com.bigdata.bop.paths

Interface ArbitraryLengthPathOp.Annotations

All Superinterfaces:

BOp.Annotations, BufferAnnotations, PipelineOp.Annotations

Enclosing class:

ArbitraryLengthPathOp

public static interface ArbitraryLengthPathOp.Annotations
extends PipelineOp.Annotations

Field Summary

Fields

Modifier and Type	Field and Description
static int	DEFAULT_INITIAL_CAPACITY
static float	DEFAULT_LOAD_FACTOR
static String	DROP_VARS A list of intermediate variables (IVariables) used by the ALP op that should be dropped from the solutions after each round.
static String	EDGE_VAR The edge variable.
static String	INITIAL_CAPACITY The initial capacity of the ConcurrentHashMap used to impose the distinct filter (required to avoid duplicates).
static String	LEFT_TERM The left term - can be a variable or a constant.
static String	LOAD_FACTOR The load factor of the ConcurrentHashMap used to impose the distinct filter (required to avoid duplicates).
static String	LOWER_BOUND The lower bound on the number of rounds to run.
static String	MIDDLE_TERM The middle term - can be a variable or a constant.
static String	PROJECT_IN_VARS The vars projected into this ALP op.
static String	RIGHT_TERM The right term - can be a variable or a constant.
static String	SUBQUERY The subquery representing the path between left and right.
static String	TRANSITIVITY_VAR_LEFT The left transitivity variable.
static String	TRANSITIVITY_VAR_RIGHT The right transitivity variable.
static String	UPPER_BOUND The upper bound on the number of rounds to run.

Fields inherited from interface com.bigdata.bop.PipelineOp.Annotations

ALT_SINK_REF, DEFAULT_LAST_PASS, DEFAULT_MAX_MEMORY, DEFAULT_MAX_MESSAGES_PER_TASK, DEFAULT_MAX_PARALLEL, DEFAULT_PIPELINE_QUEUE_CAPACITY, DEFAULT_PIPELINED, DEFAULT_REORDER_SOLUTIONS, DEFAULT_SHARED_STATE, LAST_PASS, MAX_MEMORY, MAX_MESSAGES_PER_TASK, MAX_PARALLEL, PIPELINE_QUEUE_CAPACITY, PIPELINED, REORDER_SOLUTIONS, SHARED_STATE, SINK_REF

Fields inherited from interface com.bigdata.bop.BOp.Annotations

BOP_ID, CONTROLLER, DEFAULT_CONTROLLER, DEFAULT_EVALUATION_CONTEXT, DEFAULT_TIMEOUT, EVALUATION_CONTEXT, NAMESPACE, TIMEOUT

Fields inherited from interface com.bigdata.bop.BufferAnnotations

CHUNK_CAPACITY, CHUNK_OF_CHUNKS_CAPACITY, CHUNK_TIMEOUT, chunkTimeoutUnit, DEFAULT_CHUNK_CAPACITY, DEFAULT_CHUNK_OF_CHUNKS_CAPACITY, DEFAULT_CHUNK_TIMEOUT

Field Detail

SUBQUERY

static final String SUBQUERY

The subquery representing the path between left and right.

LEFT_TERM

static final String LEFT_TERM

The left term - can be a variable or a constant.

RIGHT_TERM

static final String RIGHT_TERM

The right term - can be a variable or a constant.

TRANSITIVITY_VAR_LEFT

static final String TRANSITIVITY_VAR_LEFT

The left transitivity variable.

TRANSITIVITY_VAR_RIGHT

static final String TRANSITIVITY_VAR_RIGHT

The right transitivity variable.

LOWER_BOUND

static final String LOWER_BOUND

The lower bound on the number of rounds to run. Can be zero (0) or one (1). A lower bound of zero is a special kind of path - the Zero Length Path. A zero length path connects a vertex to itself (in graph parlance). In the context of arbitrary length paths it means we bind the input onto the output regardless of whether they are actually connected via the path or not.

UPPER_BOUND

static final String UPPER_BOUND

The upper bound on the number of rounds to run.

PROJECT_IN_VARS

static final String PROJECT_IN_VARS

The vars projected into this ALP op.

INITIAL_CAPACITY

static final String INITIAL_CAPACITY

The initial capacity of the ConcurrentHashMap used to impose the distinct filter (required to avoid duplicates).

See Also:

DEFAULT_INITIAL_CAPACITY

DEFAULT_INITIAL_CAPACITY

static final int DEFAULT_INITIAL_CAPACITY

See Also:

Constant Field Values

LOAD_FACTOR

static final String LOAD_FACTOR

The load factor of the ConcurrentHashMap used to impose the distinct filter (required to avoid duplicates).

See Also:

DEFAULT_LOAD_FACTOR

DEFAULT_LOAD_FACTOR

static final float DEFAULT_LOAD_FACTOR

See Also:

Constant Field Values

MIDDLE_TERM

static final String MIDDLE_TERM

The middle term - can be a variable or a constant. Only used when edge var is present.

EDGE_VAR

static final String EDGE_VAR

The edge variable. This is an extension that allows the caller to understand how a node was visited (what was the edge that led to it). If set, this will allow in duplicate solutions in violation of the SPARQL spec (if a node can be reached by more than one path there will be one solution emitted per path). Used in conjunction with the middle term. If the middle term is a var, the edge var must not be the same var, since the middle var is used to calculate transitive closure.

DROP_VARS

static final String DROP_VARS

A list of intermediate variables (IVariables) used by the ALP op that should be dropped from the solutions after each round.