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/*------------------------------------------------------------------------- * * tidbitmap.h * PostgreSQL tuple-id (TID) bitmap package * * This module provides bitmap data structures that are spiritually * similar to Bitmapsets, but are specially adapted to store sets of * tuple identifiers (TIDs), or ItemPointers. In particular, the division * of an ItemPointer into BlockNumber and OffsetNumber is catered for. * Also, since we wish to be able to store very large tuple sets in * memory with this data structure, we support "lossy" storage, in which * we no longer remember individual tuple offsets on a page but only the * fact that a particular page needs to be visited. * * * Copyright (c) 2003-2016, PostgreSQL Global Development Group * * src/include/nodes/tidbitmap.h * *------------------------------------------------------------------------- */ #ifndef TIDBITMAP_H #define TIDBITMAP_H #include "storage/itemptr.h" /* * Actual bitmap representation is private to tidbitmap.c. Callers can * do IsA(x, TIDBitmap) on it, but nothing else. */ typedef struct TIDBitmap TIDBitmap; /* Likewise, TBMIterator is private */ typedef struct TBMIterator TBMIterator; /* Result structure for tbm_iterate */ typedef struct { BlockNumber blockno; /* page number containing tuples */ int ntuples; /* -1 indicates lossy result */ bool recheck; /* should the tuples be rechecked? */ /* Note: recheck is always true if ntuples < 0 */ OffsetNumber offsets[FLEXIBLE_ARRAY_MEMBER]; } TBMIterateResult; /* function prototypes in nodes/tidbitmap.c */ extern TIDBitmap *tbm_create(long maxbytes); extern void tbm_free(TIDBitmap *tbm); extern void tbm_add_tuples(TIDBitmap *tbm, const ItemPointer tids, int ntids, bool recheck); extern void tbm_add_page(TIDBitmap *tbm, BlockNumber pageno); extern void tbm_union(TIDBitmap *a, const TIDBitmap *b); extern void tbm_intersect(TIDBitmap *a, const TIDBitmap *b); extern bool tbm_is_empty(const TIDBitmap *tbm); extern TBMIterator *tbm_begin_iterate(TIDBitmap *tbm); extern TBMIterateResult *tbm_iterate(TBMIterator *iterator); extern void tbm_end_iterate(TBMIterator *iterator); #endif /* TIDBITMAP_H */