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213 lines
6.7 KiB
C
213 lines
6.7 KiB
C
/*-------------------------------------------------------------------------
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*
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* pg_attribute.h
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* definition of the system "attribute" relation (pg_attribute)
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* along with the relation's initial contents.
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*
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*
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* Portions Copyright (c) 1996-2011, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/catalog/pg_attribute.h
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*
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* NOTES
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* the genbki.pl script reads this file and generates .bki
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* information from the DATA() statements.
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef PG_ATTRIBUTE_H
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#define PG_ATTRIBUTE_H
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#include "catalog/genbki.h"
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/* ----------------
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* pg_attribute definition. cpp turns this into
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* typedef struct FormData_pg_attribute
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*
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* If you change the following, make sure you change the structs for
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* system attributes in catalog/heap.c also.
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* You may need to change catalog/genbki.pl as well.
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* ----------------
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*/
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#define AttributeRelationId 1249
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#define AttributeRelation_Rowtype_Id 75
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CATALOG(pg_attribute,1249) BKI_BOOTSTRAP BKI_WITHOUT_OIDS BKI_ROWTYPE_OID(75) BKI_SCHEMA_MACRO
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{
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Oid attrelid; /* OID of relation containing this attribute */
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NameData attname; /* name of attribute */
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/*
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* atttypid is the OID of the instance in Catalog Class pg_type that
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* defines the data type of this attribute (e.g. int4). Information in
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* that instance is redundant with the attlen, attbyval, and attalign
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* attributes of this instance, so they had better match or Postgres will
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* fail.
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*/
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Oid atttypid;
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/*
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* attstattarget is the target number of statistics datapoints to collect
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* during VACUUM ANALYZE of this column. A zero here indicates that we do
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* not wish to collect any stats about this column. A "-1" here indicates
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* that no value has been explicitly set for this column, so ANALYZE
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* should use the default setting.
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*/
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int4 attstattarget;
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/*
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* attlen is a copy of the typlen field from pg_type for this attribute.
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* See atttypid comments above.
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*/
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int2 attlen;
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/*
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* attnum is the "attribute number" for the attribute: A value that
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* uniquely identifies this attribute within its class. For user
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* attributes, Attribute numbers are greater than 0 and not greater than
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* the number of attributes in the class. I.e. if the Class pg_class says
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* that Class XYZ has 10 attributes, then the user attribute numbers in
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* Class pg_attribute must be 1-10.
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*
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* System attributes have attribute numbers less than 0 that are unique
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* within the class, but not constrained to any particular range.
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*
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* Note that (attnum - 1) is often used as the index to an array.
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*/
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int2 attnum;
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/*
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* attndims is the declared number of dimensions, if an array type,
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* otherwise zero.
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*/
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int4 attndims;
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/*
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* fastgetattr() uses attcacheoff to cache byte offsets of attributes in
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* heap tuples. The value actually stored in pg_attribute (-1) indicates
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* no cached value. But when we copy these tuples into a tuple
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* descriptor, we may then update attcacheoff in the copies. This speeds
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* up the attribute walking process.
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*/
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int4 attcacheoff;
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/*
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* atttypmod records type-specific data supplied at table creation time
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* (for example, the max length of a varchar field). It is passed to
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* type-specific input and output functions as the third argument. The
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* value will generally be -1 for types that do not need typmod.
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*/
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int4 atttypmod;
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/*
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* attbyval is a copy of the typbyval field from pg_type for this
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* attribute. See atttypid comments above.
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*/
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bool attbyval;
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/*----------
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* attstorage tells for VARLENA attributes, what the heap access
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* methods can do to it if a given tuple doesn't fit into a page.
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* Possible values are
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* 'p': Value must be stored plain always
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* 'e': Value can be stored in "secondary" relation (if relation
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* has one, see pg_class.reltoastrelid)
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* 'm': Value can be stored compressed inline
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* 'x': Value can be stored compressed inline or in "secondary"
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* Note that 'm' fields can also be moved out to secondary storage,
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* but only as a last resort ('e' and 'x' fields are moved first).
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*----------
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*/
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char attstorage;
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/*
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* attalign is a copy of the typalign field from pg_type for this
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* attribute. See atttypid comments above.
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*/
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char attalign;
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/* This flag represents the "NOT NULL" constraint */
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bool attnotnull;
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/* Has DEFAULT value or not */
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bool atthasdef;
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/* Is dropped (ie, logically invisible) or not */
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bool attisdropped;
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/* Has a local definition (hence, do not drop when attinhcount is 0) */
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bool attislocal;
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/* Number of times inherited from direct parent relation(s) */
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int4 attinhcount;
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/* attribute's collation */
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Oid attcollation;
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/*
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* VARIABLE LENGTH FIELDS start here. These fields may be NULL, too.
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*
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* NOTE: the following fields are not present in tuple descriptors!
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*/
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/* Column-level access permissions */
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aclitem attacl[1];
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/* Column-level options */
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text attoptions[1];
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} FormData_pg_attribute;
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/*
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* ATTRIBUTE_FIXED_PART_SIZE is the size of the fixed-layout,
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* guaranteed-not-null part of a pg_attribute row. This is in fact as much
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* of the row as gets copied into tuple descriptors, so don't expect you
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* can access fields beyond attcollation except in a real tuple!
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*/
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#define ATTRIBUTE_FIXED_PART_SIZE \
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(offsetof(FormData_pg_attribute,attcollation) + sizeof(Oid))
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/* ----------------
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* Form_pg_attribute corresponds to a pointer to a tuple with
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* the format of pg_attribute relation.
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* ----------------
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*/
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typedef FormData_pg_attribute *Form_pg_attribute;
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/* ----------------
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* compiler constants for pg_attribute
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* ----------------
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*/
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#define Natts_pg_attribute 20
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#define Anum_pg_attribute_attrelid 1
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#define Anum_pg_attribute_attname 2
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#define Anum_pg_attribute_atttypid 3
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#define Anum_pg_attribute_attstattarget 4
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#define Anum_pg_attribute_attlen 5
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#define Anum_pg_attribute_attnum 6
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#define Anum_pg_attribute_attndims 7
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#define Anum_pg_attribute_attcacheoff 8
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#define Anum_pg_attribute_atttypmod 9
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#define Anum_pg_attribute_attbyval 10
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#define Anum_pg_attribute_attstorage 11
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#define Anum_pg_attribute_attalign 12
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#define Anum_pg_attribute_attnotnull 13
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#define Anum_pg_attribute_atthasdef 14
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#define Anum_pg_attribute_attisdropped 15
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#define Anum_pg_attribute_attislocal 16
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#define Anum_pg_attribute_attinhcount 17
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#define Anum_pg_attribute_attcollation 18
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#define Anum_pg_attribute_attacl 19
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#define Anum_pg_attribute_attoptions 20
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/* ----------------
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* initial contents of pg_attribute
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*
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* The initial contents of pg_attribute are generated at compile time by
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* genbki.pl. Only "bootstrapped" relations need be included.
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* ----------------
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*/
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#endif /* PG_ATTRIBUTE_H */
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