/*
* tuplestore_begin_heap
*
* Create a new tuplestore; other types of tuple stores (other than
* "heap" tuple stores, for heap tuples) are possible, but not presently
* implemented.
*
* randomAccess: if true, both forward and backward accesses to the
* tuple store are allowed.
*
* interXact: if true, the files used for on-disk storage persist beyond the
* end of the current transaction. NOTE: It's the caller's responsibility to
* create such a tuplestore in a memory context that will also survive
* transaction boundaries, and to ensure the tuplestore is closed when it's
* no longer wanted.
*
* maxKBytes: how much data to store in memory (any data beyond this
* amount is paged to disk). When in doubt, use work_mem.
*/
Tuplestorestate *
tuplestore_begin_heap(bool randomAccess, bool interXact, int maxKBytes)
{
Tuplestorestate *state;
state = tuplestore_begin_common(randomAccess, interXact, maxKBytes);
state->copytup = copytup_heap;
state->writetup = writetup_heap;
state->readtup = readtup_heap;
return state;
}
Tuplestorestate *
tuplestore_begin_heap_file_readerwriter(const char* fileName, bool isWriter)
{
Tuplestorestate *state;
state = tuplestore_begin_common(true, true, 1);
state->myfile = BufFileCreateTemp_ReaderWriter(fileName, isWriter);
state->status = isWriter ? TSS_WRITEFILE : TSS_READFILE;
state->copytup = copytup_heap;
state->writetup = writetup_heap;
state->readtup = readtup_heap;
return state;
}
/*
* tuplestore_begin_heap
*
* Create a new tuplestore; other types of tuple stores (other than
* "heap" tuple stores, for heap tuples) are possible, but not presently
* implemented.
*
* randomAccess: if true, both forward and backward accesses to the
* tuple store are allowed.
*
* interXact: if true, the files used for on-disk storage persist beyond the
* end of the current transaction. NOTE: It's the caller's responsibility to
* create such a tuplestore in a memory context and resource owner that will
* also survive transaction boundaries, and to ensure the tuplestore is closed
* when it's no longer wanted.
*
* maxKBytes: how much data to store in memory (any data beyond this
* amount is paged to disk). When in doubt, use work_mem.
*/
Tuplestorestate *
tuplestore_begin_heap(bool randomAccess, bool interXact, int maxKBytes)
{
Tuplestorestate *state;
int eflags;
/*
* This interpretation of the meaning of randomAccess is compatible with
* the pre-8.3 behavior of tuplestores.
*/
eflags = randomAccess ?
(EXEC_FLAG_BACKWARD | EXEC_FLAG_REWIND) :
(EXEC_FLAG_REWIND);
state = tuplestore_begin_common(eflags, interXact, maxKBytes);
state->copytup = copytup_heap;
state->writetup = writetup_heap;
state->readtup = readtup_heap;
return state;
}