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/*------------------------------------------------------------------------- * * tuplestore.h * Generalized routines for temporary tuple storage. * * This module handles temporary storage of tuples for purposes such * as Materialize nodes, hashjoin batch files, etc. It is essentially * a dumbed-down version of tuplesort.c; it does no sorting of tuples * but can only store and regurgitate a sequence of tuples. However, * because no sort is required, it is allowed to start reading the sequence * before it has all been written. This is particularly useful for cursors, * because it allows random access within the already-scanned portion of * a query without having to process the underlying scan to completion. * Also, it is possible to support multiple independent read pointers. * * A temporary file is used to handle the data if it exceeds the * space limit specified by the caller. * * Beginning in Postgres 8.2, what is stored is just MinimalTuples; * callers cannot expect valid system columns in regurgitated tuples. * Also, we have changed the API to return tuples in TupleTableSlots, * so that there is a check to prevent attempted access to system columns. * * Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * * src/include/utils/tuplestore.h * *------------------------------------------------------------------------- */ #ifndef TUPLESTORE_H #define TUPLESTORE_H #include "executor/tuptable.h" /* Tuplestorestate is an opaque type whose details are not known outside * tuplestore.c. */ typedef struct Tuplestorestate Tuplestorestate; /* * Currently we only need to store MinimalTuples, but it would be easy * to support the same behavior for IndexTuples and/or bare Datums. */ extern Tuplestorestate *tuplestore_begin_heap(bool randomAccess, bool interXact, int maxKBytes); extern void tuplestore_set_eflags(Tuplestorestate *state, int eflags); extern void tuplestore_puttupleslot(Tuplestorestate *state, TupleTableSlot *slot); extern void tuplestore_puttuple(Tuplestorestate *state, HeapTuple tuple); extern void tuplestore_putvalues(Tuplestorestate *state, TupleDesc tdesc, Datum *values, bool *isnull); /* tuplestore_donestoring() used to be required, but is no longer used */ #define tuplestore_donestoring(state) ((void) 0) extern int tuplestore_alloc_read_pointer(Tuplestorestate *state, int eflags); extern void tuplestore_select_read_pointer(Tuplestorestate *state, int ptr); extern void tuplestore_copy_read_pointer(Tuplestorestate *state, int srcptr, int destptr); extern void tuplestore_trim(Tuplestorestate *state); extern bool tuplestore_in_memory(Tuplestorestate *state); extern bool tuplestore_gettupleslot(Tuplestorestate *state, bool forward, bool copy, TupleTableSlot *slot); extern bool tuplestore_advance(Tuplestorestate *state, bool forward); extern bool tuplestore_skiptuples(Tuplestorestate *state, int64 ntuples, bool forward); extern bool tuplestore_ateof(Tuplestorestate *state); extern void tuplestore_rescan(Tuplestorestate *state); extern void tuplestore_clear(Tuplestorestate *state); extern void tuplestore_end(Tuplestorestate *state); #endif /* TUPLESTORE_H */