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hypopg_index.c
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hypopg_index.c
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/*-------------------------------------------------------------------------
*
* hypopg_index.c: Implementation of hypothetical indexes for PostgreSQL
*
* This file contains all the internal code related to hypothetical indexes
* support.
*
* This program is open source, licensed under the PostgreSQL license.
* For license terms, see the LICENSE file.
*
* Copyright (C) 2015-2022: Julien Rouhaud
*
*-------------------------------------------------------------------------
*/
#include <unistd.h>
#include <math.h>
#include "postgres.h"
#include "fmgr.h"
#include "funcapi.h"
#include "miscadmin.h"
#if PG_VERSION_NUM >= 90500
#include "access/brin.h"
#include "access/brin_page.h"
#include "access/brin_tuple.h"
#endif
#include "access/gist.h"
#if PG_VERSION_NUM >= 90300
#include "access/htup_details.h"
#endif
#include "access/nbtree.h"
#include "access/reloptions.h"
#include "access/spgist.h"
#include "access/spgist_private.h"
#include "access/sysattr.h"
#include "access/xlog.h"
#include "catalog/namespace.h"
#include "catalog/pg_am.h"
#include "catalog/pg_amproc.h"
#include "catalog/pg_class.h"
#include "catalog/pg_opclass.h"
#include "catalog/pg_type.h"
#include "commands/defrem.h"
#if PG_VERSION_NUM >= 120000
#include "nodes/makefuncs.h"
#endif
#include "optimizer/clauses.h"
#include "optimizer/cost.h"
#include "optimizer/pathnode.h"
#if PG_VERSION_NUM < 120000
#include "optimizer/var.h"
#else
#include "optimizer/optimizer.h"
#endif
#include "parser/parse_utilcmd.h"
#include "parser/parser.h"
#if PG_VERSION_NUM >= 120000
#include "port/pg_bitutils.h"
#endif
#include "storage/bufmgr.h"
#include "utils/builtins.h"
#include "utils/lsyscache.h"
#include "utils/rel.h"
#if PG_VERSION_NUM >= 90500
#include "utils/ruleutils.h"
#endif
#include "utils/syscache.h"
#include "include/hypopg.h"
#include "include/hypopg_index.h"
#if PG_VERSION_NUM >= 90600
/* this will be updated, when needed, by hypo_discover_am */
static Oid BLOOM_AM_OID = InvalidOid;
#endif
/*--- Variables exported ---*/
explain_get_index_name_hook_type prev_explain_get_index_name_hook;
List *hypoIndexes;
/*--- Functions --- */
PG_FUNCTION_INFO_V1(hypopg);
PG_FUNCTION_INFO_V1(hypopg_create_index);
PG_FUNCTION_INFO_V1(hypopg_drop_index);
PG_FUNCTION_INFO_V1(hypopg_relation_size);
PG_FUNCTION_INFO_V1(hypopg_get_indexdef);
PG_FUNCTION_INFO_V1(hypopg_reset_index);
static void hypo_addIndex(hypoIndex * entry);
static bool hypo_can_return(hypoIndex * entry, Oid atttype, int i, char *amname);
static void hypo_discover_am(char *amname, Oid oid);
static void hypo_estimate_index_simple(hypoIndex * entry,
BlockNumber *pages, double *tuples);
static void hypo_estimate_index(hypoIndex * entry, RelOptInfo *rel);
static int hypo_estimate_index_colsize(hypoIndex * entry, int col);
static void hypo_index_pfree(hypoIndex * entry);
static bool hypo_index_remove(Oid indexid);
static const hypoIndex *hypo_index_store_parsetree(IndexStmt *node,
const char *queryString);
static hypoIndex * hypo_newIndex(Oid relid, char *accessMethod, int nkeycolumns,
int ninccolumns,
List *options);
static void hypo_set_indexname(hypoIndex * entry, char *indexname);
/*
* palloc a new hypoIndex, and give it a new OID, and some other global stuff.
* This function also parse index storage options (if any) to check if they're
* valid.
*/
static hypoIndex *
hypo_newIndex(Oid relid, char *accessMethod, int nkeycolumns, int ninccolumns,
List *options)
{
/* must be declared "volatile", because used in a PG_CATCH() */
hypoIndex *volatile entry;
MemoryContext oldcontext;
HeapTuple tuple;
Oid oid;
#if PG_VERSION_NUM >= 90600
IndexAmRoutine *amroutine;
amoptions_function amoptions;
#else
RegProcedure amoptions;
#endif
tuple = SearchSysCache1(AMNAME, PointerGetDatum(accessMethod));
if (!HeapTupleIsValid(tuple))
{
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("hypopg: access method \"%s\" does not exist",
accessMethod)));
}
#if PG_VERSION_NUM < 120000
oid = HeapTupleGetOid(tuple);
#else
oid = ((Form_pg_am) GETSTRUCT(tuple))->oid;
#endif
hypo_discover_am(accessMethod, oid);
oldcontext = MemoryContextSwitchTo(HypoMemoryContext);
entry = palloc0(sizeof(hypoIndex));
entry->relam = oid;
#if PG_VERSION_NUM >= 90600
/*
* Since 9.6, AM informations are available through an amhandler function,
* returning an IndexAmRoutine containing what's needed.
*/
amroutine = GetIndexAmRoutine(((Form_pg_am) GETSTRUCT(tuple))->amhandler);
entry->amcostestimate = amroutine->amcostestimate;
entry->amcanreturn = amroutine->amcanreturn;
entry->amcanorderbyop = amroutine->amcanorderbyop;
entry->amoptionalkey = amroutine->amoptionalkey;
entry->amsearcharray = amroutine->amsearcharray;
entry->amsearchnulls = amroutine->amsearchnulls;
entry->amhasgettuple = (amroutine->amgettuple != NULL);
entry->amhasgetbitmap = (amroutine->amgetbitmap != NULL);
entry->amcanunique = amroutine->amcanunique;
entry->amcanmulticol = amroutine->amcanmulticol;
amoptions = amroutine->amoptions;
entry->amcanorder = amroutine->amcanorder;
#if PG_VERSION_NUM >= 110000
entry->amcanparallel = amroutine->amcanparallel;
entry->amcaninclude = amroutine->amcaninclude;
#endif
#else
/* Up to 9.5, all information is available in the pg_am tuple */
entry->amcostestimate = ((Form_pg_am) GETSTRUCT(tuple))->amcostestimate;
entry->amcanreturn = ((Form_pg_am) GETSTRUCT(tuple))->amcanreturn;
entry->amcanorderbyop = ((Form_pg_am) GETSTRUCT(tuple))->amcanorderbyop;
entry->amoptionalkey = ((Form_pg_am) GETSTRUCT(tuple))->amoptionalkey;
entry->amsearcharray = ((Form_pg_am) GETSTRUCT(tuple))->amsearcharray;
entry->amsearchnulls = ((Form_pg_am) GETSTRUCT(tuple))->amsearchnulls;
entry->amhasgettuple = OidIsValid(((Form_pg_am) GETSTRUCT(tuple))->amgettuple);
entry->amhasgetbitmap = OidIsValid(((Form_pg_am) GETSTRUCT(tuple))->amgetbitmap);
entry->amcanunique = ((Form_pg_am) GETSTRUCT(tuple))->amcanunique;
entry->amcanmulticol = ((Form_pg_am) GETSTRUCT(tuple))->amcanmulticol;
amoptions = ((Form_pg_am) GETSTRUCT(tuple))->amoptions;
entry->amcanorder = ((Form_pg_am) GETSTRUCT(tuple))->amcanorder;
#endif
ReleaseSysCache(tuple);
entry->indexname = palloc0(NAMEDATALEN);
/* palloc all arrays */
entry->indexkeys = palloc0(sizeof(short int) * (nkeycolumns + ninccolumns));
entry->indexcollations = palloc0(sizeof(Oid) * nkeycolumns);
entry->opfamily = palloc0(sizeof(Oid) * nkeycolumns);
entry->opclass = palloc0(sizeof(Oid) * nkeycolumns);
entry->opcintype = palloc0(sizeof(Oid) * nkeycolumns);
/* only palloc sort related fields if needed */
if ((entry->relam == BTREE_AM_OID) || (entry->amcanorder))
{
if (entry->relam != BTREE_AM_OID)
entry->sortopfamily = palloc0(sizeof(Oid) * nkeycolumns);
entry->reverse_sort = palloc0(sizeof(bool) * nkeycolumns);
entry->nulls_first = palloc0(sizeof(bool) * nkeycolumns);
}
else
{
entry->sortopfamily = NULL;
entry->reverse_sort = NULL;
entry->nulls_first = NULL;
}
#if PG_VERSION_NUM >= 90500
entry->canreturn = palloc0(sizeof(bool) * (nkeycolumns + ninccolumns));
#endif
entry->indexprs = NIL;
entry->indpred = NIL;
entry->options = (List *) copyObject(options);
MemoryContextSwitchTo(oldcontext);
entry->oid = hypo_getNewOid(relid);
entry->relid = relid;
entry->immediate = true;
if (options != NIL)
{
Datum reloptions;
/*
* Parse AM-specific options, convert to text array form, validate.
*/
reloptions = transformRelOptions((Datum) 0, options,
NULL, NULL, false, false);
(void) index_reloptions(amoptions, reloptions, true);
}
PG_TRY();
{
/*
* reject unsupported am. It could be done earlier but it's simpler
* (and was previously done) here.
*/
if (entry->relam != BTREE_AM_OID
#if PG_VERSION_NUM >= 90500
&& entry->relam != BRIN_AM_OID
#endif
#if PG_VERSION_NUM >= 90600
&& entry->relam != BLOOM_AM_OID
#endif
#if PG_VERSION_NUM >= 100000
/*
* Only support hash indexes for pg10+. In previous version they
* weren't crash safe, and changes in pg10+ also significantly
* changed the disk space allocation.
*/
&& entry->relam != HASH_AM_OID
#endif
)
{
/*
* do not store hypothetical indexes with access method not
* supported
*/
elog(ERROR, "hypopg: access method \"%s\" is not supported",
accessMethod);
break;
}
/* No more elog beyond this point. */
}
PG_CATCH();
{
/* Free what was palloc'd in HypoMemoryContext */
hypo_index_pfree(entry);
PG_RE_THROW();
}
PG_END_TRY();
return entry;
}
/* Add an hypoIndex to hypoIndexes */
static void
hypo_addIndex(hypoIndex * entry)
{
MemoryContext oldcontext;
oldcontext = MemoryContextSwitchTo(HypoMemoryContext);
hypoIndexes = lappend(hypoIndexes, entry);
MemoryContextSwitchTo(oldcontext);
}
/*
* Remove cleanly all hypothetical indexes by calling hypo_index_remove() on
* each entry. hypo_index_remove() function pfree all allocated memory
*/
void
hypo_index_reset(void)
{
ListCell *lc;
/*
* The cell is removed in hypo_index_remove(), so we can't iterate using
* standard foreach / lnext macros.
*/
while ((lc = list_head(hypoIndexes)) != NULL)
{
hypoIndex *entry = (hypoIndex *) lfirst(lc);
hypo_index_remove(entry->oid);
}
list_free(hypoIndexes);
hypoIndexes = NIL;
hypo_reset_fake_oids();
return;
}
/*
* 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 hypoIndex *
hypo_index_store_parsetree(IndexStmt *node, const char *queryString)
{
/* must be declared "volatile", because used in a PG_CATCH() */
hypoIndex *volatile entry;
Form_pg_attribute attform;
Oid relid;
StringInfoData indexRelationName;
int nkeycolumns,
ninccolumns;
ListCell *lc;
int attn;
/*
* Support for hypothetical BRIN indexes is broken in some minor versions
* of pg10, pg11 and pg12. For simplicity, check PG_VERSION_NUM rather
* than the real instance version, which should be right most of the
* time. When it's not, the only effect is to have a less user-friendly
* error message.
*/
#if ((PG_VERSION_NUM >= 100000 && PG_VERSION_NUM < 100012) || \
(PG_VERSION_NUM >= 110000 && PG_VERSION_NUM < 110007) || \
(PG_VERSION_NUM >= 120000 && PG_VERSION_NUM < 120002))
if (get_am_oid(node->accessMethod, true) == BRIN_AM_OID)
{
elog(ERROR, "hypopg: BRIN hypothetical indexes are only supported"
" with PostgreSQL "
#if PG_VERSION_NUM >= 120000
"12.2"
#else
#if PG_VERSION_NUM >= 110000
"11.7"
#else
"10.12"
#endif /* pg 11 */
#endif /* pg 12 */
" and later.");
}
#endif
relid = RangeVarGetRelid(node->relation, AccessShareLock, false);
/* Some sanity checks */
switch (get_rel_relkind(relid))
{
#if PG_VERSION_NUM >= 90300
case RELKIND_MATVIEW:
#endif
#if PG_VERSION_NUM >= 110000
case RELKIND_PARTITIONED_TABLE:
#endif
case RELKIND_RELATION:
/* this is supported */
break;
#if PG_VERSION_NUM >= 100000 && PG_VERSION_NUM < 110000
case RELKIND_PARTITIONED_TABLE:
elog(ERROR, "hypopg: cannot create hypothetical index on"
" partitioned table \"%s\"", node->relation->relname);
break;
#endif
default:
#if PG_VERSION_NUM >= 90300
elog(ERROR, "hypopg: \"%s\" is not a table or materialized view",
node->relation->relname);
#else
elog(ERROR, "hypopg: \"%s\" is not a table",
node->relation->relname);
#endif
}
/* Run parse analysis ... */
node = transformIndexStmt(relid, node, queryString);
nkeycolumns = list_length(node->indexParams);
#if PG_VERSION_NUM >= 110000
if (list_intersection(node->indexParams, node->indexIncludingParams) != NIL)
ereport(ERROR,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("hypopg: included columns must not intersect with key columns")));
ninccolumns = list_length(node->indexIncludingParams);
#else
ninccolumns = 0;
#endif
if (nkeycolumns > INDEX_MAX_KEYS)
elog(ERROR, "hypopg: cannot use more thant %d columns in an index",
INDEX_MAX_KEYS);
initStringInfo(&indexRelationName);
appendStringInfo(&indexRelationName, "%s", node->accessMethod);
appendStringInfo(&indexRelationName, "_");
if (node->relation->schemaname != NULL &&
(strcmp(node->relation->schemaname, "public") != 0))
{
appendStringInfo(&indexRelationName, "%s", node->relation->schemaname);
appendStringInfo(&indexRelationName, "_");
}
appendStringInfo(&indexRelationName, "%s", node->relation->relname);
/* now create the hypothetical index entry */
entry = hypo_newIndex(relid, node->accessMethod, nkeycolumns, ninccolumns,
node->options);
PG_TRY();
{
HeapTuple tuple;
int ind_avg_width = 0;
if (node->unique && !entry->amcanunique)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("hypopg: access method \"%s\" does not support unique indexes",
node->accessMethod)));
if (nkeycolumns > 1 && !entry->amcanmulticol)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("hypopg: access method \"%s\" does not support multicolumn indexes",
node->accessMethod)));
#if PG_VERSION_NUM >= 110000
if (node-> indexIncludingParams != NIL && !entry->amcaninclude)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("hypopg: access method \"%s\" does not support included columns",
node->accessMethod)));
#endif
entry->unique = node->unique;
entry->ncolumns = nkeycolumns + ninccolumns;
entry->nkeycolumns = nkeycolumns;
/* handle predicate if present */
if (node->whereClause)
{
MemoryContext oldcontext;
List *pred;
CheckPredicate((Expr *) node->whereClause);
pred = make_ands_implicit((Expr *) node->whereClause);
oldcontext = MemoryContextSwitchTo(HypoMemoryContext);
entry->indpred = (List *) copyObject(pred);
MemoryContextSwitchTo(oldcontext);
}
else
{
entry->indpred = NIL;
}
/*
* process attributeList
*/
attn = 0;
foreach(lc, node->indexParams)
{
IndexElem *attribute = (IndexElem *) lfirst(lc);
Oid atttype = InvalidOid;
Oid opclass;
appendStringInfo(&indexRelationName, "_");
/*
* Process the column-or-expression to be indexed.
*/
if (attribute->name != NULL)
{
/* Simple index attribute */
appendStringInfo(&indexRelationName, "%s", attribute->name);
/* get the attribute catalog info */
tuple = SearchSysCacheAttName(relid, attribute->name);
if (!HeapTupleIsValid(tuple))
{
elog(ERROR, "hypopg: column \"%s\" does not exist",
attribute->name);
}
attform = (Form_pg_attribute) GETSTRUCT(tuple);
/* setup the attnum */
entry->indexkeys[attn] = attform->attnum;
/* setup the collation */
entry->indexcollations[attn] = attform->attcollation;
/* get the atttype */
atttype = attform->atttypid;
ReleaseSysCache(tuple);
}
else
{
/*---------------------------
* handle index on expression
*
* Adapted from DefineIndex() and ComputeIndexAttrs()
*
* Statistics on expression index will be really wrong, since
* they're only computed when a real index exists (selectivity
* and average width).
*/
MemoryContext oldcontext;
Node *expr = attribute->expr;
Assert(expr != NULL);
entry->indexcollations[attn] = exprCollation(attribute->expr);
atttype = exprType(attribute->expr);
appendStringInfo(&indexRelationName, "expr");
/*
* Strip any top-level COLLATE clause. This ensures that we
* treat "x COLLATE y" and "(x COLLATE y)" alike.
*/
while (IsA(expr, CollateExpr))
expr = (Node *) ((CollateExpr *) expr)->arg;
if (IsA(expr, Var) &&
((Var *) expr)->varattno != InvalidAttrNumber)
{
/*
* User wrote "(column)" or "(column COLLATE something)".
* Treat it like simple attribute anyway.
*/
entry->indexkeys[attn] = ((Var *) expr)->varattno;
/*
* Generated index name will have _expr instead of attname
* in generated index name, and error message will also be
* slighty different in case on unexisting column from a
* simple attribute, but that's how ComputeIndexAttrs()
* proceed.
*/
}
else
{
/*
* transformExpr() should have already rejected
* subqueries, aggregates, and window functions, based on
* the EXPR_KIND_ for an index expression.
*/
/*
* An expression using mutable functions is probably
* wrong, since if you aren't going to get the same result
* for the same data every time, it's not clear what the
* index entries mean at all.
*/
if (CheckMutability((Expr *) expr))
ereport(ERROR,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("hypopg: functions in index expression must be marked IMMUTABLE")));
entry->indexkeys[attn] = 0; /* marks expression */
oldcontext = MemoryContextSwitchTo(HypoMemoryContext);
entry->indexprs = lappend(entry->indexprs,
(Node *) copyObject(attribute->expr));
MemoryContextSwitchTo(oldcontext);
}
}
ind_avg_width += hypo_estimate_index_colsize(entry, attn);
/*
* Apply collation override if any
*/
if (attribute->collation)
entry->indexcollations[attn] =
get_collation_oid(attribute->collation, false);
/*
* Check we have a collation iff it's a collatable type. The only
* expected failures here are (1) COLLATE applied to a
* noncollatable type, or (2) index expression had an unresolved
* collation. But we might as well code this to be a complete
* consistency check.
*/
if (type_is_collatable(atttype))
{
if (!OidIsValid(entry->indexcollations[attn]))
ereport(ERROR,
(errcode(ERRCODE_INDETERMINATE_COLLATION),
errmsg("hypopg: could not determine which collation to use for index expression"),
errhint("Use the COLLATE clause to set the collation explicitly.")));
}
else
{
if (OidIsValid(entry->indexcollations[attn]))
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("hypopg: collations are not supported by type %s",
format_type_be(atttype))));
}
/* get the opclass */
#if PG_VERSION_NUM < 100000
opclass = GetIndexOpClass(attribute->opclass,
atttype,
node->accessMethod,
entry->relam);
#else
opclass = ResolveOpClass(attribute->opclass,
atttype,
node->accessMethod,
entry->relam);
#endif
entry->opclass[attn] = opclass;
/* setup the opfamily */
entry->opfamily[attn] = get_opclass_family(opclass);
entry->opcintype[attn] = get_opclass_input_type(opclass);
/* setup the sort info if am handles it */
if (entry->amcanorder)
{
/* setup NULLS LAST, NULLS FIRST cases are handled below */
entry->nulls_first[attn] = false;
/* default ordering is ASC */
entry->reverse_sort[attn] = (attribute->ordering == SORTBY_DESC);
/* default null ordering is LAST for ASC, FIRST for DESC */
if (attribute->nulls_ordering == SORTBY_NULLS_DEFAULT)
{
if (attribute->ordering == SORTBY_DESC)
entry->nulls_first[attn] = true;
}
else if (attribute->nulls_ordering == SORTBY_NULLS_FIRST)
entry->nulls_first[attn] = true;
}
/* handle index-only scan info */
#if PG_VERSION_NUM < 90500
/*
* OIS info is global for the index before 9.5, so look for the
* information only once in that case.
*/
if (attn == 0)
{
/*
* specify first column, but it doesn't matter as this will
* only be used with GiST am, which cannot do IOS prior pg 9.5
*/
entry->canreturn = hypo_can_return(entry, atttype, 0,
node->accessMethod);
}
#else
/* per-column IOS information */
entry->canreturn[attn] = hypo_can_return(entry, atttype, attn,
node->accessMethod);
#endif
attn++;
}
Assert(attn == nkeycolumns);
/*
* We disallow indexes on system columns other than OID. They would
* not necessarily get updated correctly, and they don't seem useful
* anyway.
*/
for (attn = 0; attn < nkeycolumns; attn++)
{
AttrNumber attno = entry->indexkeys[attn];
if (attno < 0
#if PG_VERSION_NUM < 120000
&& attno != ObjectIdAttributeNumber
#endif
)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("hypopg: index creation on system columns is not supported")));
}
#if PG_VERSION_NUM >= 110000
attn = nkeycolumns;
foreach(lc, node->indexIncludingParams)
{
IndexElem *attribute = (IndexElem *) lfirst(lc);
Oid atttype = InvalidOid;
appendStringInfo(&indexRelationName, "_");
/* Handle not supported features as in ComputeIndexAttrs() */
if (attribute->collation)
ereport(ERROR,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("hypopg: including column does not support a collation")));
if (attribute->opclass)
ereport(ERROR,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("hypopg: including column does not support an operator class")));
if (attribute->ordering != SORTBY_DEFAULT)
ereport(ERROR,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("hypopg: including column does not support ASC/DESC options")));
if (attribute->nulls_ordering != SORTBY_NULLS_DEFAULT)
ereport(ERROR,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("hypopg: including column does not support NULLS FIRST/LAST options")));
/*
* Process the column-or-expression to be indexed.
*/
if (attribute->name != NULL)
{
/* Simple index attribute */
appendStringInfo(&indexRelationName, "%s", attribute->name);
/* get the attribute catalog info */
tuple = SearchSysCacheAttName(relid, attribute->name);
if (!HeapTupleIsValid(tuple))
{
elog(ERROR, "hypopg: column \"%s\" does not exist",
attribute->name);
}
attform = (Form_pg_attribute) GETSTRUCT(tuple);
/* setup the attnum */
entry->indexkeys[attn] = attform->attnum;
/* get the atttype */
atttype = attform->atttypid;
ReleaseSysCache(tuple);
}
else
{
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("hypopg: expressions are not supported in included columns")));
}
ind_avg_width += hypo_estimate_index_colsize(entry, attn);
/* per-column IOS information */
entry->canreturn[attn] = hypo_can_return(entry, atttype, attn,
node->accessMethod);
attn++;
}
Assert(attn == (nkeycolumns + ninccolumns));
#endif
/*
* Also check for system columns used in expressions or predicates.
*/
if (entry->indexprs || entry->indpred)
{
Bitmapset *indexattrs = NULL;
int i;
pull_varattnos((Node *) entry->indexprs, 1, &indexattrs);
pull_varattnos((Node *) entry->indpred, 1, &indexattrs);
for (i = FirstLowInvalidHeapAttributeNumber + 1; i < 0; i++)
{
if (
#if PG_VERSION_NUM < 120000
i != ObjectIdAttributeNumber &&
#endif
bms_is_member(i - FirstLowInvalidHeapAttributeNumber,
indexattrs))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("hypopg: index creation on system columns is not supported")));
}
}
/* Check if the average size fits in a btree index */
if (entry->relam == BTREE_AM_OID)
{
if (ind_avg_width >= HYPO_BTMaxItemSize)
ereport(ERROR,
(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
errmsg("hypopg: estimated index row size %d "
"exceeds maximum %ld",
ind_avg_width, HYPO_BTMaxItemSize),
errhint("Values larger than 1/3 of a buffer page "
"cannot be indexed.\nConsider a function index "
" of an MD5 hash of the value, or use full text "
"indexing\n(which is not yet supported by hypopg)."
)));
/* Warn about posssible error with a 80% avg size */
else if (ind_avg_width >= HYPO_BTMaxItemSize * .8)
ereport(WARNING,
(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
errmsg("hypopg: estimated index row size %d "
"is close to maximum %ld",
ind_avg_width, HYPO_BTMaxItemSize),
errhint("Values larger than 1/3 of a buffer page "
"cannot be indexed.\nConsider a function index "
" of an MD5 hash of the value, or use full text "
"indexing\n(which is not yet supported by hypopg)."
)));
}
/* No more elog beyond this point. */
}
PG_CATCH();
{
/* Free what was palloc'd in HypoMemoryContext */
hypo_index_pfree(entry);
PG_RE_THROW();
}
PG_END_TRY();
/*
* Fetch the ordering information for the index, if any. Adapted from
* plancat.c - get_relation_info().
*/
if ((entry->relam != BTREE_AM_OID) && entry->amcanorder)
{
/*
* Otherwise, identify the corresponding btree opfamilies by trying to
* map this index's "<" operators into btree. Since "<" uniquely
* defines the behavior of a sort order, this is a sufficient test.
*
* XXX This method is rather slow and also requires the undesirable
* assumption that the other index AM numbers its strategies the same
* as btree. It'd be better to have a way to explicitly declare the
* corresponding btree opfamily for each opfamily of the other index
* type. But given the lack of current or foreseeable amcanorder
* index types, it's not worth expending more effort on now.
*/
for (attn = 0; attn < nkeycolumns; attn++)
{
Oid ltopr;
Oid btopfamily;
Oid btopcintype;
int16 btstrategy;
ltopr = get_opfamily_member(entry->opfamily[attn],
entry->opcintype[attn],
entry->opcintype[attn],
BTLessStrategyNumber);
if (OidIsValid(ltopr) &&
get_ordering_op_properties(ltopr,
&btopfamily,
&btopcintype,
&btstrategy) &&
btopcintype == entry->opcintype[attn] &&
btstrategy == BTLessStrategyNumber)
{
/* Successful mapping */
entry->sortopfamily[attn] = btopfamily;
}
else
{
/* Fail ... quietly treat index as unordered */
/* also pfree allocated memory */
pfree(entry->sortopfamily);
pfree(entry->reverse_sort);
pfree(entry->nulls_first);
entry->sortopfamily = NULL;
entry->reverse_sort = NULL;
entry->nulls_first = NULL;
break;
}
}
}
hypo_set_indexname(entry, indexRelationName.data);
hypo_addIndex(entry);
return entry;
}
/*
* Remove an hypothetical index from the list of hypothetical indexes.
* pfree (by calling hypo_index_pfree) all memory that has been allocated.
*/
static bool
hypo_index_remove(Oid indexid)
{
ListCell *lc;
foreach(lc, hypoIndexes)
{
hypoIndex *entry = (hypoIndex *) lfirst(lc);
if (entry->oid == indexid)
{
hypoIndexes = list_delete_ptr(hypoIndexes, entry);
hypo_index_pfree(entry);
return true;
}
}
return false;
}
/* pfree all allocated memory for within an hypoIndex and the entry itself. */
static void
hypo_index_pfree(hypoIndex * entry)
{
/* pfree all memory that has been allocated */
pfree(entry->indexname);
pfree(entry->indexkeys);
pfree(entry->indexcollations);
pfree(entry->opfamily);
pfree(entry->opclass);
pfree(entry->opcintype);
if ((entry->relam == BTREE_AM_OID) || entry->amcanorder)
{
if ((entry->relam != BTREE_AM_OID) && entry->sortopfamily)
pfree(entry->sortopfamily);
if (entry->reverse_sort)
pfree(entry->reverse_sort);
if (entry->nulls_first)
pfree(entry->nulls_first);
}
if (entry->indexprs)
list_free_deep(entry->indexprs);
if (entry->indpred)
pfree(entry->indpred);
#if PG_VERSION_NUM >= 90500
pfree(entry->canreturn);
#endif
/* finally pfree the entry */
pfree(entry);
}
/*--------------------------------------------------
* Add an hypothetical index to the list of indexes.
* Caller should have check that the specified hypoIndex does belong to the
* 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 hypoIndex to the new IndexOptInfo. Every specific handling is
* done at store time (ie. hypo_index_store_parsetree). The only exception is
* the size estimation, recomputed verytime, as it needs up to date statistics.
*/
void
hypo_injectHypotheticalIndex(PlannerInfo *root,
Oid relationObjectId,
bool inhparent,
RelOptInfo *rel,
Relation relation,
hypoIndex * entry)
{
IndexOptInfo *index;
int ncolumns,
/*
* For convenience and readability, use nkeycolumns even for pg10-
* version. In this case, this var will be initialized to ncolumns
*/
nkeycolumns,
i;
/* create a node */
index = makeNode(IndexOptInfo);