io.prestosql.sql.planner.optimizations

Class HashGenerationOptimizer

java.lang.Object

io.prestosql.sql.planner.optimizations.HashGenerationOptimizer

All Implemented Interfaces:

PlanOptimizer

public class HashGenerationOptimizer
extends Object
implements PlanOptimizer

Field Summary

Fields

Modifier and Type	Field and Description
static int	INITIAL_HASH_VALUE

Constructor Summary

Constructors

Constructor and Description
HashGenerationOptimizer()

Method Summary

Modifier and Type	Method and Description
static Optional<io.prestosql.sql.planner.optimizations.HashGenerationOptimizer.HashComputation>	computeHash(Iterable<Symbol> fields)
static Optional<Expression>	getHashExpression(List<Symbol> symbols)
PlanNode	optimize(PlanNode plan, Session session, TypeProvider types, SymbolAllocator symbolAllocator, PlanNodeIdAllocator idAllocator, WarningCollector warningCollector)

Methods inherited from class java.lang.Object

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

Field Detail

INITIAL_HASH_VALUE

public static final int INITIAL_HASH_VALUE

See Also:

Constant Field Values

Constructor Detail

HashGenerationOptimizer

public HashGenerationOptimizer()

Method Detail

optimize

public PlanNode optimize(PlanNode plan,
                         Session session,
                         TypeProvider types,
                         SymbolAllocator symbolAllocator,
                         PlanNodeIdAllocator idAllocator,
                         WarningCollector warningCollector)

Specified by:

optimize in interface PlanOptimizer

computeHash

public static Optional<io.prestosql.sql.planner.optimizations.HashGenerationOptimizer.HashComputation> computeHash(Iterable<Symbol> fields)

getHashExpression

public static Optional<Expression> getHashExpression(List<Symbol> symbols)