/*
* Returns true iff there are entries stored for the
* given segment file num.
*/
bool
AppendOnlyVisimapStore_IsSegmentFileFullyVisible(
AppendOnlyVisimapStore *visiMapStore,
int segmentFileNum)
{
ScanKeyData scanKey;
IndexScanDesc indexScan;
bool found_visimap_entry;
Assert(visiMapStore);
Assert(RelationIsValid(visiMapStore->visimapRelation));
Assert(RelationIsValid(visiMapStore->visimapIndex));
ScanKeyInit(&scanKey,
Anum_pg_aovisimap_segno, /* segno */
BTEqualStrategyNumber,
F_INT4EQ,
Int32GetDatum(segmentFileNum));
indexScan = AppendOnlyVisimapStore_BeginScan(
visiMapStore,
1,
&scanKey);
found_visimap_entry = AppendOnlyVisimapStore_GetNext(
visiMapStore,
indexScan,
ForwardScanDirection,
NULL, NULL);
AppendOnlyVisimapStore_EndScan(visiMapStore, indexScan);
return !found_visimap_entry;
}
/*
* Returns the number of hidden tuples in a given releation
*/
int64
AppendOnlyVisimapStore_GetRelationHiddenTupleCount(
AppendOnlyVisimapStore *visiMapStore,
AppendOnlyVisimapEntry *visiMapEntry)
{
IndexScanDesc indexScan;
int64 hiddenTupcount = 0;
Assert(visiMapStore);
Assert(visiMapEntry);
Assert(RelationIsValid(visiMapStore->visimapRelation));
Assert(RelationIsValid(visiMapStore->visimapIndex));
indexScan = AppendOnlyVisimapStore_BeginScan(
visiMapStore,
0,
NULL);
while (AppendOnlyVisimapStore_GetNext(visiMapStore,
indexScan, ForwardScanDirection,
visiMapEntry, NULL))
{
hiddenTupcount += AppendOnlyVisimapEntry_GetHiddenTupleCount(visiMapEntry);
}
AppendOnlyVisimapStore_EndScan(visiMapStore, indexScan);
return hiddenTupcount;
}
/*
* Returns the number of hidden tuples in a given segment file
*/
int64
AppendOnlyVisimapStore_GetSegmentFileHiddenTupleCount(
AppendOnlyVisimapStore *visiMapStore,
AppendOnlyVisimapEntry *visiMapEntry,
int segmentFileNum)
{
ScanKeyData scanKey;
IndexScanDesc indexScan;
int64 hiddenTupcount = 0;
Assert(visiMapStore);
Assert(visiMapEntry);
Assert(RelationIsValid(visiMapStore->visimapRelation));
Assert(RelationIsValid(visiMapStore->visimapIndex));
ScanKeyInit(&scanKey,
Anum_pg_aovisimap_segno, /* segno */
BTEqualStrategyNumber,
F_INT4EQ,
Int32GetDatum(segmentFileNum));
indexScan = AppendOnlyVisimapStore_BeginScan(
visiMapStore,
1,
&scanKey);
while (AppendOnlyVisimapStore_GetNext(visiMapStore,
indexScan, ForwardScanDirection,
visiMapEntry, NULL))
{
hiddenTupcount += AppendOnlyVisimapEntry_GetHiddenTupleCount(visiMapEntry);
}
AppendOnlyVisimapStore_EndScan(visiMapStore, indexScan);
return hiddenTupcount;
}
/**
* Finds the visibility map entry tuple for a given
* segmentFileNum and firstRowNum.
*
* Note: The firstRowNum needs to be a valid firstRowNum. It is
* especially not the tuple id of the append-only tuple checked, updated,
* or deleted.
*
* Returns true if there is such a tuple and
* the tuple is used as current tuple.
* Otherwise false is returned.
*
* Assumes that the store data structure has been initialized, but not finished.
*/
bool
AppendOnlyVisimapStore_Find(
AppendOnlyVisimapStore* visiMapStore,
int32 segmentFileNum,
int64 firstRowNum,
AppendOnlyVisimapEntry* visiMapEntry)
{
ScanKey scanKeys;
IndexScanDesc indexScan;
Assert(visiMapStore);
Assert(visiMapEntry);
Assert(RelationIsValid(visiMapStore->visimapRelation));
Assert(RelationIsValid(visiMapStore->visimapIndex));
elogif (Debug_appendonly_print_visimap, LOG,
"Append-only visi map store: Load entry: "
"(segFileNum, firstRowNum) = (%u, " INT64_FORMAT ")",
segmentFileNum, firstRowNum);
scanKeys = visiMapStore->scanKeys;
scanKeys[0].sk_argument = Int32GetDatum(segmentFileNum);
scanKeys[1].sk_argument = Int64GetDatum(firstRowNum);
indexScan = AppendOnlyVisimapStore_BeginScan(
visiMapStore,
APPENDONLY_VISIMAP_INDEX_SCAN_KEY_NUM,
scanKeys);
if (!AppendOnlyVisimapStore_GetNext(
visiMapStore,
indexScan,
BackwardScanDirection,
visiMapEntry,
&visiMapEntry->tupleTid))
{
elogif(Debug_appendonly_print_visimap, LOG,
"Append-only visi map store: Visimap entry does not exist: "
"(segFileNum, firstRowNum) = (%u, " INT64_FORMAT ")",
segmentFileNum, firstRowNum);
// failed to lookup row
AppendOnlyVisimapStore_EndScan(visiMapStore, indexScan);
return false;
}
AppendOnlyVisimapStore_EndScan(visiMapStore, indexScan);
return true;
}
/*
* Deletes all visibility map information from a given
* segment file.
*/
void
AppendOnlyVisimapStore_DeleteSegmentFile(
AppendOnlyVisimapStore *visiMapStore,
int segmentFileNum)
{
ScanKeyData scanKey;
IndexScanDesc indexScan;
ItemPointerData tid;
Assert(visiMapStore);
Assert(RelationIsValid(visiMapStore->visimapRelation));
Assert(RelationIsValid(visiMapStore->visimapIndex));
elogif(Debug_appendonly_print_visimap, LOG,
"Append-only visi map store: Delete segment file: "
"(segFileNum) = (%u)", segmentFileNum);
ScanKeyInit(&scanKey,
Anum_pg_aovisimap_segno, /* segno */
BTEqualStrategyNumber,
F_INT4EQ,
Int32GetDatum(segmentFileNum));
indexScan = AppendOnlyVisimapStore_BeginScan(
visiMapStore,
1,
&scanKey);
while (AppendOnlyVisimapStore_GetNext(visiMapStore,
indexScan,
ForwardScanDirection,
NULL,
&tid))
{
simple_heap_delete(visiMapStore->visimapRelation,
&tid);
}
AppendOnlyVisimapStore_EndScan(visiMapStore, indexScan);
}
/*
* Returns true iff there are entries of the relation are visible
*/
bool
AppendOnlyVisimapStore_IsRelationFullyVisible(
AppendOnlyVisimapStore *visiMapStore)
{
IndexScanDesc indexScan;
bool found_visimap_entry;
Assert(visiMapStore);
Assert(RelationIsValid(visiMapStore->visimapRelation));
Assert(RelationIsValid(visiMapStore->visimapIndex));
indexScan = AppendOnlyVisimapStore_BeginScan(
visiMapStore,
0,
NULL);
found_visimap_entry = AppendOnlyVisimapStore_GetNext(
visiMapStore,
indexScan,
ForwardScanDirection,
NULL, NULL);
AppendOnlyVisimapStore_EndScan(visiMapStore, indexScan);
return !found_visimap_entry;
}
static Datum
gp_aovisimap_entry_internal(PG_FUNCTION_ARGS, Oid aoRelOid)
{
Datum values[4];
bool nulls[4];
HeapTuple tuple;
Datum result;
typedef struct Context
{
AppendOnlyVisimap visiMap;
Relation parentRelation;
IndexScanDesc indexScan;
text *bitmapBuffer;
} Context;
FuncCallContext *funcctx;
Context *context;
if (SRF_IS_FIRSTCALL())
{
TupleDesc tupdesc;
MemoryContext oldcontext;
/* create a function context for cross-call persistence */
funcctx = SRF_FIRSTCALL_INIT();
/*
* switch to memory context appropriate for multiple function
* calls
*/
oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
/* build tupdesc for result tuples */
tupdesc = CreateTemplateTupleDesc(4, false);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, "segno",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 2, "first_row_num",
INT8OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 3, "hidden_tupcount",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 4, "bitmap",
TEXTOID, -1, 0);
funcctx->tuple_desc = BlessTupleDesc(tupdesc);
/*
* Collect all the locking information that we will format and send
* out as a result set.
*/
context = (Context *) palloc0(sizeof(Context));
context->parentRelation = heap_open(aoRelOid, AccessShareLock);
if (!(RelationIsAoRows(context->parentRelation) || RelationIsAoCols(context->parentRelation)))
{
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("Function not supported on relation")));
}
AppendOnlyVisimap_Init(&context->visiMap,
context->parentRelation->rd_appendonly->visimaprelid,
context->parentRelation->rd_appendonly->visimapidxid,
AccessShareLock,
SnapshotNow);
context->indexScan = AppendOnlyVisimapStore_BeginScan(&
context->visiMap.visimapStore, 0, NULL);
context->bitmapBuffer = palloc0(VARHDRSZ + APPENDONLY_VISIMAP_MAX_RANGE + 1);
funcctx->user_fctx = (void *) context;
MemoryContextSwitchTo(oldcontext);
}
funcctx = SRF_PERCALL_SETUP();
context = (Context *) funcctx->user_fctx;
if (AppendOnlyVisimapStore_GetNext(&context->visiMap.visimapStore,
context->indexScan,
ForwardScanDirection,
&context->visiMap.visimapEntry,
NULL))
{
AppendOnlyVisimapEntry *visimapEntry = &context->visiMap.visimapEntry;
MemSet(values, 0, sizeof(values));
MemSet(nulls, false, sizeof(nulls));
values[0] = Int32GetDatum(visimapEntry->segmentFileNum);
values[1] = Int64GetDatum(visimapEntry->firstRowNum);
values[2] = Int32GetDatum(
(int32)AppendOnlyVisimapEntry_GetHiddenTupleCount(visimapEntry));
gp_aovisimap_encode_bitmap(VARDATA(context->bitmapBuffer),
visimapEntry->bitmap);
SET_VARSIZE(context->bitmapBuffer, APPENDONLY_VISIMAP_MAX_RANGE);
values[3] = PointerGetDatum(context->bitmapBuffer);
tuple = heap_form_tuple(funcctx->tuple_desc, values, nulls);
result = HeapTupleGetDatum(tuple);
SRF_RETURN_NEXT(funcctx, result);
}
AppendOnlyVisimapStore_EndScan(&context->visiMap.visimapStore,
context->indexScan);
AppendOnlyVisimap_Finish(&context->visiMap, AccessShareLock);
heap_close(context->parentRelation, AccessShareLock);
pfree(context->bitmapBuffer);
pfree(context);
funcctx->user_fctx = NULL;
SRF_RETURN_DONE(funcctx);
}
