Equals(g1,g2)
From MariaDB 10.2.3:
MBREQUALS(g1,g2)
Returns 1 or 0 to indicate whether g1 is spatially equal to g2.
EQUALS() is based on the original MySQL implementation and uses object bounding rectangles, while ST_EQUALS() uses object shapes.
From MariaDB 10.2.3, MBREQUALS is a synonym for Equals.
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https://mariadb.com/kb/en/equals/