty<T>> localProperties)

Normalizes the local properties by removing redundant symbols, but retains the original local property positions