Coloring - Family of functions (Experimental)

Warning

Possible server crash

  • These functions might create a server crash

Warning

Experimental functions

  • They are not officially of the current release.
  • They likely will not be officially be part of the next release:
    • The functions might not make use of ANY-INTEGER and ANY-NUMERICAL
    • Name might change.
    • Signature might change.
    • Functionality might change.
    • pgTap tests might be missing.
    • Might need c/c++ coding.
    • May lack documentation.
    • Documentation if any might need to be rewritten.
    • Documentation examples might need to be automatically generated.
    • Might need a lot of feedback from the comunity.
    • Might depend on a proposed function of pgRouting
    • Might depend on a deprecated function of pgRouting

Parameters

Parameter Type Description
Edges SQL TEXT Inner query as described below.

Inner query

Edges SQL:an SQL query of an undirected graph, which should return a set of rows with the following columns:
Column Type Default Description
id ANY-INTEGER   Identifier of the edge.
source ANY-INTEGER   Identifier of the first end point vertex of the edge.
target ANY-INTEGER   Identifier of the second end point vertex of the edge.
cost ANY-NUMERICAL  
  • When positive: edge (source, target) exist on the graph.
  • When negative: edge (source, target) does not exist on the graph.
reverse_cost ANY-NUMERICAL -1
  • When positive: edge (target, source) exist on the graph.
  • When negative: edge (target, source) does not exist on the graph.

Where:

ANY-INTEGER:SMALLINT, INTEGER, BIGINT
ANY-NUMERICAL:SMALLINT, INTEGER, BIGINT, REAL, FLOAT

Result Columns

Returns SET OF (vertex_id, color_id)

Column Type Description
vertex_id BIGINT Identifier of the vertex.
color_id BIGINT

Identifier of the color of the vertex.

  • The minimum value of color is 1.