diff options
Diffstat (limited to 'src/backend/catalog/pg_attribute.h')
| -rw-r--r-- | src/backend/catalog/pg_attribute.h | 102 |
1 files changed, 60 insertions, 42 deletions
diff --git a/src/backend/catalog/pg_attribute.h b/src/backend/catalog/pg_attribute.h index d8133177d52..4de58840052 100644 --- a/src/backend/catalog/pg_attribute.h +++ b/src/backend/catalog/pg_attribute.h @@ -7,7 +7,7 @@ * * Copyright (c) 1994, Regents of the University of California * - * $Id: pg_attribute.h,v 1.1.1.1 1996/07/09 06:21:16 scrappy Exp $ + * $Id: pg_attribute.h,v 1.2 1996/08/21 04:25:47 scrappy Exp $ * * NOTES * the genbki.sh script reads this file and generates .bki @@ -18,12 +18,6 @@ * these changes, be sure and change the appropriate Schema_xxx * macros! -cim 2/5/91 * - * fastgetattr() now uses attcacheoff to cache byte offsets of - * attributes in heap tuples. The data actually stored in - * pg_attribute (-1) indicates no cached value. But when we copy - * these tuples into a tuple descriptor, we may then update attcacheoff - * in the copies. This speeds up the attribute walking process. - * *------------------------------------------------------------------------- */ #ifndef PG_ATTRIBUTE_H @@ -54,15 +48,39 @@ CATALOG(pg_attribute) BOOTSTRAP { int4 attnvals; Oid atttyparg; /* type arg for arrays/spquel/procs */ int2 attlen; + /* attlen is the number of bytes we use to represent the value + of this attribute, e.g. 4 for an int4. But for a variable length + attribute, attlen is -1. + */ int2 attnum; + /* attnum is the "attribute number" for the attribute: A + value that uniquely identifies this attribute within its class. + For user attributes, Attribute numbers are greater than 0 and + not greater than the number of attributes in the class. + I.e. if the Class pg_class says that Class XYZ has 10 + attributes, then the user attribute numbers in Class + pg_attribute must be 1-10. + + System attributes have attribute numbers less than 0 that are + unique within the class, but not constrained to any particular range. + + Note that (attnum - 1) is often used as the index to an array. + */ int2 attbound; bool attbyval; bool attcanindex; Oid attproc; /* spquel? */ int4 attnelems; int4 attcacheoff; + /* fastgetattr() uses attcacheoff to cache byte offsets of + attributes in heap tuples. The data actually stored in + pg_attribute (-1) indicates no cached value. But when we + copy these tuples into a tuple descriptor, we may then update + attcacheoff in the copies. This speeds up the attribute + walking process. + */ bool attisset; - char attalign; /* alignment (c=char, s=short, i=int, d=double) */ + char attalign; /* alignment (c=char, s=short, i=int, d=double) */ } FormData_pg_attribute; /* @@ -380,43 +398,43 @@ DATA(insert OID = 0 ( 75 vtype 18 0 0 0 1 -11 0 t t 0 0 -1 f c)); * ---------------- */ #define Schema_pg_class \ -{ 83l, {"relname"}, 19l, 83l, 0l, 0l, NAMEDATALEN, 1, 0, '\0', '\001', 0l, 0l, -1l, '\0', 'i' }, \ -{ 83l, {"reltype"}, 26l, 83l, 0l, 0l, 4, 2, 0, '\001', '\001', 0l, 0l, -1l, '\0', 'i' }, \ -{ 83l, {"relowner"}, 26l, 83l, 0l, 0l, 4, 2, 0, '\001', '\001', 0l, 0l, -1l, '\0', 'i' }, \ -{ 83l, {"relam"}, 26l, 83l, 0l, 0l, 4, 3, 0, '\001', '\001', 0l, 0l, -1l, '\0', 'i' }, \ -{ 83l, {"relpages"}, 23, 83l, 0l, 0l, 4, 4, 0, '\001', '\001', 0l, 0l, -1l, '\0', 'i' }, \ -{ 83l, {"reltuples"}, 23, 83l, 0l, 0l, 4, 5, 0, '\001', '\001', 0l, 0l, -1l, '\0', 'i' }, \ -{ 83l, {"relexpires"}, 702, 83l, 0l, 0l, 4, 6, 0, '\001', '\001', 0l, 0l, -1l, '\0', 'i' }, \ -{ 83l, {"relpreserved"}, 703, 83l, 0l, 0l, 4, 7, 0, '\001', '\001', 0l, 0l, -1l, '\0', 'i' }, \ -{ 83l, {"relhasindex"}, 16, 83l, 0l, 0l, 1, 8, 0, '\001', '\001', 0l, 0l, -1l, '\0', 'c' }, \ -{ 83l, {"relisshared"}, 16, 83l, 0l, 0l, 1, 9, 0, '\001', '\001', 0l, 0l, -1l, '\0', 'c' }, \ -{ 83l, {"relkind"}, 18, 83l, 0l, 0l, 1, 10, 0, '\001', '\001', 0l, 0l, -1l, '\0', 'c' }, \ -{ 83l, {"relarch"}, 18, 83l, 0l, 0l, 1, 11, 0, '\001', '\001', 0l, 0l, -1l, '\0', 'c' }, \ -{ 83l, {"relnatts"}, 21, 83l, 0l, 0l, 2, 12, 0, '\001', '\001', 0l, 0l, -1l, '\0', 's' }, \ -{ 83l, {"relsmgr"}, 210l, 83l, 0l, 0l, 2, 13, 0, '\001', '\001', 0l, 0l, -1l, '\0', 's' }, \ -{ 83l, {"relkey"}, 22, 83l, 0l, 0l, 16, 14, 0, '\0', '\001', 0l, 0l, -1l, '\0', 'i' }, \ -{ 83l, {"relkeyop"}, 30, 83l, 0l, 0l, 32, 15, 0, '\0', '\001', 0l, 0l, -1l, '\0', 'i' }, \ -{ 83l, {"relhasrules"}, 16, 83l, 0l, 0l, 1, 16, 0, '\001', '\001', 0l, 0l, -1l, '\0', 'c' }, \ -{ 83l, {"relacl"}, 1034l, 83l, 0l, 0l, -1, 17, 0, '\0', '\001', 0l, 0l, -1l, '\0', 'i' } +{ 83l, {"relname"}, 19l, 83l, 0l, 0l, NAMEDATALEN, 1, 0, '\000', '\001', 0l, 0l, -1l, '\0', 'i' }, \ +{ 83l, {"reltype"}, 26l, 83l, 0l, 0l, 4, 2, 0, '\001', '\001', 0l, 0l, -1l, '\0', 'i' }, \ +{ 83l, {"relowner"}, 26l, 83l, 0l, 0l, 4, 3, 0, '\001', '\001', 0l, 0l, -1l, '\0', 'i' }, \ +{ 83l, {"relam"}, 26l, 83l, 0l, 0l, 4, 4, 0, '\001', '\001', 0l, 0l, -1l, '\0', 'i' }, \ +{ 83l, {"relpages"}, 23, 83l, 0l, 0l, 4, 5, 0, '\001', '\001', 0l, 0l, -1l, '\0', 'i' }, \ +{ 83l, {"reltuples"}, 23, 83l, 0l, 0l, 4, 6, 0, '\001', '\001', 0l, 0l, -1l, '\0', 'i' }, \ +{ 83l, {"relexpires"}, 702, 83l, 0l, 0l, 4, 7, 0, '\001', '\001', 0l, 0l, -1l, '\0', 'i' }, \ +{ 83l, {"relpreserved"}, 703, 83l, 0l, 0l, 4, 8, 0, '\001', '\001', 0l, 0l, -1l, '\0', 'i' }, \ +{ 83l, {"relhasindex"}, 16, 83l, 0l, 0l, 1, 9, 0, '\001', '\001', 0l, 0l, -1l, '\0', 'c' }, \ +{ 83l, {"relisshared"}, 16, 83l, 0l, 0l, 1, 10, 0, '\001', '\001', 0l, 0l, -1l, '\0', 'c' }, \ +{ 83l, {"relkind"}, 18, 83l, 0l, 0l, 1, 11, 0, '\001', '\001', 0l, 0l, -1l, '\0', 'c' }, \ +{ 83l, {"relarch"}, 18, 83l, 0l, 0l, 1, 12, 0, '\001', '\001', 0l, 0l, -1l, '\0', 'c' }, \ +{ 83l, {"relnatts"}, 21, 83l, 0l, 0l, 2, 13, 0, '\001', '\001', 0l, 0l, -1l, '\0', 's' }, \ +{ 83l, {"relsmgr"}, 210l, 83l, 0l, 0l, 2, 14, 0, '\001', '\001', 0l, 0l, -1l, '\0', 's' }, \ +{ 83l, {"relkey"}, 22, 83l, 0l, 0l, 16, 15, 0, '\000', '\001', 0l, 0l, -1l, '\0', 'i' }, \ +{ 83l, {"relkeyop"}, 30, 83l, 0l, 0l, 32, 16, 0, '\000', '\001', 0l, 0l, -1l, '\0', 'i' }, \ +{ 83l, {"relhasrules"}, 16, 83l, 0l, 0l, 1, 17, 0, '\001', '\001', 0l, 0l, -1l, '\0', 'c' }, \ +{ 83l, {"relacl"}, 1034l, 83l, 0l, 0l, -1, 18, 0, '\000', '\001', 0l, 0l, -1l, '\0', 'i' } DATA(insert OID = 0 ( 83 relname 19 0 0 0 NAMEDATALEN 1 0 f t 0 0 -1 f i)); DATA(insert OID = 0 ( 83 reltype 26 0 0 0 4 2 0 t t 0 0 -1 f i)); -DATA(insert OID = 0 ( 83 relowner 26 0 0 0 4 2 0 t t 0 0 -1 f i)); -DATA(insert OID = 0 ( 83 relam 26 0 0 0 4 3 0 t t 0 0 -1 f i)); -DATA(insert OID = 0 ( 83 relpages 23 0 0 0 4 4 0 t t 0 0 -1 f i)); -DATA(insert OID = 0 ( 83 reltuples 23 0 0 0 4 5 0 t t 0 0 -1 f i)); -DATA(insert OID = 0 ( 83 relexpires 702 0 0 0 4 6 0 t t 0 0 -1 f i)); -DATA(insert OID = 0 ( 83 relpreserved 702 0 0 0 4 7 0 t t 0 0 -1 f i)); -DATA(insert OID = 0 ( 83 relhasindex 16 0 0 0 1 8 0 t t 0 0 -1 f c)); -DATA(insert OID = 0 ( 83 relisshared 16 0 0 0 1 9 0 t t 0 0 -1 f c)); -DATA(insert OID = 0 ( 83 relkind 18 0 0 0 1 10 0 t t 0 0 -1 f c)); -DATA(insert OID = 0 ( 83 relarch 18 0 0 0 1 11 0 t t 0 0 -1 f c)); -DATA(insert OID = 0 ( 83 relnatts 21 0 0 0 2 12 0 t t 0 0 -1 f s)); -DATA(insert OID = 0 ( 83 relsmgr 210 0 0 0 2 13 0 t t 0 0 -1 f s)); -DATA(insert OID = 0 ( 83 relkey 22 0 0 0 16 14 0 f t 0 0 -1 f i)); -DATA(insert OID = 0 ( 83 relkeyop 30 0 0 0 32 15 0 f t 0 0 -1 f i)); -DATA(insert OID = 0 ( 83 relhasrules 16 0 0 0 1 16 0 t t 0 0 -1 f c)); -DATA(insert OID = 0 ( 83 relacl 1034 0 0 0 -1 17 0 f t 0 0 -1 f i)); +DATA(insert OID = 0 ( 83 relowner 26 0 0 0 4 3 0 t t 0 0 -1 f i)); +DATA(insert OID = 0 ( 83 relam 26 0 0 0 4 4 0 t t 0 0 -1 f i)); +DATA(insert OID = 0 ( 83 relpages 23 0 0 0 4 5 0 t t 0 0 -1 f i)); +DATA(insert OID = 0 ( 83 reltuples 23 0 0 0 4 6 0 t t 0 0 -1 f i)); +DATA(insert OID = 0 ( 83 relexpires 702 0 0 0 4 7 0 t t 0 0 -1 f i)); +DATA(insert OID = 0 ( 83 relpreserved 703 0 0 0 4 8 0 t t 0 0 -1 f i)); +DATA(insert OID = 0 ( 83 relhasindex 16 0 0 0 1 9 0 t t 0 0 -1 f c)); +DATA(insert OID = 0 ( 83 relisshared 16 0 0 0 1 10 0 t t 0 0 -1 f c)); +DATA(insert OID = 0 ( 83 relkind 18 0 0 0 1 11 0 t t 0 0 -1 f c)); +DATA(insert OID = 0 ( 83 relarch 18 0 0 0 1 12 0 t t 0 0 -1 f c)); +DATA(insert OID = 0 ( 83 relnatts 21 0 0 0 2 13 0 t t 0 0 -1 f s)); +DATA(insert OID = 0 ( 83 relsmgr 210 0 0 0 2 14 0 t t 0 0 -1 f s)); +DATA(insert OID = 0 ( 83 relkey 22 0 0 0 16 15 0 f t 0 0 -1 f i)); +DATA(insert OID = 0 ( 83 relkeyop 30 0 0 0 32 16 0 f t 0 0 -1 f i)); +DATA(insert OID = 0 ( 83 relhasrules 16 0 0 0 1 17 0 t t 0 0 -1 f c)); +DATA(insert OID = 0 ( 83 relacl 1034 0 0 0 -1 18 0 f t 0 0 -1 f i)); DATA(insert OID = 0 ( 83 ctid 27 0 0 0 6 -1 0 f t 0 0 -1 f i)); DATA(insert OID = 0 ( 83 oid 26 0 0 0 4 -2 0 t t 0 0 -1 f i)); DATA(insert OID = 0 ( 83 xmin 28 0 0 0 4 -3 0 f t 0 0 -1 f i)); |