diff options
Diffstat (limited to 'src/include/catalog/pg_attribute.h')
| -rw-r--r-- | src/include/catalog/pg_attribute.h | 77 |
1 files changed, 44 insertions, 33 deletions
diff --git a/src/include/catalog/pg_attribute.h b/src/include/catalog/pg_attribute.h index 54f3adc9ee1..6edd86b1f2e 100644 --- a/src/include/catalog/pg_attribute.h +++ b/src/include/catalog/pg_attribute.h @@ -8,7 +8,7 @@ * Portions Copyright (c) 1996-2000, PostgreSQL, Inc * Portions Copyright (c) 1994, Regents of the University of California * - * $Id: pg_attribute.h,v 1.54 2000/03/09 05:00:26 inoue Exp $ + * $Id: pg_attribute.h,v 1.55 2000/04/12 17:16:28 momjian Exp $ * * NOTES * the genbki.sh script reads this file and generates .bki @@ -41,9 +41,11 @@ */ CATALOG(pg_attribute) BOOTSTRAP { - Oid attrelid; /* OID of relation containing this attribute */ + Oid attrelid; /* OID of relation containing this + * attribute */ NameData attname; Oid atttypid; + /* * atttypid is the OID of the instance in Catalog Class pg_type that * defines the data type of this attribute (e.g. int4). Information @@ -53,19 +55,21 @@ CATALOG(pg_attribute) BOOTSTRAP */ float4 attdisbursion; + /* - * attdisbursion is the disbursion statistic of the column (0.0 to 1.0), - * or zero if the statistic has not been calculated, or -1.0 - * if VACUUM found that the column contains no duplicate entries - * (in which case the disbursion should be taken as 1.0/numberOfRows - * for the current table size). The -1.0 hack is useful because the - * number of rows may be updated more often than attdisbursion is. - * We assume that the column will retain its no-duplicate-entry - * property. (Perhaps this should be driven off the existence of a - * UNIQUE index for the column, instead of being a statistical guess?) + * attdisbursion is the disbursion statistic of the column (0.0 to + * 1.0), or zero if the statistic has not been calculated, or -1.0 if + * VACUUM found that the column contains no duplicate entries (in + * which case the disbursion should be taken as 1.0/numberOfRows for + * the current table size). The -1.0 hack is useful because the + * number of rows may be updated more often than attdisbursion is. We + * assume that the column will retain its no-duplicate-entry property. + * (Perhaps this should be driven off the existence of a UNIQUE index + * for the column, instead of being a statistical guess?) */ int2 attlen; + /* * attlen is a copy of the typlen field from pg_type for this * attribute. See atttypid above. See struct Form_pg_type for @@ -73,6 +77,7 @@ CATALOG(pg_attribute) BOOTSTRAP */ int2 attnum; + /* * attnum is the "attribute number" for the attribute: A value that * uniquely identifies this attribute within its class. For user @@ -90,6 +95,7 @@ CATALOG(pg_attribute) BOOTSTRAP int4 attnelems; /* number of dimensions, if an array type */ int4 attcacheoff; + /* * fastgetattr() uses attcacheoff to cache byte offsets of attributes * in heap tuples. The value actually stored in pg_attribute (-1) @@ -99,36 +105,39 @@ CATALOG(pg_attribute) BOOTSTRAP */ int4 atttypmod; + /* - * atttypmod records type-specific data supplied at table creation time - * (for example, the max length of a varchar field). It is passed to - * type-specific input and output functions as the third argument. - * The value will generally be -1 for types that do not need typmod. + * atttypmod records type-specific data supplied at table creation + * time (for example, the max length of a varchar field). It is + * passed to type-specific input and output functions as the third + * argument. The value will generally be -1 for types that do not need + * typmod. */ bool attbyval; + /* * attbyval is a copy of the typbyval field from pg_type for this * attribute. See atttypid above. See struct Form_pg_type for * definition. */ - + char attstorage; + /* - * attstorage tells for VARLENA attributes, what the heap - * access methods can do to it if a given tuple doesn't fit into - * a page. Possible values are - * 'p': Value must be stored plain allways - * 'e': Value can be stored in "secondary" relation (if relation - * has rellongrelid attached) - * 'c': Value can be stored compressed inline - * 'x': Value can be stored compressed inline or in "secondary". + * attstorage tells for VARLENA attributes, what the heap access + * methods can do to it if a given tuple doesn't fit into a page. + * Possible values are 'p': Value must be stored plain allways 'e': + * Value can be stored in "secondary" relation (if relation has + * rellongrelid attached) 'c': Value can be stored compressed inline + * 'x': Value can be stored compressed inline or in "secondary". * * Note: compressed storage */ bool attisset; char attalign; + /* * attalign is a copy of the typalign field from pg_type for this * attribute. See atttypid above. See struct Form_pg_type for @@ -136,8 +145,10 @@ CATALOG(pg_attribute) BOOTSTRAP */ bool attnotnull; + /* This flag represents the "NOT NULL" constraint */ bool atthasdef; + /* Has DEFAULT value or not */ } FormData_pg_attribute; @@ -182,16 +193,16 @@ typedef FormData_pg_attribute *Form_pg_attribute; /* * CONSTANT and MACROS for DROP COLUMN implementation */ -#define DROP_COLUMN_OFFSET -20 -#define COLUMN_IS_DROPPED(attribute) ((attribute)->attnum <= DROP_COLUMN_OFFSET) -#define DROPPED_COLUMN_INDEX(attidx) (DROP_COLUMN_OFFSET - attidx) -#define ATTRIBUTE_DROP_COLUMN(attribute) \ +#define DROP_COLUMN_OFFSET -20 +#define COLUMN_IS_DROPPED(attribute) ((attribute)->attnum <= DROP_COLUMN_OFFSET) +#define DROPPED_COLUMN_INDEX(attidx) (DROP_COLUMN_OFFSET - attidx) +#define ATTRIBUTE_DROP_COLUMN(attribute) \ Assert((attribute)->attnum > 0); \ (attribute)->attnum = DROPPED_COLUMN_INDEX((attribute)->attnum); \ (attribute)->atttypid = (Oid) -1; \ (attribute)->attnotnull = false; \ - (attribute)->atthasdef = false; -#endif /* _DROP_COLUMN_HACK__ */ + (attribute)->atthasdef = false; +#endif /* _DROP_COLUMN_HACK__ */ /* ---------------- * SCHEMA_ macros for declaring hardcoded tuple descriptors. * these are used in utils/cache/relcache.c @@ -286,7 +297,7 @@ DATA(insert OID = 0 ( 1262 cmax 29 0 4 -6 0 -1 -1 t p f i f f)); { 1255, {"pronargs"}, 21, 0, 2, 7, 0, -1, -1, '\001', 'p', '\0', 's', '\0', '\0' }, \ { 1255, {"proretset"}, 16, 0, 1, 8, 0, -1, -1, '\001', 'p', '\0', 'c', '\0', '\0' }, \ { 1255, {"prorettype"}, 26, 0, 4, 9, 0, -1, -1, '\001', 'p', '\0', 'i', '\0', '\0' }, \ -{ 1255, {"proargtypes"}, 30, 0, INDEX_MAX_KEYS*4, 10, 0, -1, -1, '\0', 'p', '\0', 'i', '\0', '\0' }, \ +{ 1255, {"proargtypes"}, 30, 0, INDEX_MAX_KEYS*4, 10, 0, -1, -1, '\0', 'p', '\0', 'i', '\0', '\0' }, \ { 1255, {"probyte_pct"}, 23, 0, 4, 11, 0, -1, -1, '\001', 'p', '\0', 'i', '\0', '\0' }, \ { 1255, {"properbyte_cpu"}, 23, 0, 4, 12, 0, -1, -1, '\001', 'p', '\0', 'i', '\0', '\0' }, \ { 1255, {"propercall_cpu"}, 23, 0, 4, 13, 0, -1, -1, '\001', 'p', '\0', 'i', '\0', '\0' }, \ @@ -365,7 +376,7 @@ DATA(insert OID = 0 ( 1261 cmax 29 0 4 -6 0 -1 -1 t p f i f f)); { 1249, {"attcacheoff"}, 23, 0, 4, 8, 0, -1, -1, '\001', 'p', '\0', 'i', '\0', '\0' }, \ { 1249, {"atttypmod"}, 23, 0, 4, 9, 0, -1, -1, '\001', 'p', '\0', 'i', '\0', '\0' }, \ { 1249, {"attbyval"}, 16, 0, 1, 10, 0, -1, -1, '\001', 'p', '\0', 'c', '\0', '\0' }, \ -{ 1249, {"attstorage"}, 18, 0, 1, 11, 0, -1, -1, '\001', 'p', '\0', 'c', '\0', '\0' }, \ +{ 1249, {"attstorage"}, 18, 0, 1, 11, 0, -1, -1, '\001', 'p', '\0', 'c', '\0', '\0' }, \ { 1249, {"attisset"}, 16, 0, 1, 12, 0, -1, -1, '\001', 'p', '\0', 'c', '\0', '\0' }, \ { 1249, {"attalign"}, 18, 0, 1, 13, 0, -1, -1, '\001', 'p', '\0', 'c', '\0', '\0' }, \ { 1249, {"attnotnull"}, 16, 0, 1, 14, 0, -1, -1, '\001', 'p', '\0', 'c', '\0', '\0' }, \ @@ -490,7 +501,7 @@ DATA(insert OID = 0 ( 1219 tgconstrrelid 26 0 4 8 0 -1 -1 t p f i f f)); DATA(insert OID = 0 ( 1219 tgdeferrable 16 0 1 9 0 -1 -1 t p f c f f)); DATA(insert OID = 0 ( 1219 tginitdeferred 16 0 1 10 0 -1 -1 t p f c f f)); DATA(insert OID = 0 ( 1219 tgnargs 21 0 2 11 0 -1 -1 t p f s f f)); -DATA(insert OID = 0 ( 1219 tgattr 22 0 INDEX_MAX_KEYS*2 12 0 -1 -1 f p f i f f)); +DATA(insert OID = 0 ( 1219 tgattr 22 0 INDEX_MAX_KEYS*2 12 0 -1 -1 f p f i f f)); DATA(insert OID = 0 ( 1219 tgargs 17 0 -1 13 0 -1 -1 f p f i f f)); DATA(insert OID = 0 ( 1219 ctid 27 0 6 -1 0 -1 -1 f p f i f f)); DATA(insert OID = 0 ( 1219 oid 26 0 4 -2 0 -1 -1 t p f i f f)); |