c355f4003b
Add EXISTS clause support in IVM Correlated subqueries using EXISTS in WHERE clause are supported. An EXISTS subquery in WHERE clause is rewritten to LATERAL subquery in FROM clause, and IVM' process can handle this like as a normal join. Also, hidden columns "ivm_exists_count_X__" are added to check if EXISTS condition is satisfied. This column stores the count of how many rows in the subquery are correlated to (joined to) each row of the main query. When a base table contained in EXISTS clause is modified, this count value in IMMV is updated, and a row whose count becomes zero is deleted. restrictions : - EXISTS subqueries are allowed only in WHERE clause. - aggregate functions are not supported together with EXISTS. - EXISTS subqueries in a subquery are not supported. - EXISTS condition can use only with AND Expr
68 lines
2.3 KiB
C
68 lines
2.3 KiB
C
/*-------------------------------------------------------------------------
|
|
*
|
|
* pg_ivm.h
|
|
* incremental view maintenance extension
|
|
*
|
|
* Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
|
|
* Portions Copyright (c) 2022, IVM Development Group
|
|
*
|
|
*-------------------------------------------------------------------------
|
|
*/
|
|
|
|
#ifndef _PG_IVM_H_
|
|
#define _PG_IVM_H_
|
|
|
|
#include "catalog/objectaddress.h"
|
|
#include "fmgr.h"
|
|
#include "nodes/params.h"
|
|
#include "nodes/pathnodes.h"
|
|
#include "parser/parse_node.h"
|
|
#include "tcop/dest.h"
|
|
#include "utils/queryenvironment.h"
|
|
|
|
#define Natts_pg_ivm_immv 3
|
|
|
|
#define Anum_pg_ivm_immv_immvrelid 1
|
|
#define Anum_pg_ivm_immv_viewdef 2
|
|
#define Anum_pg_ivm_immv_ispopulated 3
|
|
|
|
/* pg_ivm.c */
|
|
|
|
extern void CreateChangePreventTrigger(Oid matviewOid);
|
|
extern Oid PgIvmImmvRelationId(void);
|
|
extern Oid PgIvmImmvPrimaryKeyIndexId(void);
|
|
extern bool isImmv(Oid immv_oid);
|
|
|
|
/* createas.c */
|
|
|
|
extern ObjectAddress ExecCreateImmv(ParseState *pstate, CreateTableAsStmt *stmt,
|
|
ParamListInfo params, QueryEnvironment *queryEnv,
|
|
QueryCompletion *qc);
|
|
extern void CreateIvmTriggersOnBaseTables(Query *qry, Oid matviewOid, bool is_create);
|
|
extern void CreateIndexOnIMMV(Query *query, Relation matviewRel, bool is_create);
|
|
extern Query *rewriteQueryForIMMV(Query *query, List *colNames);
|
|
extern void makeIvmAggColumn(ParseState *pstate, Aggref *aggref, char *resname, AttrNumber *next_resno, List **aggs);
|
|
|
|
/* matview.c */
|
|
|
|
extern Query *get_immv_query(Relation matviewRel);
|
|
extern ObjectAddress ExecRefreshImmv(const RangeVar *relation, bool skipData,
|
|
const char *queryString, QueryCompletion *qc);
|
|
extern bool ImmvIncrementalMaintenanceIsEnabled(void);
|
|
extern Query *get_immv_query(Relation matviewRel);
|
|
extern Datum IVM_immediate_before(PG_FUNCTION_ARGS);
|
|
extern Datum IVM_immediate_maintenance(PG_FUNCTION_ARGS);
|
|
extern Query* rewrite_query_for_exists_subquery(Query *query);
|
|
extern Datum ivm_visible_in_prestate(PG_FUNCTION_ARGS);
|
|
extern void AtAbort_IVM(void);
|
|
extern char *getColumnNameStartWith(RangeTblEntry *rte, char *str, int *attnum);
|
|
extern bool isIvmName(const char *s);
|
|
|
|
/* ruleutils.c */
|
|
|
|
extern char *pg_ivm_get_viewdef(Relation immvrel, bool pretty);
|
|
|
|
/* subselect.c */
|
|
extern void inline_cte(PlannerInfo *root, CommonTableExpr *cte);
|
|
|
|
#endif
|