GetRingEdges
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## Name

GetRingEdges — Returns the ordered set of signed edge identifiers met by walking on an a given edge side.

## Synopsis

`getfaceedges_returntype GetRingEdges(`varchar atopology, integer aring, integer max_edges=null`)`;

## Description

Returns the ordered set of signed edge identifiers met by walking on an a given edge side. Each output consists of a sequence and a signed edge id. Sequence numbers start with value 1.

If you pass a positive edge id, the walk starts on the left side of the corresponding edge and follows the edge direction. If you pass a negative edge id, the walk starts on the right side of it and goes backward.

If `max_edges` is not null no more than those records are returned by that function. This is meant to be a safety parameter when dealing with possibly invalid topologies.

This function uses edge ring linking metadata.

Availability: 2.0.0

## See Also

ST_GetFaceEdges, GetNodeEdges

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