/*------------------------------------------------------------------------- * * index.c * code to create and destroy POSTGRES index relations * * Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * * * IDENTIFICATION * $Header: /cvsroot/pgsql/src/backend/catalog/index.c,v 1.215 2003/09/19 19:57:42 tgl Exp $ * * * INTERFACE ROUTINES * index_create() - Create a cataloged index relation * index_drop() - Removes index relation from catalogs * BuildIndexInfo() - Prepare to insert index tuples * FormIndexDatum() - Construct datum vector for one index tuple * *------------------------------------------------------------------------- */ #include "postgres.h" #include #include "access/genam.h" #include "access/heapam.h" #include "access/istrat.h" #include "bootstrap/bootstrap.h" #include "catalog/catalog.h" #include "catalog/catname.h" #include "catalog/dependency.h" #include "catalog/heap.h" #include "catalog/index.h" #include "catalog/indexing.h" #include "catalog/pg_constraint.h" #include "catalog/pg_index.h" #include "catalog/pg_opclass.h" #include "catalog/pg_proc.h" #include "catalog/pg_type.h" #include "executor/executor.h" #include "miscadmin.h" #include "optimizer/clauses.h" #include "optimizer/prep.h" #include "parser/parse_expr.h" #include "parser/parse_func.h" #include "storage/sinval.h" #include "storage/smgr.h" #include "utils/builtins.h" #include "utils/catcache.h" #include "utils/fmgroids.h" #include "utils/inval.h" #include "utils/lsyscache.h" #include "utils/relcache.h" #include "utils/syscache.h" /* * macros used in guessing how many tuples are on a page. */ #define AVG_ATTR_SIZE 8 #define NTUPLES_PER_PAGE(natts) \ ((BLCKSZ - MAXALIGN(sizeof(PageHeaderData))) / \ ((natts) * AVG_ATTR_SIZE + MAXALIGN(sizeof(HeapTupleHeaderData)))) /* non-export function prototypes */ static TupleDesc ConstructTupleDescriptor(Relation heapRelation, IndexInfo *indexInfo, Oid *classObjectId); static void UpdateRelationRelation(Relation indexRelation); static void InitializeAttributeOids(Relation indexRelation, int numatts, Oid indexoid); static void AppendAttributeTuples(Relation indexRelation, int numatts); static void UpdateIndexRelation(Oid indexoid, Oid heapoid, IndexInfo *indexInfo, Oid *classOids, bool primary); static Oid IndexGetRelation(Oid indexId); static bool reindexing = false; bool SetReindexProcessing(bool reindexmode) { bool old = reindexing; reindexing = reindexmode; return old; } bool IsReindexProcessing(void) { return reindexing; } /* * ConstructTupleDescriptor * * Build an index tuple descriptor for a new index */ static TupleDesc ConstructTupleDescriptor(Relation heapRelation, IndexInfo *indexInfo, Oid *classObjectId) { int numatts = indexInfo->ii_NumIndexAttrs; List *indexprs = indexInfo->ii_Expressions; TupleDesc heapTupDesc; TupleDesc indexTupDesc; int natts; /* #atts in heap rel --- for error checks */ int i; heapTupDesc = RelationGetDescr(heapRelation); natts = RelationGetForm(heapRelation)->relnatts; /* * allocate the new tuple descriptor */ indexTupDesc = CreateTemplateTupleDesc(numatts, false); /* * For simple index columns, we copy the pg_attribute row from the * parent relation and modify it as necessary. For expressions we * have to cons up a pg_attribute row the hard way. */ for (i = 0; i < numatts; i++) { AttrNumber atnum = indexInfo->ii_KeyAttrNumbers[i]; Form_pg_attribute to; HeapTuple tuple; Form_pg_type typeTup; Oid keyType; indexTupDesc->attrs[i] = to = (Form_pg_attribute) palloc0(ATTRIBUTE_TUPLE_SIZE); if (atnum != 0) { /* Simple index column */ Form_pg_attribute from; if (atnum < 0) { /* * here we are indexing on a system attribute (-1...-n) */ from = SystemAttributeDefinition(atnum, heapRelation->rd_rel->relhasoids); } else { /* * here we are indexing on a normal attribute (1...n) */ if (atnum > natts) /* safety check */ elog(ERROR, "invalid column number %d", atnum); from = heapTupDesc->attrs[AttrNumberGetAttrOffset(atnum)]; } /* * now that we've determined the "from", let's copy the tuple * desc data... */ memcpy(to, from, ATTRIBUTE_TUPLE_SIZE); /* * Fix the stuff that should not be the same as the underlying * attr */ to->attnum = i + 1; to->attstattarget = 0; to->attcacheoff = -1; to->attnotnull = false; to->atthasdef = false; to->attislocal = true; to->attinhcount = 0; } else { /* Expressional index */ Node *indexkey; if (indexprs == NIL) /* shouldn't happen */ elog(ERROR, "too few entries in indexprs list"); indexkey = (Node *) lfirst(indexprs); indexprs = lnext(indexprs); /* * Make the attribute's name "pg_expresssion_nnn" (maybe think * of something better later) */ sprintf(NameStr(to->attname), "pg_expression_%d", i + 1); /* * Lookup the expression type in pg_type for the type length * etc. */ keyType = exprType(indexkey); tuple = SearchSysCache(TYPEOID, ObjectIdGetDatum(keyType), 0, 0, 0); if (!HeapTupleIsValid(tuple)) elog(ERROR, "cache lookup failed for type %u", keyType); typeTup = (Form_pg_type) GETSTRUCT(tuple); /* * Assign some of the attributes values. Leave the rest as 0. */ to->attnum = i + 1; to->atttypid = keyType; to->attlen = typeTup->typlen; to->attbyval = typeTup->typbyval; to->attstorage = typeTup->typstorage; to->attalign = typeTup->typalign; to->attcacheoff = -1; to->atttypmod = -1; to->attislocal = true; ReleaseSysCache(tuple); } /* * We do not yet have the correct relation OID for the index, so * just set it invalid for now. InitializeAttributeOids() will * fix it later. */ to->attrelid = InvalidOid; /* * Check the opclass to see if it provides a keytype (overriding * the attribute type). */ tuple = SearchSysCache(CLAOID, ObjectIdGetDatum(classObjectId[i]), 0, 0, 0); if (!HeapTupleIsValid(tuple)) elog(ERROR, "cache lookup failed for opclass %u", classObjectId[i]); keyType = ((Form_pg_opclass) GETSTRUCT(tuple))->opckeytype; ReleaseSysCache(tuple); if (OidIsValid(keyType) && keyType != to->atttypid) { /* index value and heap value have different types */ tuple = SearchSysCache(TYPEOID, ObjectIdGetDatum(keyType), 0, 0, 0); if (!HeapTupleIsValid(tuple)) elog(ERROR, "cache lookup failed for type %u", keyType); typeTup = (Form_pg_type) GETSTRUCT(tuple); to->atttypid = keyType; to->atttypmod = -1; to->attlen = typeTup->typlen; to->attbyval = typeTup->typbyval; to->attalign = typeTup->typalign; to->attstorage = typeTup->typstorage; ReleaseSysCache(tuple); } } return indexTupDesc; } /* ---------------------------------------------------------------- * UpdateRelationRelation * ---------------------------------------------------------------- */ static void UpdateRelationRelation(Relation indexRelation) { Relation pg_class; HeapTuple tuple; pg_class = heap_openr(RelationRelationName, RowExclusiveLock); /* XXX Natts_pg_class_fixed is a hack - see pg_class.h */ tuple = heap_addheader(Natts_pg_class_fixed, true, CLASS_TUPLE_SIZE, (void *) indexRelation->rd_rel); /* * the new tuple must have the oid already chosen for the index. sure * would be embarrassing to do this sort of thing in polite company. */ HeapTupleSetOid(tuple, RelationGetRelid(indexRelation)); simple_heap_insert(pg_class, tuple); /* update the system catalog indexes */ CatalogUpdateIndexes(pg_class, tuple); heap_freetuple(tuple); heap_close(pg_class, RowExclusiveLock); } /* ---------------------------------------------------------------- * InitializeAttributeOids * ---------------------------------------------------------------- */ static void InitializeAttributeOids(Relation indexRelation, int numatts, Oid indexoid) { TupleDesc tupleDescriptor; int i; tupleDescriptor = RelationGetDescr(indexRelation); for (i = 0; i < numatts; i += 1) tupleDescriptor->attrs[i]->attrelid = indexoid; } /* ---------------------------------------------------------------- * AppendAttributeTuples * ---------------------------------------------------------------- */ static void AppendAttributeTuples(Relation indexRelation, int numatts) { Relation pg_attribute; CatalogIndexState indstate; TupleDesc indexTupDesc; HeapTuple new_tuple; int i; /* * open the attribute relation and its indexes */ pg_attribute = heap_openr(AttributeRelationName, RowExclusiveLock); indstate = CatalogOpenIndexes(pg_attribute); /* * insert data from new index's tupdesc into pg_attribute */ indexTupDesc = RelationGetDescr(indexRelation); for (i = 0; i < numatts; i++) { /* * There used to be very grotty code here to set these fields, but * I think it's unnecessary. They should be set already. */ Assert(indexTupDesc->attrs[i]->attnum == i + 1); Assert(indexTupDesc->attrs[i]->attcacheoff == -1); new_tuple = heap_addheader(Natts_pg_attribute, false, ATTRIBUTE_TUPLE_SIZE, (void *) indexTupDesc->attrs[i]); simple_heap_insert(pg_attribute, new_tuple); CatalogIndexInsert(indstate, new_tuple); heap_freetuple(new_tuple); } CatalogCloseIndexes(indstate); heap_close(pg_attribute, RowExclusiveLock); } /* ---------------------------------------------------------------- * UpdateIndexRelation * ---------------------------------------------------------------- */ static void UpdateIndexRelation(Oid indexoid, Oid heapoid, IndexInfo *indexInfo, Oid *classOids, bool primary) { int16 indkey[INDEX_MAX_KEYS]; Oid indclass[INDEX_MAX_KEYS]; Datum exprsDatum; Datum predDatum; Datum values[Natts_pg_index]; char nulls[Natts_pg_index]; Relation pg_index; HeapTuple tuple; int i; /* * Copy the index key and opclass info into zero-filled vectors */ MemSet(indkey, 0, sizeof(indkey)); MemSet(indclass, 0, sizeof(indclass)); for (i = 0; i < indexInfo->ii_NumIndexAttrs; i++) { indkey[i] = indexInfo->ii_KeyAttrNumbers[i]; indclass[i] = classOids[i]; } /* * Convert the index expressions (if any) to a text datum */ if (indexInfo->ii_Expressions != NIL) { char *exprsString; exprsString = nodeToString(indexInfo->ii_Expressions); exprsDatum = DirectFunctionCall1(textin, CStringGetDatum(exprsString)); pfree(exprsString); } else exprsDatum = (Datum) 0; /* * Convert the index predicate (if any) to a text datum */ if (indexInfo->ii_Predicate != NIL) { char *predString; predString = nodeToString(indexInfo->ii_Predicate); predDatum = DirectFunctionCall1(textin, CStringGetDatum(predString)); pfree(predString); } else predDatum = (Datum) 0; /* * open the system catalog index relation */ pg_index = heap_openr(IndexRelationName, RowExclusiveLock); /* * Build a pg_index tuple */ MemSet(nulls, ' ', sizeof(nulls)); values[Anum_pg_index_indexrelid - 1] = ObjectIdGetDatum(indexoid); values[Anum_pg_index_indrelid - 1] = ObjectIdGetDatum(heapoid); values[Anum_pg_index_indkey - 1] = PointerGetDatum(indkey); values[Anum_pg_index_indclass - 1] = PointerGetDatum(indclass); values[Anum_pg_index_indnatts - 1] = Int16GetDatum(indexInfo->ii_NumIndexAttrs); values[Anum_pg_index_indisunique - 1] = BoolGetDatum(indexInfo->ii_Unique); values[Anum_pg_index_indisprimary - 1] = BoolGetDatum(primary); values[Anum_pg_index_indisclustered - 1] = BoolGetDatum(false); values[Anum_pg_index_indexprs - 1] = exprsDatum; if (exprsDatum == (Datum) 0) nulls[Anum_pg_index_indexprs - 1] = 'n'; values[Anum_pg_index_indpred - 1] = predDatum; if (predDatum == (Datum) 0) nulls[Anum_pg_index_indpred - 1] = 'n'; tuple = heap_formtuple(RelationGetDescr(pg_index), values, nulls); /* * insert the tuple into the pg_index catalog */ simple_heap_insert(pg_index, tuple); /* update the indexes on pg_index */ CatalogUpdateIndexes(pg_index, tuple); /* * close the relation and free the tuple */ heap_close(pg_index, RowExclusiveLock); heap_freetuple(tuple); } /* ---------------------------------------------------------------- * index_create * * Returns OID of the created index. * ---------------------------------------------------------------- */ Oid index_create(Oid heapRelationId, const char *indexRelationName, IndexInfo *indexInfo, Oid accessMethodObjectId, Oid *classObjectId, bool primary, bool isconstraint, bool allow_system_table_mods) { Relation heapRelation; Relation indexRelation; TupleDesc indexTupDesc; bool shared_relation; Oid namespaceId; Oid indexoid; int i; SetReindexProcessing(false); /* * Only SELECT ... FOR UPDATE are allowed while doing this */ heapRelation = heap_open(heapRelationId, ShareLock); /* * The index will be in the same namespace as its parent table, and is * shared across databases if and only if the parent is. */ namespaceId = RelationGetNamespace(heapRelation); shared_relation = heapRelation->rd_rel->relisshared; /* * check parameters */ if (indexInfo->ii_NumIndexAttrs < 1) elog(ERROR, "must index at least one column"); if (!allow_system_table_mods && IsSystemRelation(heapRelation) && IsNormalProcessingMode()) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), errmsg("user-defined indexes on system catalogs are not supported"))); /* * We cannot allow indexing a shared relation after initdb (because * there's no way to make the entry in other databases' pg_class). * Unfortunately we can't distinguish initdb from a manually started * standalone backend. However, we can at least prevent this mistake * under normal multi-user operation. */ if (shared_relation && IsUnderPostmaster) ereport(ERROR, (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE), errmsg("shared indexes cannot be created after initdb"))); if (get_relname_relid(indexRelationName, namespaceId)) ereport(ERROR, (errcode(ERRCODE_DUPLICATE_TABLE), errmsg("relation \"%s\" already exists", indexRelationName))); /* * construct tuple descriptor for index tuples */ indexTupDesc = ConstructTupleDescriptor(heapRelation, indexInfo, classObjectId); /* * create the index relation's relcache entry and physical disk file. * (If we fail further down, it's the smgr's responsibility to remove * the disk file again.) */ indexRelation = heap_create(indexRelationName, namespaceId, indexTupDesc, shared_relation, true, allow_system_table_mods); /* Fetch the relation OID assigned by heap_create */ indexoid = RelationGetRelid(indexRelation); /* * Obtain exclusive lock on it. Although no other backends can see it * until we commit, this prevents deadlock-risk complaints from lock * manager in cases such as CLUSTER. */ LockRelation(indexRelation, AccessExclusiveLock); /* * Fill in fields of the index's pg_class entry that are not set * correctly by heap_create. * * XXX should have a cleaner way to create cataloged indexes */ indexRelation->rd_rel->relowner = GetUserId(); indexRelation->rd_rel->relam = accessMethodObjectId; indexRelation->rd_rel->relkind = RELKIND_INDEX; indexRelation->rd_rel->relhasoids = false; /* * store index's pg_class entry */ UpdateRelationRelation(indexRelation); /* * now update the object id's of all the attribute tuple forms in the * index relation's tuple descriptor */ InitializeAttributeOids(indexRelation, indexInfo->ii_NumIndexAttrs, indexoid); /* * append ATTRIBUTE tuples for the index */ AppendAttributeTuples(indexRelation, indexInfo->ii_NumIndexAttrs); /* ---------------- * update pg_index * (append INDEX tuple) * * Note that this stows away a representation of "predicate". * (Or, could define a rule to maintain the predicate) --Nels, Feb '92 * ---------------- */ UpdateIndexRelation(indexoid, heapRelationId, indexInfo, classObjectId, primary); /* * Register constraint and dependencies for the index. * * If the index is from a CONSTRAINT clause, construct a pg_constraint * entry. The index is then linked to the constraint, which in turn * is linked to the table. If it's not a CONSTRAINT, make the * dependency directly on the table. * * We don't need a dependency on the namespace, because there'll be an * indirect dependency via our parent table. * * During bootstrap we can't register any dependencies, and we don't try * to make a constraint either. */ if (!IsBootstrapProcessingMode()) { ObjectAddress myself, referenced; myself.classId = RelOid_pg_class; myself.objectId = indexoid; myself.objectSubId = 0; if (isconstraint) { char constraintType; Oid conOid; if (primary) constraintType = CONSTRAINT_PRIMARY; else if (indexInfo->ii_Unique) constraintType = CONSTRAINT_UNIQUE; else { elog(ERROR, "constraint must be PRIMARY or UNIQUE"); constraintType = 0; /* keep compiler quiet */ } /* Shouldn't have any expressions */ if (indexInfo->ii_Expressions) elog(ERROR, "constraints can't have index expressions"); conOid = CreateConstraintEntry(indexRelationName, namespaceId, constraintType, false, /* isDeferrable */ false, /* isDeferred */ heapRelationId, indexInfo->ii_KeyAttrNumbers, indexInfo->ii_NumIndexAttrs, InvalidOid, /* no domain */ InvalidOid, /* no foreign key */ NULL, 0, ' ', ' ', ' ', InvalidOid, /* no associated index */ NULL, /* no check constraint */ NULL, NULL); referenced.classId = get_system_catalog_relid(ConstraintRelationName); referenced.objectId = conOid; referenced.objectSubId = 0; recordDependencyOn(&myself, &referenced, DEPENDENCY_INTERNAL); } else { /* Create auto dependencies on simply-referenced columns */ for (i = 0; i < indexInfo->ii_NumIndexAttrs; i++) { if (indexInfo->ii_KeyAttrNumbers[i] != 0) { referenced.classId = RelOid_pg_class; referenced.objectId = heapRelationId; referenced.objectSubId = indexInfo->ii_KeyAttrNumbers[i]; recordDependencyOn(&myself, &referenced, DEPENDENCY_AUTO); } } } /* Store dependency on operator classes */ referenced.classId = get_system_catalog_relid(OperatorClassRelationName); for (i = 0; i < indexInfo->ii_NumIndexAttrs; i++) { referenced.objectId = classObjectId[i]; referenced.objectSubId = 0; recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL); } /* Store dependencies on anything mentioned in index expressions */ if (indexInfo->ii_Expressions) { recordDependencyOnSingleRelExpr(&myself, (Node *) indexInfo->ii_Expressions, heapRelationId, DEPENDENCY_NORMAL, DEPENDENCY_AUTO); } /* Store dependencies on anything mentioned in predicate */ if (indexInfo->ii_Predicate) { recordDependencyOnSingleRelExpr(&myself, (Node *) indexInfo->ii_Predicate, heapRelationId, DEPENDENCY_NORMAL, DEPENDENCY_AUTO); } } /* * Fill in the index strategy structure with information from the * catalogs. First we must advance the command counter so that we * will see the newly-entered index catalog tuples. */ CommandCounterIncrement(); RelationInitIndexAccessInfo(indexRelation); /* * If this is bootstrap (initdb) time, then we don't actually fill in * the index yet. We'll be creating more indexes and classes later, * so we delay filling them in until just before we're done with * bootstrapping. Otherwise, we call the routine that constructs the * index. * * In normal processing mode, the heap and index relations are closed by * index_build() --- but we continue to hold the ShareLock on the heap * and the exclusive lock on the index that we acquired above, until * end of transaction. */ if (IsBootstrapProcessingMode()) { index_register(heapRelationId, indexoid, indexInfo); /* XXX shouldn't we close the heap and index rels here? */ } else index_build(heapRelation, indexRelation, indexInfo); return indexoid; } /* * index_drop * * NOTE: this routine should now only be called through performDeletion(), * else associated dependencies won't be cleaned up. */ void index_drop(Oid indexId) { Oid heapId; Relation userHeapRelation; Relation userIndexRelation; Relation indexRelation; HeapTuple tuple; int i; Assert(OidIsValid(indexId)); /* * To drop an index safely, we must grab exclusive lock on its parent * table; otherwise there could be other backends using the index! * Exclusive lock on the index alone is insufficient because another * backend might be in the midst of devising a query plan that will * use the index. The parser and planner take care to hold an * appropriate lock on the parent table while working, but having them * hold locks on all the indexes too seems overly complex. We do grab * exclusive lock on the index too, just to be safe. Both locks must * be held till end of transaction, else other backends will still see * this index in pg_index. */ heapId = IndexGetRelation(indexId); userHeapRelation = heap_open(heapId, AccessExclusiveLock); userIndexRelation = index_open(indexId); LockRelation(userIndexRelation, AccessExclusiveLock); /* * fix RELATION relation */ DeleteRelationTuple(indexId); /* * fix ATTRIBUTE relation */ DeleteAttributeTuples(indexId); /* * fix INDEX relation */ indexRelation = heap_openr(IndexRelationName, RowExclusiveLock); tuple = SearchSysCache(INDEXRELID, ObjectIdGetDatum(indexId), 0, 0, 0); if (!HeapTupleIsValid(tuple)) elog(ERROR, "cache lookup failed for index %u", indexId); simple_heap_delete(indexRelation, &tuple->t_self); ReleaseSysCache(tuple); heap_close(indexRelation, RowExclusiveLock); /* * flush buffer cache and physically remove the file */ i = FlushRelationBuffers(userIndexRelation, (BlockNumber) 0); if (i < 0) elog(ERROR, "FlushRelationBuffers returned %d", i); smgrunlink(DEFAULT_SMGR, userIndexRelation); /* * We are presently too lazy to attempt to compute the new correct * value of relhasindex (the next VACUUM will fix it if necessary). So * there is no need to update the pg_class tuple for the owning * relation. But we must send out a shared-cache-inval notice on the * owning relation to ensure other backends update their relcache * lists of indexes. */ CacheInvalidateRelcache(heapId); /* * Close rels, but keep locks */ index_close(userIndexRelation); heap_close(userHeapRelation, NoLock); RelationForgetRelation(indexId); } /* ---------------------------------------------------------------- * index_build support * ---------------------------------------------------------------- */ /* ---------------- * BuildIndexInfo * Construct an IndexInfo record for an open index * * IndexInfo stores the information about the index that's needed by * FormIndexDatum, which is used for both index_build() and later insertion * of individual index tuples. Normally we build an IndexInfo for an index * just once per command, and then use it for (potentially) many tuples. * ---------------- */ IndexInfo * BuildIndexInfo(Relation index) { IndexInfo *ii = makeNode(IndexInfo); Form_pg_index indexStruct = index->rd_index; int i; int numKeys; /* check the number of keys, and copy attr numbers into the IndexInfo */ numKeys = indexStruct->indnatts; if (numKeys < 1 || numKeys > INDEX_MAX_KEYS) elog(ERROR, "invalid indnatts %d for index %u", numKeys, RelationGetRelid(index)); ii->ii_NumIndexAttrs = numKeys; for (i = 0; i < numKeys; i++) ii->ii_KeyAttrNumbers[i] = indexStruct->indkey[i]; /* fetch any expressions needed for expressional indexes */ ii->ii_Expressions = RelationGetIndexExpressions(index); ii->ii_ExpressionsState = NIL; /* fetch index predicate if any */ ii->ii_Predicate = RelationGetIndexPredicate(index); ii->ii_PredicateState = NIL; /* other info */ ii->ii_Unique = indexStruct->indisunique; return ii; } /* ---------------- * FormIndexDatum * Construct Datum[] and nullv[] arrays for a new index tuple. * * indexInfo Info about the index * heapTuple Heap tuple for which we must prepare an index entry * heapDescriptor tupledesc for heap tuple * estate executor state for evaluating any index expressions * datum Array of index Datums (output area) * nullv Array of is-null indicators (output area) * * When there are no index expressions, estate may be NULL. Otherwise it * must be supplied, *and* the ecxt_scantuple slot of its per-tuple expr * context must point to the heap tuple passed in. * * For largely historical reasons, we don't actually call index_formtuple() * here, we just prepare its input arrays datum[] and nullv[]. * ---------------- */ void FormIndexDatum(IndexInfo *indexInfo, HeapTuple heapTuple, TupleDesc heapDescriptor, EState *estate, Datum *datum, char *nullv) { List *indexprs; int i; if (indexInfo->ii_Expressions != NIL && indexInfo->ii_ExpressionsState == NIL) { /* First time through, set up expression evaluation state */ indexInfo->ii_ExpressionsState = (List *) ExecPrepareExpr((Expr *) indexInfo->ii_Expressions, estate); /* Check caller has set up context correctly */ Assert(GetPerTupleExprContext(estate)->ecxt_scantuple->val == heapTuple); } indexprs = indexInfo->ii_ExpressionsState; for (i = 0; i < indexInfo->ii_NumIndexAttrs; i++) { int keycol = indexInfo->ii_KeyAttrNumbers[i]; Datum iDatum; bool isNull; if (keycol != 0) { /* * Plain index column; get the value we need directly from the * heap tuple. */ iDatum = heap_getattr(heapTuple, keycol, heapDescriptor, &isNull); } else { /* * Index expression --- need to evaluate it. */ if (indexprs == NIL) elog(ERROR, "wrong number of index expressions"); iDatum = ExecEvalExprSwitchContext((ExprState *) lfirst(indexprs), GetPerTupleExprContext(estate), &isNull, NULL); indexprs = lnext(indexprs); } datum[i] = iDatum; nullv[i] = (isNull) ? 'n' : ' '; } if (indexprs != NIL) elog(ERROR, "wrong number of index expressions"); } /* --------------------------------------------- * Indexes of the relation active ? * * Caller must hold an adequate lock on the relation to ensure the * answer won't be changing. * --------------------------------------------- */ bool IndexesAreActive(Relation heaprel) { bool isactive; Relation indexRelation; HeapScanDesc scan; ScanKeyData entry; if (heaprel->rd_rel->relkind != RELKIND_RELATION && heaprel->rd_rel->relkind != RELKIND_TOASTVALUE) ereport(ERROR, (errcode(ERRCODE_WRONG_OBJECT_TYPE), errmsg("relation \"%s\" isn't an indexable relation", RelationGetRelationName(heaprel)))); /* If pg_class.relhasindex is set, indexes are active */ isactive = heaprel->rd_rel->relhasindex; if (isactive) return isactive; /* Otherwise, look to see if there are any indexes */ indexRelation = heap_openr(IndexRelationName, AccessShareLock); ScanKeyEntryInitialize(&entry, 0, Anum_pg_index_indrelid, F_OIDEQ, ObjectIdGetDatum(RelationGetRelid(heaprel))); scan = heap_beginscan(indexRelation, SnapshotNow, 1, &entry); if (heap_getnext(scan, ForwardScanDirection) == NULL) isactive = true; /* no indexes, so report "active" */ heap_endscan(scan); heap_close(indexRelation, AccessShareLock); return isactive; } /* ---------------- * set relhasindex of relation's pg_class entry * * If isprimary is TRUE, we are defining a primary index, so also set * relhaspkey to TRUE. Otherwise, leave relhaspkey alone. * * If reltoastidxid is not InvalidOid, also set reltoastidxid to that value. * This is only used for TOAST relations. * * NOTE: an important side-effect of this operation is that an SI invalidation * message is sent out to all backends --- including me --- causing relcache * entries to be flushed or updated with the new hasindex data. This must * happen even if we find that no change is needed in the pg_class row. * ---------------- */ void setRelhasindex(Oid relid, bool hasindex, bool isprimary, Oid reltoastidxid) { Relation pg_class; HeapTuple tuple; Form_pg_class classtuple; bool dirty = false; HeapScanDesc pg_class_scan = NULL; /* * Find the tuple to update in pg_class. */ pg_class = heap_openr(RelationRelationName, RowExclusiveLock); if (!IsIgnoringSystemIndexes() && (!IsReindexProcessing() || pg_class->rd_rel->relhasindex)) { tuple = SearchSysCacheCopy(RELOID, ObjectIdGetDatum(relid), 0, 0, 0); } else { ScanKeyData key[1]; ScanKeyEntryInitialize(&key[0], 0, ObjectIdAttributeNumber, F_OIDEQ, ObjectIdGetDatum(relid)); pg_class_scan = heap_beginscan(pg_class, SnapshotNow, 1, key); tuple = heap_getnext(pg_class_scan, ForwardScanDirection); } if (!HeapTupleIsValid(tuple)) elog(ERROR, "could not find tuple for relation %u", relid); /* * Update fields in the pg_class tuple. */ if (pg_class_scan) LockBuffer(pg_class_scan->rs_cbuf, BUFFER_LOCK_EXCLUSIVE); classtuple = (Form_pg_class) GETSTRUCT(tuple); if (classtuple->relhasindex != hasindex) { classtuple->relhasindex = hasindex; dirty = true; } if (isprimary) { if (!classtuple->relhaspkey) { classtuple->relhaspkey = true; dirty = true; } } if (OidIsValid(reltoastidxid)) { Assert(classtuple->relkind == RELKIND_TOASTVALUE); if (classtuple->reltoastidxid != reltoastidxid) { classtuple->reltoastidxid = reltoastidxid; dirty = true; } } if (pg_class_scan) LockBuffer(pg_class_scan->rs_cbuf, BUFFER_LOCK_UNLOCK); if (pg_class_scan) { /* Write the modified tuple in-place */ WriteNoReleaseBuffer(pg_class_scan->rs_cbuf); /* Send out shared cache inval if necessary */ if (!IsBootstrapProcessingMode()) CacheInvalidateHeapTuple(pg_class, tuple); BufferSync(); } else if (dirty) { simple_heap_update(pg_class, &tuple->t_self, tuple); /* Keep the catalog indexes up to date */ CatalogUpdateIndexes(pg_class, tuple); } else { /* no need to change tuple, but force relcache rebuild anyway */ CacheInvalidateRelcache(relid); } if (!pg_class_scan) heap_freetuple(tuple); else heap_endscan(pg_class_scan); heap_close(pg_class, RowExclusiveLock); } /* * setNewRelfilenode - assign a new relfilenode value to the relation * * Caller must already hold exclusive lock on the relation. */ void setNewRelfilenode(Relation relation) { Oid newrelfilenode; Relation pg_class; HeapTuple tuple; Form_pg_class rd_rel; HeapScanDesc pg_class_scan = NULL; bool in_place_upd; RelationData workrel; Assert(!IsSystemRelation(relation) || IsToastRelation(relation) || relation->rd_rel->relkind == RELKIND_INDEX); /* Allocate a new relfilenode */ newrelfilenode = newoid(); /* * Find the RELATION relation tuple for the given relation. */ pg_class = heap_openr(RelationRelationName, RowExclusiveLock); in_place_upd = IsIgnoringSystemIndexes(); if (!in_place_upd) { tuple = SearchSysCacheCopy(RELOID, ObjectIdGetDatum(RelationGetRelid(relation)), 0, 0, 0); } else { ScanKeyData key[1]; ScanKeyEntryInitialize(&key[0], 0, ObjectIdAttributeNumber, F_OIDEQ, ObjectIdGetDatum(RelationGetRelid(relation))); pg_class_scan = heap_beginscan(pg_class, SnapshotNow, 1, key); tuple = heap_getnext(pg_class_scan, ForwardScanDirection); } if (!HeapTupleIsValid(tuple)) elog(ERROR, "could not find tuple for relation %u", RelationGetRelid(relation)); rd_rel = (Form_pg_class) GETSTRUCT(tuple); /* schedule unlinking old relfilenode */ smgrunlink(DEFAULT_SMGR, relation); /* create another storage file. Is it a little ugly ? */ memcpy((char *) &workrel, relation, sizeof(RelationData)); workrel.rd_fd = -1; workrel.rd_node.relNode = newrelfilenode; heap_storage_create(&workrel); smgrclose(DEFAULT_SMGR, &workrel); /* update the pg_class row */ if (in_place_upd) { LockBuffer(pg_class_scan->rs_cbuf, BUFFER_LOCK_EXCLUSIVE); rd_rel->relfilenode = newrelfilenode; LockBuffer(pg_class_scan->rs_cbuf, BUFFER_LOCK_UNLOCK); WriteNoReleaseBuffer(pg_class_scan->rs_cbuf); BufferSync(); /* Send out shared cache inval if necessary */ if (!IsBootstrapProcessingMode()) CacheInvalidateHeapTuple(pg_class, tuple); } else { rd_rel->relfilenode = newrelfilenode; simple_heap_update(pg_class, &tuple->t_self, tuple); CatalogUpdateIndexes(pg_class, tuple); } if (!pg_class_scan) heap_freetuple(tuple); else heap_endscan(pg_class_scan); heap_close(pg_class, RowExclusiveLock); /* Make sure the relfilenode change is visible */ CommandCounterIncrement(); } /* ---------------- * UpdateStats * * Update pg_class' relpages and reltuples statistics for the given relation * (which can be either a table or an index). Note that this is not used * in the context of VACUUM. * ---------------- */ void UpdateStats(Oid relid, double reltuples) { Relation whichRel; Relation pg_class; HeapTuple tuple; BlockNumber relpages; Form_pg_class rd_rel; HeapScanDesc pg_class_scan = NULL; bool in_place_upd; /* * This routine handles updates for both the heap and index relation * statistics. In order to guarantee that we're able to *see* the * index relation tuple, we bump the command counter id here. The * index relation tuple was created in the current transaction. */ CommandCounterIncrement(); /* * CommandCounterIncrement() flushes invalid cache entries, including * those for the heap and index relations for which we're updating * statistics. Now that the cache is flushed, it's safe to open the * relation again. We need the relation open in order to figure out * how many blocks it contains. */ /* * Grabbing lock here is probably redundant ... */ whichRel = relation_open(relid, ShareLock); /* * Find the RELATION relation tuple for the given relation. */ pg_class = heap_openr(RelationRelationName, RowExclusiveLock); in_place_upd = (IsIgnoringSystemIndexes() || IsReindexProcessing()); if (!in_place_upd) { tuple = SearchSysCacheCopy(RELOID, ObjectIdGetDatum(relid), 0, 0, 0); } else { ScanKeyData key[1]; ScanKeyEntryInitialize(&key[0], 0, ObjectIdAttributeNumber, F_OIDEQ, ObjectIdGetDatum(relid)); pg_class_scan = heap_beginscan(pg_class, SnapshotNow, 1, key); tuple = heap_getnext(pg_class_scan, ForwardScanDirection); } if (!HeapTupleIsValid(tuple)) elog(ERROR, "could not find tuple for relation %u", relid); /* * Figure values to insert. * * If we found zero tuples in the scan, do NOT believe it; instead put a * bogus estimate into the statistics fields. Otherwise, the common * pattern "CREATE TABLE; CREATE INDEX; insert data" leaves the table * with zero size statistics until a VACUUM is done. The optimizer * will generate very bad plans if the stats claim the table is empty * when it is actually sizable. See also CREATE TABLE in heap.c. * * Note: this path is also taken during bootstrap, because bootstrap.c * passes reltuples = 0 after loading a table. We have to estimate * some number for reltuples based on the actual number of pages. */ relpages = RelationGetNumberOfBlocks(whichRel); if (reltuples == 0) { if (relpages == 0) { /* Bogus defaults for a virgin table, same as heap.c */ reltuples = 1000; relpages = 10; } else if (whichRel->rd_rel->relkind == RELKIND_INDEX && relpages <= 2) { /* Empty index, leave bogus defaults in place */ reltuples = 1000; } else reltuples = ((double) relpages) * NTUPLES_PER_PAGE(whichRel->rd_rel->relnatts); } /* * Update statistics in pg_class, if they changed. (Avoiding an * unnecessary update is not just a tiny performance improvement; it * also reduces the window wherein concurrent CREATE INDEX commands * may conflict.) */ rd_rel = (Form_pg_class) GETSTRUCT(tuple); if (rd_rel->relpages != (int32) relpages || rd_rel->reltuples != (float4) reltuples) { if (in_place_upd) { /* * At bootstrap time, we don't need to worry about concurrency * or visibility of changes, so we cheat. Also cheat if * REINDEX. */ LockBuffer(pg_class_scan->rs_cbuf, BUFFER_LOCK_EXCLUSIVE); rd_rel->relpages = (int32) relpages; rd_rel->reltuples = (float4) reltuples; LockBuffer(pg_class_scan->rs_cbuf, BUFFER_LOCK_UNLOCK); WriteNoReleaseBuffer(pg_class_scan->rs_cbuf); if (!IsBootstrapProcessingMode()) CacheInvalidateHeapTuple(pg_class, tuple); } else { /* During normal processing, must work harder. */ rd_rel->relpages = (int32) relpages; rd_rel->reltuples = (float4) reltuples; simple_heap_update(pg_class, &tuple->t_self, tuple); CatalogUpdateIndexes(pg_class, tuple); } } if (!pg_class_scan) heap_freetuple(tuple); else heap_endscan(pg_class_scan); /* * We shouldn't have to do this, but we do... Modify the reldesc in * place with the new values so that the cache contains the latest * copy. (XXX is this really still necessary? The relcache will get * fixed at next CommandCounterIncrement, so why bother here?) */ whichRel->rd_rel->relpages = (int32) relpages; whichRel->rd_rel->reltuples = (float4) reltuples; heap_close(pg_class, RowExclusiveLock); relation_close(whichRel, NoLock); } /* * index_build - invoke access-method-specific index build procedure */ void index_build(Relation heapRelation, Relation indexRelation, IndexInfo *indexInfo) { RegProcedure procedure; /* * sanity checks */ Assert(RelationIsValid(indexRelation)); Assert(PointerIsValid(indexRelation->rd_am)); procedure = indexRelation->rd_am->ambuild; Assert(RegProcedureIsValid(procedure)); /* * Call the access method's build procedure */ OidFunctionCall3(procedure, PointerGetDatum(heapRelation), PointerGetDatum(indexRelation), PointerGetDatum(indexInfo)); } /* * IndexBuildHeapScan - scan the heap relation to find tuples to be indexed * * This is called back from an access-method-specific index build procedure * after the AM has done whatever setup it needs. The parent heap relation * is scanned to find tuples that should be entered into the index. Each * such tuple is passed to the AM's callback routine, which does the right * things to add it to the new index. After we return, the AM's index * build procedure does whatever cleanup is needed; in particular, it should * close the heap and index relations. * * The total count of heap tuples is returned. This is for updating pg_class * statistics. (It's annoying not to be able to do that here, but we can't * do it until after the relation is closed.) Note that the index AM itself * must keep track of the number of index tuples; we don't do so here because * the AM might reject some of the tuples for its own reasons, such as being * unable to store NULLs. */ double IndexBuildHeapScan(Relation heapRelation, Relation indexRelation, IndexInfo *indexInfo, IndexBuildCallback callback, void *callback_state) { HeapScanDesc scan; HeapTuple heapTuple; TupleDesc heapDescriptor; Datum attdata[INDEX_MAX_KEYS]; char nulls[INDEX_MAX_KEYS]; double reltuples; List *predicate; TupleTable tupleTable; TupleTableSlot *slot; EState *estate; ExprContext *econtext; Snapshot snapshot; TransactionId OldestXmin; /* * sanity checks */ Assert(OidIsValid(indexRelation->rd_rel->relam)); heapDescriptor = RelationGetDescr(heapRelation); /* * Need an EState for evaluation of index expressions and * partial-index predicates. */ estate = CreateExecutorState(); econtext = GetPerTupleExprContext(estate); /* * If this is a predicate (partial) index, we will need to evaluate * the predicate using ExecQual, which requires the current tuple to * be in a slot of a TupleTable. Likewise if there are any * expressions. */ if (indexInfo->ii_Predicate != NIL || indexInfo->ii_Expressions != NIL) { tupleTable = ExecCreateTupleTable(1); slot = ExecAllocTableSlot(tupleTable); ExecSetSlotDescriptor(slot, heapDescriptor, false); /* Arrange for econtext's scan tuple to be the tuple under test */ econtext->ecxt_scantuple = slot; /* Set up execution state for predicate. */ predicate = (List *) ExecPrepareExpr((Expr *) indexInfo->ii_Predicate, estate); } else { tupleTable = NULL; slot = NULL; predicate = NIL; } /* * Ok, begin our scan of the base relation. We use SnapshotAny * because we must retrieve all tuples and do our own time qual * checks. */ if (IsBootstrapProcessingMode()) { snapshot = SnapshotNow; OldestXmin = InvalidTransactionId; } else { snapshot = SnapshotAny; OldestXmin = GetOldestXmin(heapRelation->rd_rel->relisshared); } scan = heap_beginscan(heapRelation, /* relation */ snapshot, /* seeself */ 0, /* number of keys */ (ScanKey) NULL); /* scan key */ reltuples = 0; /* * Scan all tuples in the base relation. */ while ((heapTuple = heap_getnext(scan, ForwardScanDirection)) != NULL) { bool tupleIsAlive; CHECK_FOR_INTERRUPTS(); if (snapshot == SnapshotAny) { /* do our own time qual check */ bool indexIt; uint16 sv_infomask; /* * HeapTupleSatisfiesVacuum may update tuple's hint status * bits. We could possibly get away with not locking the * buffer here, since caller should hold ShareLock on the * relation, but let's be conservative about it. */ LockBuffer(scan->rs_cbuf, BUFFER_LOCK_SHARE); sv_infomask = heapTuple->t_data->t_infomask; switch (HeapTupleSatisfiesVacuum(heapTuple->t_data, OldestXmin)) { case HEAPTUPLE_DEAD: indexIt = false; tupleIsAlive = false; break; case HEAPTUPLE_LIVE: indexIt = true; tupleIsAlive = true; break; case HEAPTUPLE_RECENTLY_DEAD: /* * If tuple is recently deleted then we must index it * anyway to keep VACUUM from complaining. */ indexIt = true; tupleIsAlive = false; break; case HEAPTUPLE_INSERT_IN_PROGRESS: /* * Since caller should hold ShareLock or better, we * should not see any tuples inserted by open * transactions --- unless it's our own transaction. * (Consider INSERT followed by CREATE INDEX within a * transaction.) */ if (!TransactionIdIsCurrentTransactionId( HeapTupleHeaderGetXmin(heapTuple->t_data))) elog(ERROR, "concurrent insert in progress"); indexIt = true; tupleIsAlive = true; break; case HEAPTUPLE_DELETE_IN_PROGRESS: /* * Since caller should hold ShareLock or better, we * should not see any tuples deleted by open * transactions --- unless it's our own transaction. * (Consider DELETE followed by CREATE INDEX within a * transaction.) */ if (!TransactionIdIsCurrentTransactionId( HeapTupleHeaderGetXmax(heapTuple->t_data))) elog(ERROR, "concurrent delete in progress"); indexIt = true; tupleIsAlive = false; break; default: elog(ERROR, "unexpected HeapTupleSatisfiesVacuum result"); indexIt = tupleIsAlive = false; /* keep compiler quiet */ break; } /* check for hint-bit update by HeapTupleSatisfiesVacuum */ if (sv_infomask != heapTuple->t_data->t_infomask) SetBufferCommitInfoNeedsSave(scan->rs_cbuf); LockBuffer(scan->rs_cbuf, BUFFER_LOCK_UNLOCK); if (!indexIt) continue; } else { /* heap_getnext did the time qual check */ tupleIsAlive = true; } reltuples += 1; MemoryContextReset(econtext->ecxt_per_tuple_memory); /* Set up for predicate or expression evaluation */ if (slot) ExecStoreTuple(heapTuple, slot, InvalidBuffer, false); /* * In a partial index, discard tuples that don't satisfy the * predicate. We can also discard recently-dead tuples, since * VACUUM doesn't complain about tuple count mismatch for partial * indexes. */ if (predicate != NIL) { if (!tupleIsAlive) continue; if (!ExecQual(predicate, econtext, false)) continue; } /* * For the current heap tuple, extract all the attributes we use * in this index, and note which are null. This also performs * evaluation of any expressions needed. */ FormIndexDatum(indexInfo, heapTuple, heapDescriptor, estate, attdata, nulls); /* * You'd think we should go ahead and build the index tuple here, * but some index AMs want to do further processing on the data * first. So pass the attdata and nulls arrays, instead. */ /* Call the AM's callback routine to process the tuple */ callback(indexRelation, heapTuple, attdata, nulls, tupleIsAlive, callback_state); } heap_endscan(scan); if (tupleTable) ExecDropTupleTable(tupleTable, true); FreeExecutorState(estate); /* These may have been pointing to the now-gone estate */ indexInfo->ii_ExpressionsState = NIL; indexInfo->ii_PredicateState = NIL; return reltuples; } /* * IndexGetRelation: given an index's relation OID, get the OID of the * relation it is an index on. Uses the system cache. */ static Oid IndexGetRelation(Oid indexId) { HeapTuple tuple; Form_pg_index index; Oid result; tuple = SearchSysCache(INDEXRELID, ObjectIdGetDatum(indexId), 0, 0, 0); if (!HeapTupleIsValid(tuple)) elog(ERROR, "cache lookup failed for index %u", indexId); index = (Form_pg_index) GETSTRUCT(tuple); Assert(index->indexrelid == indexId); result = index->indrelid; ReleaseSysCache(tuple); return result; } /* * reindex_index - This routine is used to recreate an index */ bool reindex_index(Oid indexId, bool force, bool inplace) { Relation iRel, heapRelation; IndexInfo *indexInfo; Oid heapId; bool old; /* * Open our index relation and get an exclusive lock on it. * * Note: doing this before opening the parent heap relation means there's * a possibility for deadlock failure against another xact that is * doing normal accesses to the heap and index. However, it's not * real clear why you'd be needing to do REINDEX on a table that's in * active use, so I'd rather have the protection of making sure the * index is locked down. */ iRel = index_open(indexId); LockRelation(iRel, AccessExclusiveLock); old = SetReindexProcessing(true); /* Get OID of index's parent table */ heapId = iRel->rd_index->indrelid; /* Open the parent heap relation */ heapRelation = heap_open(heapId, AccessExclusiveLock); /* * If it's a shared index, we must do inplace processing (because we * have no way to update relfilenode in other databases). Also, if * it's a nailed-in-cache index, we must do inplace processing because * the relcache can't cope with changing its relfilenode. * * In either of these cases, we are definitely processing a system index, * so we'd better be ignoring system indexes. (These checks are just * for paranoia's sake --- upstream code should have disallowed reindex * in such cases already.) */ if (iRel->rd_rel->relisshared) { if (!IsIgnoringSystemIndexes()) elog(ERROR, "must be ignoring system indexes to reindex shared index %u", indexId); inplace = true; } if (iRel->rd_isnailed) { if (!IsIgnoringSystemIndexes()) elog(ERROR, "must be ignoring system indexes to reindex nailed index %u", indexId); inplace = true; } /* Fetch info needed for index_build */ indexInfo = BuildIndexInfo(iRel); if (inplace) { /* * Release any buffers associated with this index. If they're * dirty, they're just dropped without bothering to flush to disk. */ DropRelationBuffers(iRel); /* Now truncate the actual data and set blocks to zero */ smgrtruncate(DEFAULT_SMGR, iRel, 0); iRel->rd_nblocks = 0; iRel->rd_targblock = InvalidBlockNumber; } else { /* * We'll build a new physical relation for the index. */ setNewRelfilenode(iRel); } /* Initialize the index and rebuild */ index_build(heapRelation, iRel, indexInfo); /* * index_build will close both the heap and index relations (but not * give up the locks we hold on them). So we're done. */ SetReindexProcessing(old); return true; } #ifdef NOT_USED /* * activate_indexes_of_a_table * activate/deactivate indexes of the specified table. * * Caller must already hold exclusive lock on the table. */ bool activate_indexes_of_a_table(Relation heaprel, bool activate) { if (IndexesAreActive(heaprel)) { if (!activate) setRelhasindex(RelationGetRelid(heaprel), false, false, InvalidOid); else return false; } else { if (activate) reindex_relation(RelationGetRelid(heaprel), false); else return false; } return true; } #endif /* NOT_USED */ /* * reindex_relation - This routine is used to recreate all indexes * of a relation. */ bool reindex_relation(Oid relid, bool force) { Relation indexRelation; ScanKeyData entry; HeapScanDesc scan; HeapTuple indexTuple; bool old, reindexed; bool overwrite; Relation rel; overwrite = false; /* * Ensure to hold an exclusive lock throughout the transaction. The * lock could be less intensive (in the non-overwrite path) but for * now it's AccessExclusiveLock for simplicity. */ rel = heap_open(relid, AccessExclusiveLock); /* * Should be ignoring system indexes if we are reindexing a system table. * (This is elog not ereport because caller should have caught it.) */ if (!IsIgnoringSystemIndexes() && IsSystemRelation(rel) && !IsToastRelation(rel)) elog(ERROR, "must be ignoring system indexes to reindex system table %u", relid); /* * Shared system indexes must be overwritten because it's impossible * to update pg_class tuples of all databases. */ if (rel->rd_rel->relisshared) { if (!IsIgnoringSystemIndexes()) /* shouldn't happen */ elog(ERROR, "must be ignoring system indexes to reindex shared table %u", relid); overwrite = true; } old = SetReindexProcessing(true); /* * Continue to hold the lock. */ heap_close(rel, NoLock); /* * Find table's indexes by looking in pg_index (not trusting indexes...) */ indexRelation = heap_openr(IndexRelationName, AccessShareLock); ScanKeyEntryInitialize(&entry, 0, Anum_pg_index_indrelid, F_OIDEQ, ObjectIdGetDatum(relid)); scan = heap_beginscan(indexRelation, SnapshotNow, 1, &entry); reindexed = false; while ((indexTuple = heap_getnext(scan, ForwardScanDirection)) != NULL) { Form_pg_index index = (Form_pg_index) GETSTRUCT(indexTuple); if (reindex_index(index->indexrelid, false, overwrite)) reindexed = true; else { reindexed = false; break; } } heap_endscan(scan); heap_close(indexRelation, AccessShareLock); SetReindexProcessing(old); return reindexed; }