pg_range stores information about range types. This is in addition to the types' entries in
| || || ||OID of the range type|
| || || ||OID of the element type (subtype) of this range type|
| || || ||OID of the collation used for range comparisons, or 0 if none|
| || || ||OID of the subtype's operator class used for range comparisons|
| || || ||OID of the function to convert a range value into canonical form, or 0 if none|
| || || ||OID of the function to return the difference between two element values as |
rngcollation, if the element type is collatable) determines the sort ordering used by the range type.
rngcanonical is used when the element type is discrete.
rngsubdiff is optional but should be supplied to improve performance of GiST indexes on the range type.
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