St_geometry_ops specifies the operator class.
st_geometry_ops指定操作符类。
The operator class is typically a set of functions.
操作符类通常为一组函数。
To execute this command you must be the owner of the operator class.
要执行这条命令，你必须是此操作符表的所有者。
To execute this command you must be the owner of the operator class.
要执行这条命令，你必须是此操作符表的所有者。
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