io.prestosql.sql.planner

Class SortExpressionExtractor

java.lang.Object

io.prestosql.sql.planner.SortExpressionExtractor

public final class SortExpressionExtractor
extends Object

Extracts sort expression to be used for creating SortedPositionLinks from join filter expression. Currently this class can extract sort and search expressions from filter function conjuncts of shape:

A.a < f(B.x, B.y, B.z) or f(B.x, B.y, B.z) < A.a

where a is the build side symbol reference and x,y,z are probe side symbol references. Any of inequality operators (<,<=,>,>=) can be used. Same build side symbol need to be used in all conjuncts.

Method Summary

Modifier and Type	Method and Description
static Optional<SortExpressionContext>	extractSortExpression(Set<Symbol> buildSymbols, Expression filter)

Methods inherited from class java.lang.Object

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

Method Detail

extractSortExpression

public static Optional<SortExpressionContext> extractSortExpression(Set<Symbol> buildSymbols,
                                                                    Expression filter)