b928e32774
Simple CTEs which does not contain aggregates or DISTINCT are now supported similarly to simple sub-queries. Before a view is maintained, all CTEs are converted to corresponding subqueries to enable to treat CTEs as same as subqueries. For this end, codes of the static function inline_cte in the core (optimizer/plan/subselect.c) was imported. Prohibit Unreferenced CTE is prohibited. When a table in a unreferenced CTE is TRUNCATEd, the contents of the IMMV is not affected so it must not be truncated. For confirming it at the maintenance time, we have to check if the modified table used in a CTE is actually referenced. Although it would possible, we just disallow to create such IMMVs for now since such unreferenced CTE is useless unless it doesn't contain modifying commands, that is already prohibited.
66 lines
2.1 KiB
C
66 lines
2.1 KiB
C
/*-------------------------------------------------------------------------
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*
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* pg_ivm.h
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* incremental view maintenance extension
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*
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* Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
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* Portions Copyright (c) 2022, IVM Development Group
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef _PG_IVM_H_
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#define _PG_IVM_H_
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#include "catalog/objectaddress.h"
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#include "fmgr.h"
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#include "nodes/params.h"
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#include "nodes/pathnodes.h"
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#include "parser/parse_node.h"
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#include "tcop/dest.h"
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#include "utils/queryenvironment.h"
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#define Natts_pg_ivm_immv 3
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#define Anum_pg_ivm_immv_immvrelid 1
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#define Anum_pg_ivm_immv_viewdef 2
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#define Anum_pg_ivm_immv_ispopulated 3
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/* pg_ivm.c */
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extern void CreateChangePreventTrigger(Oid matviewOid);
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extern Oid PgIvmImmvRelationId(void);
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extern Oid PgIvmImmvPrimaryKeyIndexId(void);
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extern bool isImmv(Oid immv_oid);
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/* createas.c */
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extern ObjectAddress ExecCreateImmv(ParseState *pstate, CreateTableAsStmt *stmt,
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ParamListInfo params, QueryEnvironment *queryEnv,
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QueryCompletion *qc);
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extern void CreateIvmTriggersOnBaseTables(Query *qry, Oid matviewOid, bool is_create);
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extern void CreateIndexOnIMMV(Query *query, Relation matviewRel, bool is_create);
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extern Query *rewriteQueryForIMMV(Query *query, List *colNames);
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extern void makeIvmAggColumn(ParseState *pstate, Aggref *aggref, char *resname, AttrNumber *next_resno, List **aggs);
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/* matview.c */
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extern Query *get_immv_query(Relation matviewRel);
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extern ObjectAddress ExecRefreshImmv(const RangeVar *relation, bool skipData,
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const char *queryString, QueryCompletion *qc);
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extern bool ImmvIncrementalMaintenanceIsEnabled(void);
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extern Query *get_immv_query(Relation matviewRel);
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extern Datum IVM_immediate_before(PG_FUNCTION_ARGS);
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extern Datum IVM_immediate_maintenance(PG_FUNCTION_ARGS);
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extern Datum ivm_visible_in_prestate(PG_FUNCTION_ARGS);
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extern void AtAbort_IVM(void);
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extern bool isIvmName(const char *s);
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/* ruleutils.c */
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extern char *pg_ivm_get_viewdef(Relation immvrel, bool pretty);
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/* subselect.c */
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extern void inline_cte(PlannerInfo *root, CommonTableExpr *cte);
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#endif
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