MariaDB starting with 10.1.2

The ST_IsRing function was introduced in MariaDB 10.1.2

Syntax

ST_IsRing(g)
IsRing(g)

Description

Returns true if a given LINESTRING is a ring, that is, both ST_IsClosed and ST_IsSimple. A simple curve does not pass through the same point more than once. However, see MDEV-7510.

St_IsRing() and IsRing() are synonyms.

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