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A materialized view has a rule just like a view and a heap and other physical properties like a table. The rule is only used to populate the table, references in queries refer to the materialized data. This is a minimal implementation, but should still be useful in many cases. Currently data is only populated "on demand" by the CREATE MATERIALIZED VIEW and REFRESH MATERIALIZED VIEW statements. It is expected that future releases will add incremental updates with various timings, and that a more refined concept of defining what is "fresh" data will be developed. At some point it may even be possible to have queries use a materialized in place of references to underlying tables, but that requires the other above-mentioned features to be working first. Much of the documentation work by Robert Haas. Review by Noah Misch, Thom Brown, Robert Haas, Marko Tiikkaja Security review by KaiGai Kohei, with a decision on how best to implement sepgsql still pending.
93 lines
3.0 KiB
C
93 lines
3.0 KiB
C
/*-------------------------------------------------------------------------
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*
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* explain.h
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* prototypes for explain.c
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*
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* Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994-5, Regents of the University of California
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*
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* src/include/commands/explain.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef EXPLAIN_H
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#define EXPLAIN_H
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#include "executor/executor.h"
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#include "lib/stringinfo.h"
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typedef enum ExplainFormat
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{
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EXPLAIN_FORMAT_TEXT,
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EXPLAIN_FORMAT_XML,
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EXPLAIN_FORMAT_JSON,
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EXPLAIN_FORMAT_YAML
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} ExplainFormat;
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typedef struct ExplainState
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{
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StringInfo str; /* output buffer */
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/* options */
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bool verbose; /* be verbose */
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bool analyze; /* print actual times */
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bool costs; /* print costs */
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bool buffers; /* print buffer usage */
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bool timing; /* print timing */
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ExplainFormat format; /* output format */
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/* other states */
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PlannedStmt *pstmt; /* top of plan */
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List *rtable; /* range table */
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List *rtable_names; /* alias names for RTEs */
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int indent; /* current indentation level */
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List *grouping_stack; /* format-specific grouping state */
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} ExplainState;
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/* Hook for plugins to get control in ExplainOneQuery() */
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typedef void (*ExplainOneQuery_hook_type) (Query *query,
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IntoClause *into,
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ExplainState *es,
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const char *queryString,
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ParamListInfo params);
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extern PGDLLIMPORT ExplainOneQuery_hook_type ExplainOneQuery_hook;
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/* Hook for plugins to get control in explain_get_index_name() */
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typedef const char *(*explain_get_index_name_hook_type) (Oid indexId);
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extern PGDLLIMPORT explain_get_index_name_hook_type explain_get_index_name_hook;
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extern void ExplainQuery(ExplainStmt *stmt, const char *queryString,
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ParamListInfo params, DestReceiver *dest);
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extern void ExplainInitState(ExplainState *es);
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extern TupleDesc ExplainResultDesc(ExplainStmt *stmt);
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extern void ExplainOneUtility(Node *utilityStmt, IntoClause *into,
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ExplainState *es,
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const char *queryString, ParamListInfo params);
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extern void ExplainOnePlan(PlannedStmt *plannedstmt, IntoClause *into,
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ExplainState *es, const char *queryString,
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DestReceiver *dest, ParamListInfo params);
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extern void ExplainPrintPlan(ExplainState *es, QueryDesc *queryDesc);
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extern void ExplainQueryText(ExplainState *es, QueryDesc *queryDesc);
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extern void ExplainBeginOutput(ExplainState *es);
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extern void ExplainEndOutput(ExplainState *es);
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extern void ExplainSeparatePlans(ExplainState *es);
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extern void ExplainPropertyList(const char *qlabel, List *data,
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ExplainState *es);
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extern void ExplainPropertyText(const char *qlabel, const char *value,
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ExplainState *es);
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extern void ExplainPropertyInteger(const char *qlabel, int value,
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ExplainState *es);
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extern void ExplainPropertyLong(const char *qlabel, long value,
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ExplainState *es);
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extern void ExplainPropertyFloat(const char *qlabel, double value, int ndigits,
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ExplainState *es);
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#endif /* EXPLAIN_H */
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