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578b229718
Previously tables declared WITH OIDS, including a significant fraction of the catalog tables, stored the oid column not as a normal column, but as part of the tuple header. This special column was not shown by default, which was somewhat odd, as it's often (consider e.g. pg_class.oid) one of the more important parts of a row. Neither pg_dump nor COPY included the contents of the oid column by default. The fact that the oid column was not an ordinary column necessitated a significant amount of special case code to support oid columns. That already was painful for the existing, but upcoming work aiming to make table storage pluggable, would have required expanding and duplicating that "specialness" significantly. WITH OIDS has been deprecated since 2005 (commit ff02d0a05280e0). Remove it. Removing includes: - CREATE TABLE and ALTER TABLE syntax for declaring the table to be WITH OIDS has been removed (WITH (oids[ = true]) will error out) - pg_dump does not support dumping tables declared WITH OIDS and will issue a warning when dumping one (and ignore the oid column). - restoring an pg_dump archive with pg_restore will warn when restoring a table with oid contents (and ignore the oid column) - COPY will refuse to load binary dump that includes oids. - pg_upgrade will error out when encountering tables declared WITH OIDS, they have to be altered to remove the oid column first. - Functionality to access the oid of the last inserted row (like plpgsql's RESULT_OID, spi's SPI_lastoid, ...) has been removed. The syntax for declaring a table WITHOUT OIDS (or WITH (oids = false) for CREATE TABLE) is still supported. While that requires a bit of support code, it seems unnecessary to break applications / dumps that do not use oids, and are explicit about not using them. The biggest user of WITH OID columns was postgres' catalog. This commit changes all 'magic' oid columns to be columns that are normally declared and stored. To reduce unnecessary query breakage all the newly added columns are still named 'oid', even if a table's column naming scheme would indicate 'reloid' or such. This obviously requires adapting a lot code, mostly replacing oid access via HeapTupleGetOid() with access to the underlying Form_pg_*->oid column. The bootstrap process now assigns oids for all oid columns in genbki.pl that do not have an explicit value (starting at the largest oid previously used), only oids assigned later by oids will be above FirstBootstrapObjectId. As the oid column now is a normal column the special bootstrap syntax for oids has been removed. Oids are not automatically assigned during insertion anymore, all backend code explicitly assigns oids with GetNewOidWithIndex(). For the rare case that insertions into the catalog via SQL are called for the new pg_nextoid() function can be used (which only works on catalog tables). The fact that oid columns on system tables are now normal columns means that they will be included in the set of columns expanded by * (i.e. SELECT * FROM pg_class will now include the table's oid, previously it did not). It'd not technically be hard to hide oid column by default, but that'd mean confusing behavior would either have to be carried forward forever, or it'd cause breakage down the line. While it's not unlikely that further adjustments are needed, the scope/invasiveness of the patch makes it worthwhile to get merge this now. It's painful to maintain externally, too complicated to commit after the code code freeze, and a dependency of a number of other patches. Catversion bump, for obvious reasons. Author: Andres Freund, with contributions by John Naylor Discussion: https://postgr.es/m/20180930034810.ywp2c7awz7opzcfr@alap3.anarazel.de
152 lines
4.6 KiB
C
152 lines
4.6 KiB
C
/*-------------------------------------------------------------------------
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*
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* heap.h
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* prototypes for functions in backend/catalog/heap.c
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*
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*
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* Portions Copyright (c) 1996-2018, 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/heap.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef HEAP_H
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#define HEAP_H
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#include "catalog/indexing.h"
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#include "catalog/objectaddress.h"
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#include "parser/parse_node.h"
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typedef struct RawColumnDefault
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{
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AttrNumber attnum; /* attribute to attach default to */
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Node *raw_default; /* default value (untransformed parse tree) */
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bool missingMode; /* true if part of add column processing */
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} RawColumnDefault;
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typedef struct CookedConstraint
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{
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ConstrType contype; /* CONSTR_DEFAULT or CONSTR_CHECK */
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Oid conoid; /* constr OID if created, otherwise Invalid */
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char *name; /* name, or NULL if none */
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AttrNumber attnum; /* which attr (only for DEFAULT) */
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Node *expr; /* transformed default or check expr */
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bool skip_validation; /* skip validation? (only for CHECK) */
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bool is_local; /* constraint has local (non-inherited) def */
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int inhcount; /* number of times constraint is inherited */
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bool is_no_inherit; /* constraint has local def and cannot be
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* inherited */
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} CookedConstraint;
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extern Relation heap_create(const char *relname,
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Oid relnamespace,
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Oid reltablespace,
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Oid relid,
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Oid relfilenode,
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TupleDesc tupDesc,
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char relkind,
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char relpersistence,
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bool shared_relation,
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bool mapped_relation,
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bool allow_system_table_mods);
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extern Oid heap_create_with_catalog(const char *relname,
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Oid relnamespace,
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Oid reltablespace,
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Oid relid,
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Oid reltypeid,
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Oid reloftypeid,
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Oid ownerid,
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TupleDesc tupdesc,
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List *cooked_constraints,
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char relkind,
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char relpersistence,
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bool shared_relation,
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bool mapped_relation,
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OnCommitAction oncommit,
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Datum reloptions,
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bool use_user_acl,
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bool allow_system_table_mods,
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bool is_internal,
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Oid relrewrite,
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ObjectAddress *typaddress);
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extern void heap_create_init_fork(Relation rel);
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extern void heap_drop_with_catalog(Oid relid);
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extern void heap_truncate(List *relids);
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extern void heap_truncate_one_rel(Relation rel);
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extern void heap_truncate_check_FKs(List *relations, bool tempTables);
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extern List *heap_truncate_find_FKs(List *relationIds);
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extern void InsertPgAttributeTuple(Relation pg_attribute_rel,
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Form_pg_attribute new_attribute,
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CatalogIndexState indstate);
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extern void InsertPgClassTuple(Relation pg_class_desc,
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Relation new_rel_desc,
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Oid new_rel_oid,
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Datum relacl,
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Datum reloptions);
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extern List *AddRelationNewConstraints(Relation rel,
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List *newColDefaults,
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List *newConstraints,
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bool allow_merge,
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bool is_local,
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bool is_internal,
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const char *queryString);
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extern void RelationClearMissing(Relation rel);
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extern void SetAttrMissing(Oid relid, char *attname, char *value);
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extern Oid StoreAttrDefault(Relation rel, AttrNumber attnum,
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Node *expr, bool is_internal,
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bool add_column_mode);
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extern Node *cookDefault(ParseState *pstate,
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Node *raw_default,
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Oid atttypid,
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int32 atttypmod,
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const char *attname);
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extern void DeleteRelationTuple(Oid relid);
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extern void DeleteAttributeTuples(Oid relid);
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extern void DeleteSystemAttributeTuples(Oid relid);
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extern void RemoveAttributeById(Oid relid, AttrNumber attnum);
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extern void RemoveAttrDefault(Oid relid, AttrNumber attnum,
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DropBehavior behavior, bool complain, bool internal);
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extern void RemoveAttrDefaultById(Oid attrdefId);
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extern void RemoveStatistics(Oid relid, AttrNumber attnum);
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extern const FormData_pg_attribute *SystemAttributeDefinition(AttrNumber attno);
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extern const FormData_pg_attribute *SystemAttributeByName(const char *attname);
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extern void CheckAttributeNamesTypes(TupleDesc tupdesc, char relkind,
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bool allow_system_table_mods);
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extern void CheckAttributeType(const char *attname,
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Oid atttypid, Oid attcollation,
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List *containing_rowtypes,
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bool allow_system_table_mods);
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/* pg_partitioned_table catalog manipulation functions */
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extern void StorePartitionKey(Relation rel,
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char strategy,
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int16 partnatts,
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AttrNumber *partattrs,
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List *partexprs,
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Oid *partopclass,
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Oid *partcollation);
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extern void RemovePartitionKeyByRelId(Oid relid);
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extern void StorePartitionBound(Relation rel, Relation parent,
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PartitionBoundSpec *bound);
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#endif /* HEAP_H */
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