/query/graph

URL: https://<aws.fqdn>/<aws.cluster.name>/gpudb-0/query/graph

Employs a topological query on a network graph generated a-priori by /create/graph and returns a list of adjacent edge(s) or node(s), also known as an adjacency list, depending on what's been provided to the endpoint; providing edges will return nodes and providing nodes will return edges.

To determine the node(s) or edge(s) adjacent to a value from a given column, provide a list of values to input parameter queries. This field can be populated with column values from any table as long as the type is supported by the given identifier. See Query Identifiers for more information.

To return the adjacency list in the response, leave input parameter adjacency_table empty.

IMPORTANT: It's highly recommended that you review the Network Graphs & Solvers concepts documentation, the Graph REST Tutorial, and/or some /match/graph examples before using this endpoint.

Input Parameter Description

NameTypeDescription
graph_namestringName of the graph resource to query.
queriesarray of stringsNodes or edges to be queried specified using query identifiers. Identifiers can be used with existing column names, e.g., 'table.column AS QUERY_NODE_ID', raw values, e.g., '{0, 2} AS QUERY_NODE_ID', or expressions, e.g., 'ST_MAKEPOINT(table.x, table.y) AS QUERY_NODE_WKTPOINT'. Multiple values can be provided as long as the same identifier is used for all values. If using raw values in an identifier combination, the number of values specified must match across the combination.
restrictionsarray of stringsAdditional restrictions to apply to the nodes/edges of an existing graph. Restrictions must be specified using identifiers; identifiers are grouped as combinations. Identifiers can be used with existing column names, e.g., 'table.column AS RESTRICTIONS_EDGE_ID', expressions, e.g., 'column/2 AS RESTRICTIONS_VALUECOMPARED', or raw values, e.g., '{0, 0, 0, 1} AS RESTRICTIONS_ONOFFCOMPARED'. If using raw values in an identifier combination, the number of values specified must match across the combination. The default value is an empty array ( [] ).
adjacency_tablestringName of the table to store the resulting adjacencies, in [schema_name.]table_name format, using standard name resolution rules and meeting table naming criteria. If left blank, the query results are instead returned in the response. If the 'QUERY_TARGET_NODE_LABEL' query identifier is used in input parameter queries, then two additional columns will be available: 'PATH_ID' and 'RING_ID'. See Using Labels for more information. The default value is ''.
ringsintSets the number of rings around the node to query for adjacency, with '1' being the edges directly attached to the queried node. Also known as number of hops. For example, if it is set to '2', the edge(s) directly attached to the queried node(s) will be returned; in addition, the edge(s) attached to the node(s) attached to the initial ring of edge(s) surrounding the queried node(s) will be returned. If the value is set to '0', any nodes that meet the criteria in input parameter queries and input parameter restrictions will be returned. This parameter is only applicable when querying nodes. The default value is 1.
optionsmap of string to strings

Additional parameters. The default value is an empty map ( {} ).

Supported Parameters (keys)Parameter Description
force_undirected

If set to true, all inbound edges and outbound edges relative to the node will be returned. If set to false, only outbound edges relative to the node will be returned. This parameter is only applicable if the queried graph input parameter graph_name is directed and when querying nodes. Consult Directed Graphs for more details. The default value is false. The supported values are:

  • true
  • false
limitWhen specified (>0), limits the number of query results. The size of the nodes table will be limited by the limit value. The default value is '0'.
output_wkt_path

If true then concatenated wkt line segments will be added as the WKT column of the adjacency table. The default value is false. The supported values are:

  • true
  • false
and_labels

If set to true, the result of the query has entities that satisfy all of the target labels, instead of any. The default value is false. The supported values are:

  • true
  • false
server_idIndicates which graph server(s) to send the request to. Default is to send to the server, amongst those containing the corresponding graph, that has the most computational bandwidth.
output_charn_lengthWhen specified (>0 and <=256), limits the number of char length on the output tables for string based nodes. The default length is 64. The default value is '64'.
find_common_labels

If set to true, for many-to-many queries or multi-level traversals, it lists the common labels between the source and target nodes and edge labels in each path. Otherwise (zero rings), it'll list all labels of the node(s) queried. The default value is false. The supported values are:

  • true
  • false

Output Parameter Description

The GPUdb server embeds the endpoint response inside a standard response structure which contains status information and the actual response to the query. Here is a description of the various fields of the wrapper:

NameTypeDescription
statusString'OK' or 'ERROR'
messageStringEmpty if success or an error message
data_typeString'query_graph_response' or 'none' in case of an error
dataStringEmpty string
data_strJSON or String

This embedded JSON represents the result of the /query/graph endpoint:

NameTypeDescription
resultbooleanIndicates a successful query.
adjacency_list_int_arrayarray of longsThe adjacency entity integer ID: either edge IDs per node requested (if using QUERY_EDGE_ID or QUERY_NODE1_ID and QUERY_NODE2_ID in the input) or two node IDs per edge requested (if using QUERY_NODE_ID in the input).
adjacency_list_string_arrayarray of stringsThe adjacency entity string ID: either edge IDs per node requested (if using QUERY_EDGE_NAME or QUERY_NODE1_NAME and QUERY_NODE2_NAME in the input) or two node IDs per edge requested (if using QUERY_NODE_NAME in the input).
adjacency_list_wkt_arrayarray of stringsThe adjacency entity WKTPOINT or WKTLINE ID: either edge IDs per node requested (if using QUERY_EDGE_WKTLINE or QUERY_NODE1_WKTPOINT and QUERY_NODE2_WKTPOINT in the input) or two node IDs per edge requested (if using QUERY_NODE_WKTPOINT in the input).
infomap of string to stringsAdditional information.

Empty string in case of an error.