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This commit is contained in:
Julien Rouhaud 2015-08-30 14:10:45 +02:00
parent 91461220f0
commit 87eb00478a
1 changed files with 18 additions and 7 deletions
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hypopg.c
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@ -64,10 +64,10 @@ bool isExplain = false;
/* GUC for enabling / disabling hypopg during EXPLAIN */
static bool hypo_is_enabled;
/*
/*--------------------------------------------------------
* Hypothetical index storage, pretty much an IndexOptInfo
* Some dynamic informations such as pages and lines are not storedn but
* computed when the hypothetical index is added.
* Some dynamic informations such as pages and lines are not stored but
* computed when the hypothetical index is used.
*/
typedef struct hypoEntry
{
@ -114,12 +114,14 @@ typedef struct hypoEntry
bool amsearchnulls; /* can AM search for NULL/NOT NULL entries? */
bool amhasgettuple; /* does AM have amgettuple interface? */
bool amhasgetbitmap; /* does AM have amgetbitmap interface? */
/* store some informations usually saved in catalogs */
List *options; /* WITH clause options: a list of DefElem */
bool amcanorder; /* does AM support order by column value? */
} hypoEntry;
/* List of hypothetic indexes for current backend */
List *entries = NIL;
@ -364,7 +366,8 @@ hypo_newEntry(Oid relid, char *accessMethod, int ncolumns, List *options)
return entry;
}
/* Wrapper around GetNewRelFileNode
/*---------------------------------
* Wrapper around GetNewRelFileNode
* Return a new OID for an hypothetical index.
*/
static Oid
@ -466,7 +469,10 @@ hypo_entry_store(Oid relid,
return entry;
}
/* Create an hypothetical index from its CREATE INDEX parsetree
/*
* Create an hypothetical index from its CREATE INDEX parsetree. This function
* is where all the hypothetic index creation is done, except the index size
* estimation.
*/
static const hypoEntry *
hypo_entry_store_parsetree(IndexStmt *node, const char *queryString)
@ -792,9 +798,14 @@ hypo_executorEnd_hook(QueryDesc *queryDesc)
standard_ExecutorEnd(queryDesc);
}
/* Add an hypothetical index to the list of indexes.
/*--------------------------------------------------
* Add an hypothetical index to the list of indexes.
* Caller should have check that the specified hypoEntry does belong to the
* specified relation
* specified relation. This function also assume that the specified entry
* already contains every needed information, so we just basically need to copy
* it from the hypoEntry to the new IndexOptInfo. Every specific handling is
* done at store time (ie. hypo_entry_store_parsetree). The only exception is
* the size estimation, recomputed verytime, as it needs up to date statistics.
*/
static void
hypo_injectHypotheticalIndex(PlannerInfo *root,