oid oid
Row identifier
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typname name
Data type name
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typnamespace oid
(references pg_namespace.oid)
The OID of the namespace that contains this type
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typowner oid
(references pg_authid.oid)
Owner of the type
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typlen int2
For a fixed-size type, typlen is the number
of bytes in the internal representation of the type. But for a
variable-length type, typlen is negative.
-1 indicates a “varlena” type (one that has a length word),
-2 indicates a null-terminated C string.
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typbyval bool
typbyval determines whether internal
routines pass a value of this type by value or by reference.
typbyval had better be false if
typlen is not 1, 2, or 4 (or 8 on machines
where Datum is 8 bytes).
Variable-length types are always passed by reference. Note that
typbyval can be false even if the
length would allow pass-by-value.
|
typtype char
typtype is
b for a base type,
c for a composite type (e.g., a table's row type),
d for a domain,
e for an enum type,
p for a pseudo-type,
r for a range type, or
m for a multirange type.
See also typrelid and
typbasetype.
|
typcategory char
typcategory is an arbitrary classification
of data types that is used by the parser to determine which implicit
casts should be “preferred”.
See Table 53.63.
|
typispreferred bool
True if the type is a preferred cast target within its
typcategory
|
typisdefined bool
True if the type is defined, false if this is a placeholder
entry for a not-yet-defined type. When
typisdefined is false, nothing
except the type name, namespace, and OID can be relied on.
|
typdelim char
Character that separates two values of this type when parsing
array input. Note that the delimiter is associated with the array
element data type, not the array data type.
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typrelid oid
(references pg_class.oid)
If this is a composite type (see
typtype), then this column points to
the pg_class entry that defines the
corresponding table. (For a free-standing composite type, the
pg_class entry doesn't really represent
a table, but it is needed anyway for the type's
pg_attribute entries to link to.)
Zero for non-composite types.
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typsubscript regproc
(references pg_proc.oid)
Subscripting handler function's OID, or zero if this type doesn't
support subscripting. Types that are “true” array
types have typsubscript
= array_subscript_handler, but other types may
have other handler functions to implement specialized subscripting
behavior.
|
typelem oid
(references pg_type.oid)
If typelem is not zero then it
identifies another row in pg_type,
defining the type yielded by subscripting. This should be zero
if typsubscript is zero. However, it can
be zero when typsubscript isn't zero, if the
handler doesn't need typelem to
determine the subscripting result type.
Note that a typelem dependency is
considered to imply physical containment of the element type in
this type; so DDL changes on the element type might be restricted
by the presence of this type.
|
typarray oid
(references pg_type.oid)
If typarray is not zero then it
identifies another row in pg_type, which
is the “true” array type having this type as element
|
typinput regproc
(references pg_proc.oid)
Input conversion function (text format)
|
typoutput regproc
(references pg_proc.oid)
Output conversion function (text format)
|
typreceive regproc
(references pg_proc.oid)
Input conversion function (binary format), or zero if none
|
typsend regproc
(references pg_proc.oid)
Output conversion function (binary format), or zero if none
|
typmodin regproc
(references pg_proc.oid)
Type modifier input function, or zero if type does not support modifiers
|
typmodout regproc
(references pg_proc.oid)
Type modifier output function, or zero to use the standard format
|
typanalyze regproc
(references pg_proc.oid)
Custom ANALYZE function,
or zero to use the standard function
|
typalign char
typalign is the alignment required
when storing a value of this type. It applies to storage on
disk as well as most representations of the value inside
PostgreSQL.
When multiple values are stored consecutively, such
as in the representation of a complete row on disk, padding is
inserted before a datum of this type so that it begins on the
specified boundary. The alignment reference is the beginning
of the first datum in the sequence.
Possible values are:
c = char alignment, i.e., no alignment needed.
s = short alignment (2 bytes on most machines).
i = int alignment (4 bytes on most machines).
d = double alignment (8 bytes on many machines, but by no means all).
|
typstorage char
typstorage tells for varlena
types (those with typlen = -1) if
the type is prepared for toasting and what the default strategy
for attributes of this type should be.
Possible values are:
p (plain): Values must always be stored plain
(non-varlena types always use this value).
e (external): Values can be stored in a
secondary “TOAST” relation (if relation has one, see
pg_class.reltoastrelid).
m (main): Values can be compressed and stored
inline.
x (extended): Values can be compressed and/or
moved to a secondary relation.
x is the usual choice for toast-able types.
Note that m values can also be moved out to
secondary storage, but only as a last resort (e
and x values are moved first).
|
typnotnull bool
typnotnull represents a not-null
constraint on a type. Used for domains only.
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typbasetype oid
(references pg_type.oid)
If this is a domain (see typtype), then
typbasetype identifies the type that this
one is based on. Zero if this type is not a domain.
|
typtypmod int4
Domains use typtypmod to record the typmod
to be applied to their base type (-1 if base type does not use a
typmod). -1 if this type is not a domain.
|
typndims int4
typndims is the number of array dimensions
for a domain over an array (that is, typbasetype is
an array type).
Zero for types other than domains over array types.
|
typcollation oid
(references pg_collation.oid)
typcollation specifies the collation
of the type. If the type does not support collations, this will
be zero. A base type that supports collations will have a nonzero
value here, typically DEFAULT_COLLATION_OID.
A domain over a collatable type can have a collation OID different
from its base type's, if one was specified for the domain.
|
typdefaultbin pg_node_tree
If typdefaultbin is not null, it is the
nodeToString()
representation of a default expression for the type. This is
only used for domains.
|
typdefault text
typdefault is null if the type has no associated
default value. If typdefaultbin is not null,
typdefault must contain a human-readable version of the
default expression represented by typdefaultbin. If
typdefaultbin is null and typdefault is
not, then typdefault is the external representation of
the type's default value, which can be fed to the type's input
converter to produce a constant.
|
typacl aclitem[]
Access privileges; see Section 5.7 for details
|