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https://dev.mysql.com/doc/refman/8.0/en/gis-mysql-specific-functions.html
GeomCollection() returns all the proper geometries contained in the arguments even if a nonsupported geometry is present. GeometryCollection() returns all the proper geometries contained in the arguments even if a nonsupported geometry is present.
https://dev.mysql.com/doc/refman/8.0/en/gis-wkb-functions.html
These functions are available for creating geometries from WKB values: ST_GeomCollFromWKB(wkb [, srid [, options]]), ST_GeometryCollectionFromWKB(wkb [, srid [, options]]) Constructs a GeometryCollection value using its WKB representation and SRID.
https://dev.mysql.com/doc/refman/8.0/en/gis-wkt-functions.html
These functions are available for creating geometries from WKT values: ST_GeomCollFromText(wkt [, srid [, options]]), ST_GeometryCollectionFromText(wkt [, srid [, options]]), ST_GeomCollFromTxt(wkt [, srid [, options]]) Constructs a ... These ...
https://dev.mysql.com/doc/refman/8.0/en/spatial-relation-functions-object-shapes.html
If any geometry argument is geometrically invalid, either the result is true or false (it is undefined which), or an error occurs. If a unit is not specified, the result is in the unit of the SRS of the geometries, whether Cartesian or geographic.
https://dev.mysql.com/doc/refman/8.0/en/spatial-convenience-functions.html
If both geometry parameters are valid Cartesian Point or MultiPoint values in SRID 0, the return value is shortest distance between the two geometries on a sphere with the provided radius. If both geometry parameters are valid Point or MultiPoint ...
https://dev.mysql.com/doc/refman/8.0/en/gis-property-functions.html
Each function that belongs to this group takes a geometry value as its argument and returns some quantitative or qualitative property of the geometry. Such functions return NULL if the argument is of an incorrect geometry type. For example, the ...
https://dev.mysql.com/doc/refman/8.0/en/spatial-relation-functions.html
The functions described in this section take two geometries as arguments and return a qualitative or quantitative relation between them. MySQL implements two sets of functions using function names defined by the OpenGIS specification. One set tests ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-st-geometry-columns-table.html
The ST_GEOMETRY_COLUMNS table provides information about table columns that store spatial data. This table is based on the SQL/MM (ISO/IEC 13249-3) standard, with extensions as noted. MySQL implements ST_GEOMETRY_COLUMNS as a view on the ...
https://dev.mysql.com/doc/refman/8.0/en/spatial-function-argument-handling.html
Spatial values, or geometries, have the properties described in Section 13.4.2.2, “Geometry Class”. Specific functions or groups of functions may have additional or different argument-handling characteristics, as discussed in the sections where ...
https://dev.mysql.com/doc/refman/8.0/en/gis-polygon-property-functions.html
As of MySQL 8.0.13, ST_Area() handles its arguments as described in the introduction to this section, with these exceptions: If the geometry is geometrically invalid, either the result is an undefined area (that is, it can be any number), or an ...