Coloring - Family of functions¶
Proposed
Warning
Proposed functions for next mayor release.
- They are not officially in the current release.
- They will likely officially be part of the next mayor release:
- The functions make use of ANY-INTEGER and ANY-NUMERICAL
- Name might not change. (But still can)
- Signature might not change. (But still can)
- Functionality might not change. (But still can)
- pgTap tests have being done. But might need more.
- Documentation might need refinement.
- pgr_sequentialVertexColoring - Proposed - Vertex coloring algorithm using greedy approach.
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
- pgr_bipartite -Experimental - Bipartite graph algorithm using a DFS-based coloring approach.
- pgr_edgeColoring - Experimental - Edge Coloring algorithm using Vizing’s theorem.
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 |
|
|
reverse_cost | ANY-NUMERICAL |
-1 |
|
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.
|
Returns SET OF (edge_id, color_id)
Column | Type | Description |
---|---|---|
edge_id | BIGINT |
Identifier of the edge. |
color_id | BIGINT |
Identifier of the color of the edge.
|