Overview - - Alibaba Cloud Documentation Center

Types

Element: An element step reads vertices or edges from a graph.
Map: A map step maps input objects to other objects.
Filter: A filter step filters input objects.
sideEffect: A sideEffect step allows input objects to proceed unchanged, but generates some computational sideEffects in the process.
Branch: A branch step splits input objects and sends each to an arbitrary location in the traversal.
Modulator: A modulator step provides parameters for other steps.
Function: Functions are provided to steps. For example, comparison functions can be provided to filter steps.
Policy: Users can customize policies for traversal steps.

Description

Note: Steps that are marked with asterisks (*) are extended steps of iGraph. Other steps are open source Apache Gremlin steps.

Type	Step	Description
Element	E	Reads edges from a graph.
	inV	Returns the vertices that are associated with an edge.
	out	Returns the vertices that are associated with a vertex
	outE	Returns the edges that are associated with a vertex
	V	Reads vertices from a graph.
Map	barrier	Serves as a barrier.
	bulk	Returns the bulk value of an element.
	cap	Returns the value of a sideEffect.
	constant	Returns a custom constant value.
	count	Counts the number of input objects.
	fold	Aggregates input objects into a list<object>.
	group	Groups input objects based on a specific rule.
	groupCount	Groups input objects based on a specific rule and returns the number of objects in each group.
	identity	Returns input objects.
	label	Returns the graph labels of elements.
	loops	Returns the number of times that the current loop has been gone through.
	math	Performs scientific calculation.
	max	Returns the maximum value of input objects.
	mean	Returns the average value of input objects.
	min	Returns the minimum value of input objects.
	order	Sorts input objects.
	path	Returns the path of a traversal.
	project	Maps input objects to a map<string,object>.
	properties	Returns the properties of an element.
	propertyMap	Returns a map of the properties of an element.
	sack	Returns the sack value of an element.
	select	Returns the objects with labels defined by an as() step.
	sum	Sums input objects.
	unfold	Unfolds a list<object> to objects.
	values	Returns the values of properties of an element.
Filter	and	Returns the input objects for which all child traversals have results.
	cyclicPath	Returns a cyclic path.
	dedup	Deduplicates input objects.
	distinct [*]	Hashes input objects based on a specific method and extracts a specific number of objects from each hash bucket.
	filter	Filters elements.
	has	Filters elements and returns the elements that meet the specified condition.
	hasKey	Filters elements based on field names and returns the names and values of the fields that meet the specified condition.
	hasLabel	Filters elements based on labels and returns the elements that meet the specified condition.
	hasValue	Filters elements based on field values and returns the names and values of the fields that meet the specified condition.
	is	Filters elements based on a number or string.
	limit	Returns a specific number of the first elements.
	not	Returns the input objects for which a child traversal returns no results.
	or	Returns the input objects for which at least one child traversal has results.
	range	Returns the objects in a specific range.
	sample	Samples objects.
	simplePath	Returns a simple path.
	tail	Returns a specific number of the last elements.
	where	Filters elements.
sideEffect	aggregate	Aggregates input objects into a list<object> with a barrier.
	alias [*]	Defines virtual fields for input elements.
	fields [*]	Retains the specified fields and removes other fields from elements.
	store	Aggregates input objects into a list<object> without a barrier.
Branch	branch	Performs branching queries.
	choose	Performs branching queries.
	coalesce	Evaluates the input traversals in sequence and returns the first traversal that finds at least one element.
	local	Runs a child traversal for each input object.
	optional	Returns the result of a child traversal if the child traversal has a result.
	repeat	Loops over a traversal.
	unoin	Merges the results of child traversals.
Modulator	as	Adds labels to input objects.
	by	Provides parameters such as traversals, functions, and comparators for other steps.
	emit	Returns the intermediate results of a loop.
	indexQuery [*]	Performs an inverted query.
	option	Specifies an option for branching queries.
	times	Specifies the number of times that a loop is gone through.
	until	Specifies the condition to break a loop.
	withSack	Defines initial value supplier, split operator, and merge operator for the sack of each element.
Function	P	Compares values.
	T	Extracts the information about elements.
	UDF [*]	Uses a user-defined function (UDF).
Policy	withStrategies	Applies a custom policy to a traversal.
	PathRecordStrategy	Specifies the type of information to be returned for a path.
	PushDownStrategy	Pushes a sideEffect step to the storage layer for execution.