org.apache.drill.exec.physical.impl.aggregate

Enum StreamingAggregator.AggOutcome

java.lang.Object

java.lang.Enum<StreamingAggregator.AggOutcome>

org.apache.drill.exec.physical.impl.aggregate.StreamingAggregator.AggOutcome

All Implemented Interfaces:

Serializable, Comparable<StreamingAggregator.AggOutcome>

Enclosing interface:

StreamingAggregator

public static enum StreamingAggregator.AggOutcome
extends Enum<StreamingAggregator.AggOutcome>

The Aggregator can return one of the following outcomes:

RETURN_OUTCOME: The aggregation has seen a change in the group and should send data downstream. If complex writers are involved, then rebuild schema.

CLEANUP_AND_RETURN: End of all data. Return the data downstream, and cleanup.

UPDATE_AGGREGATOR: A schema change was encountered. The aggregator's generated code and (possibly) container need to be updated

RETURN_AND_RESET: If the aggregator encounters an EMIT, then that implies the end of a data set but not of all the data. Return the data (aggregated so far) downstream, reset the internal state variables and come back for the next data set.

See Also:

HashAggregator.AggOutcome

Enum Constant Summary

Enum Constants

Enum Constant and Description
CLEANUP_AND_RETURN
RETURN_AND_RESET
RETURN_OUTCOME
UPDATE_AGGREGATOR

Method Summary

Modifier and Type	Method and Description
static StreamingAggregator.AggOutcome	valueOf(String name) Returns the enum constant of this type with the specified name.
static StreamingAggregator.AggOutcome[]	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

RETURN_OUTCOME

public static final StreamingAggregator.AggOutcome RETURN_OUTCOME

CLEANUP_AND_RETURN

public static final StreamingAggregator.AggOutcome CLEANUP_AND_RETURN

UPDATE_AGGREGATOR

public static final StreamingAggregator.AggOutcome UPDATE_AGGREGATOR

RETURN_AND_RESET

public static final StreamingAggregator.AggOutcome RETURN_AND_RESET

Method Detail

values

public static StreamingAggregator.AggOutcome[] 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 (StreamingAggregator.AggOutcome c : StreamingAggregator.AggOutcome.values())
    System.out.println(c);

Returns:

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

valueOf

public static StreamingAggregator.AggOutcome 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