index.h

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/*-------------------------------------------------------------------------
 *
 * index.h
 *    prototypes for catalog/index.c.
 *
 *
 * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/catalog/index.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef INDEX_H
#define INDEX_H
 
#include "catalog/objectaddress.h"
#include "nodes/execnodes.h"
 
 
#define DEFAULT_INDEX_TYPE  "btree"
 
/* Action code for index_set_state_flags */
typedef enum
{
    INDEX_CREATE_SET_READY,
    INDEX_CREATE_SET_VALID,
    INDEX_DROP_CLEAR_VALID,
    INDEX_DROP_SET_DEAD,
} IndexStateFlagsAction;
 
/* options for REINDEX */
typedef struct ReindexParams
{
    bits32      options;        /* bitmask of REINDEXOPT_* */
    Oid         tablespaceOid;  /* New tablespace to move indexes to.
                                 * InvalidOid to do nothing. */
} ReindexParams;
 
/* flag bits for ReindexParams->flags */
#define REINDEXOPT_VERBOSE      0x01    /* print progress info */
#define REINDEXOPT_REPORT_PROGRESS 0x02 /* report pgstat progress */
#define REINDEXOPT_MISSING_OK   0x04    /* skip missing relations */
#define REINDEXOPT_CONCURRENTLY 0x08    /* concurrent mode */
 
/* state info for validate_index bulkdelete callback */
typedef struct ValidateIndexState
{
    Tuplesortstate *tuplesort;  /* for sorting the index TIDs */
    /* statistics (for debug purposes only): */
    double      htups,
                itups,
                tups_inserted;
} ValidateIndexState;
 
extern void index_check_primary_key(Relation heapRel,
                                    const IndexInfo *indexInfo,
                                    bool is_alter_table,
                                    const IndexStmt *stmt);
 
#define INDEX_CREATE_IS_PRIMARY             (1 << 0)
#define INDEX_CREATE_ADD_CONSTRAINT         (1 << 1)
#define INDEX_CREATE_SKIP_BUILD             (1 << 2)
#define INDEX_CREATE_CONCURRENT             (1 << 3)
#define INDEX_CREATE_IF_NOT_EXISTS          (1 << 4)
#define INDEX_CREATE_PARTITIONED            (1 << 5)
#define INDEX_CREATE_INVALID                (1 << 6)
 
extern Oid  index_create(Relation heapRelation,
                         const char *indexRelationName,
                         Oid indexRelationId,
                         Oid parentIndexRelid,
                         Oid parentConstraintId,
                         RelFileNumber relFileNumber,
                         IndexInfo *indexInfo,
                         const List *indexColNames,
                         Oid accessMethodId,
                         Oid tableSpaceId,
                         const Oid *collationIds,
                         const Oid *opclassIds,
                         const Datum *opclassOptions,
                         const int16 *coloptions,
                         const NullableDatum *stattargets,
                         Datum reloptions,
                         bits16 flags,
                         bits16 constr_flags,
                         bool allow_system_table_mods,
                         bool is_internal,
                         Oid *constraintId);
 
#define INDEX_CONSTR_CREATE_MARK_AS_PRIMARY (1 << 0)
#define INDEX_CONSTR_CREATE_DEFERRABLE      (1 << 1)
#define INDEX_CONSTR_CREATE_INIT_DEFERRED   (1 << 2)
#define INDEX_CONSTR_CREATE_UPDATE_INDEX    (1 << 3)
#define INDEX_CONSTR_CREATE_REMOVE_OLD_DEPS (1 << 4)
#define INDEX_CONSTR_CREATE_WITHOUT_OVERLAPS (1 << 5)
 
extern Oid  index_concurrently_create_copy(Relation heapRelation,
                                           Oid oldIndexId,
                                           Oid tablespaceOid,
                                           const char *newName);
 
extern void index_concurrently_build(Oid heapRelationId,
                                     Oid indexRelationId);
 
extern void index_concurrently_swap(Oid newIndexId,
                                    Oid oldIndexId,
                                    const char *oldName);
 
extern void index_concurrently_set_dead(Oid heapId,
                                        Oid indexId);
 
extern ObjectAddress index_constraint_create(Relation heapRelation,
                                             Oid indexRelationId,
                                             Oid parentConstraintId,
                                             const IndexInfo *indexInfo,
                                             const char *constraintName,
                                             char constraintType,
                                             bits16 constr_flags,
                                             bool allow_system_table_mods,
                                             bool is_internal);
 
extern void index_drop(Oid indexId, bool concurrent, bool concurrent_lock_mode);
 
extern IndexInfo *BuildIndexInfo(Relation index);
 
extern IndexInfo *BuildDummyIndexInfo(Relation index);
 
extern bool CompareIndexInfo(const IndexInfo *info1, const IndexInfo *info2,
                             const Oid *collations1, const Oid *collations2,
                             const Oid *opfamilies1, const Oid *opfamilies2,
                             const AttrMap *attmap);
 
extern void BuildSpeculativeIndexInfo(Relation index, IndexInfo *ii);
 
extern void FormIndexDatum(IndexInfo *indexInfo,
                           TupleTableSlot *slot,
                           EState *estate,
                           Datum *values,
                           bool *isnull);
 
extern void index_build(Relation heapRelation,
                        Relation indexRelation,
                        IndexInfo *indexInfo,
                        bool isreindex,
                        bool parallel);
 
extern void validate_index(Oid heapId, Oid indexId, Snapshot snapshot);
 
extern void index_set_state_flags(Oid indexId, IndexStateFlagsAction action);
 
extern Oid  IndexGetRelation(Oid indexId, bool missing_ok);
 
extern void reindex_index(const ReindexStmt *stmt, Oid indexId,
                          bool skip_constraint_checks, char persistence,
                          const ReindexParams *params);
 
/* Flag bits for reindex_relation(): */
#define REINDEX_REL_PROCESS_TOAST           0x01
#define REINDEX_REL_SUPPRESS_INDEX_USE      0x02
#define REINDEX_REL_CHECK_CONSTRAINTS       0x04
#define REINDEX_REL_FORCE_INDEXES_UNLOGGED  0x08
#define REINDEX_REL_FORCE_INDEXES_PERMANENT 0x10
 
extern bool reindex_relation(const ReindexStmt *stmt, Oid relid, int flags,
                             const ReindexParams *params);
 
extern bool ReindexIsProcessingHeap(Oid heapOid);
extern bool ReindexIsProcessingIndex(Oid indexOid);
 
extern void ResetReindexState(int nestLevel);
extern Size EstimateReindexStateSpace(void);
extern void SerializeReindexState(Size maxsize, char *start_address);
extern void RestoreReindexState(const void *reindexstate);
 
extern void IndexSetParentIndex(Relation partitionIdx, Oid parentOid);
 
 
/*
 * itemptr_encode - Encode ItemPointer as int64/int8
 *
 * This representation must produce values encoded as int64 that sort in the
 * same order as their corresponding original TID values would (using the
 * default int8 opclass to produce a result equivalent to the default TID
 * opclass).
 *
 * As noted in validate_index(), this can be significantly faster.
 */
static inline int64
itemptr_encode(ItemPointer itemptr)
{
    BlockNumber block = ItemPointerGetBlockNumber(itemptr);
    OffsetNumber offset = ItemPointerGetOffsetNumber(itemptr);
    int64       encoded;
 
    /*
     * Use the 16 least significant bits for the offset.  32 adjacent bits are
     * used for the block number.  Since remaining bits are unused, there
     * cannot be negative encoded values (We assume a two's complement
     * representation).
     */
    encoded = ((uint64) block << 16) | (uint16) offset;
 
    return encoded;
}
 
/*
 * itemptr_decode - Decode int64/int8 representation back to ItemPointer
 */
static inline void
itemptr_decode(ItemPointer itemptr, int64 encoded)
{
    BlockNumber block = (BlockNumber) (encoded >> 16);
    OffsetNumber offset = (OffsetNumber) (encoded & 0xFFFF);
 
    ItemPointerSet(itemptr, block, offset);
}
 
#endif                          /* INDEX_H */