com.facebook.presto.spi.relation

Enum ExpressionOptimizer.Level

java.lang.Object

java.lang.Enum<ExpressionOptimizer.Level>

com.facebook.presto.spi.relation.ExpressionOptimizer.Level

All Implemented Interfaces:

Serializable, Comparable<ExpressionOptimizer.Level>

Enclosing interface:

ExpressionOptimizer

public static enum ExpressionOptimizer.Level
extends Enum<ExpressionOptimizer.Level>

Enum Constant Summary

Enum Constants

Enum Constant and Description
EVALUATED EVALUATE attempt to evaluate the RowExpression into a constant, even though it can be non-deterministic.
OPTIMIZED OPTIMIZED removes all redundancy in a RowExpression but can end up with non-serializable objects (e.g., Regex).
SERIALIZABLE SERIALIZABLE guarantees the optimized RowExpression can be serialized and deserialized.

Method Summary

Modifier and Type	Method and Description
static ExpressionOptimizer.Level	valueOf(String name) Returns the enum constant of this type with the specified name.
static ExpressionOptimizer.Level[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

SERIALIZABLE

public static final ExpressionOptimizer.Level SERIALIZABLE

SERIALIZABLE guarantees the optimized RowExpression can be serialized and deserialized.

OPTIMIZED

public static final ExpressionOptimizer.Level OPTIMIZED

OPTIMIZED removes all redundancy in a RowExpression but can end up with non-serializable objects (e.g., Regex).

EVALUATED

public static final ExpressionOptimizer.Level EVALUATED

EVALUATE attempt to evaluate the RowExpression into a constant, even though it can be non-deterministic.

Method Detail

values

public static ExpressionOptimizer.Level[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (ExpressionOptimizer.Level c : ExpressionOptimizer.Level.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static ExpressionOptimizer.Level valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null