greenplumn aocssegfiles 源码
greenplumn aocssegfiles 代码
文件路径：/src/backend/access/aocs/aocssegfiles.c
/*-------------------------------------------------------------------------
*
* aocssegfiles.c
* AOCS Segment files.
*
* Portions Copyright (c) 2009, Greenplum Inc.
* Portions Copyright (c) 2012-Present VMware, Inc. or its affiliates.
*
*
* IDENTIFICATION
* src/backend/access/aocs/aocssegfiles.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include <math.h>
#include "cdb/cdbappendonlystorage.h"
#include "access/aomd.h"
#include "access/heapam.h"
#include "access/genam.h"
#include "access/hio.h"
#include "access/multixact.h"
#include "access/transam.h"
#include "access/tuptoaster.h"
#include "access/valid.h"
#include "access/xact.h"
#include "catalog/catalog.h"
#include "catalog/pg_appendonly.h"
#include "catalog/namespace.h"
#include "catalog/indexing.h"
#include "catalog/gp_fastsequence.h"
#include "cdb/cdbvars.h"
#include "executor/spi.h"
#include "nodes/makefuncs.h"
#include "utils/acl.h"
#include "utils/lsyscache.h"
#include "utils/snapmgr.h"
#include "utils/syscache.h"
#include "utils/numeric.h"
#include "cdb/cdbappendonlyblockdirectory.h"
#include "cdb/cdbappendonlystoragelayer.h"
#include "cdb/cdbappendonlystorageread.h"
#include "cdb/cdbappendonlystoragewrite.h"
#include "utils/datumstream.h"
#include "utils/int8.h"
#include "utils/fmgroids.h"
#include "access/aocssegfiles.h"
#include "access/aosegfiles.h"
#include "access/appendonlywriter.h"
#include "cdb/cdbaocsam.h"
#include "executor/executor.h"
#include "storage/lmgr.h"
#include "storage/procarray.h"
#include "funcapi.h"
#include "access/heapam.h"
#include "catalog/pg_type.h"
#include "utils/builtins.h"
static AOCSFileSegInfo **GetAllAOCSFileSegInfo_pg_aocsseg_rel(
int numOfColumsn,
char *relationName,
Relation pg_aocsseg_rel,
Snapshot appendOnlyMetaDataSnapshot,
int32 *totalseg);
void
InsertInitialAOCSFileSegInfo(Relation prel, int32 segno, int32 nvp, Oid segrelid)
{
bool *nulls = palloc0(sizeof(bool) * Natts_pg_aocsseg);
Datum *values = palloc0(sizeof(Datum) * Natts_pg_aocsseg);
AOCSVPInfo *vpinfo = create_aocs_vpinfo(nvp);
HeapTuple segtup;
Relation segrel;
Buffer buf = InvalidBuffer;
TM_Result result;
TM_FailureData hufd;
int16 formatVersion;
ValidateAppendonlySegmentDataBeforeStorage(segno);
/* New segments are always created in the latest format */
formatVersion = AORelationVersion_GetLatest();
segrel = heap_open(segrelid, RowExclusiveLock);
values[Anum_pg_aocs_segno - 1] = Int32GetDatum(segno);
values[Anum_pg_aocs_vpinfo - 1] = PointerGetDatum(vpinfo);
values[Anum_pg_aocs_tupcount - 1] = Int64GetDatum(0);
values[Anum_pg_aocs_varblockcount - 1] = Int64GetDatum(0);
values[Anum_pg_aocs_formatversion - 1] = Int16GetDatum(formatVersion);
values[Anum_pg_aocs_state - 1] = Int16GetDatum(AOSEG_STATE_DEFAULT);
segtup = heap_form_tuple(RelationGetDescr(segrel), values, nulls);
CatalogTupleInsertFrozen(segrel, segtup);
/*
* Lock the tuple so that a concurrent insert transaction will not
* consider this segfile for insertion. This should succeed since
* we just inserted the row, and the caller is holding a lock that
* prevents concurrent lockers.
*/
result = heap_lock_tuple(segrel, segtup,
GetCurrentCommandId(true),
LockTupleExclusive,
LockWaitSkip,
false, /* follow_updates */
&buf,
&hufd);
if (result != TM_Ok)
elog(ERROR, "could not lock newly-inserted gp_fastsequence tuple");
if (BufferIsValid(buf))
ReleaseBuffer(buf);
heap_freetuple(segtup);
heap_close(segrel, RowExclusiveLock);
pfree(vpinfo);
pfree(nulls);
pfree(values);
}
/*
* GetAOCSFileSegInfo.
*
* Get the catalog entry for an appendonly (column-oriented) relation from the
* pg_aocsseg_* relation that belongs to the currently used
* AppendOnly table.
*
* If a caller intends to append to this (logical) file segment entry they
* must have already locked the pg_aoseg tuple earlier, in order to guarantee
* stability of the pg_aoseg information on this segment file and exclusive
* right to append data to the segment file. In that case, 'locked' should be
* passed as true.
*/
AOCSFileSegInfo *
GetAOCSFileSegInfo(Relation prel,
Snapshot appendOnlyMetaDataSnapshot,
int32 segno,
bool locked)
{
int32 nvp = RelationGetNumberOfAttributes(prel);
Relation segrel;
TupleDesc tupdesc;
SysScanDesc scan;
HeapTuple segtup = NULL;
HeapTuple fssegtup = NULL;
int tuple_segno = InvalidFileSegNumber;
AOCSFileSegInfo *seginfo;
Datum *d;
bool *null;
bool isNull;
Oid segrelid;
GetAppendOnlyEntryAuxOids(prel->rd_id,
appendOnlyMetaDataSnapshot,
&segrelid, NULL, NULL,
NULL, NULL);
segrel = heap_open(segrelid, AccessShareLock);
tupdesc = RelationGetDescr(segrel);
/* Scan aoseg relation for tuple. */
scan = systable_beginscan(segrel, InvalidOid, false, appendOnlyMetaDataSnapshot, 0, NULL);
while ((segtup = systable_getnext(scan)) != NULL)
{
tuple_segno = DatumGetInt32(fastgetattr(segtup, Anum_pg_aocs_segno, tupdesc, &isNull));
if (isNull)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("got invalid segno value NULL for tid %s",
ItemPointerToString(&segtup->t_self))));
if (segno == tuple_segno)
{
/* Check for duplicate aoseg entries with the same segno */
if (fssegtup != NULL)
ereport(ERROR,
(errcode(ERRCODE_INTERNAL_ERROR),
errmsg("found two entries in %s with segno %d: ctid %s and ctid %s",
RelationGetRelationName(segrel),
segno,
ItemPointerToString(&fssegtup->t_self),
ItemPointerToString2(&segtup->t_self))));
else
fssegtup = heap_copytuple(segtup);
}
}
if (!HeapTupleIsValid(fssegtup))
{
/* This segment file does not have an entry. */
systable_endscan(scan);
heap_close(segrel, AccessShareLock);
if (locked)
ereport(ERROR,
(errcode(ERRCODE_INTERNAL_ERROR),
errmsg("could not find segno %d for relation %s",
segno, RelationGetRelationName(prel))));
return NULL;
}
if (locked && !pg_aoseg_tuple_is_locked_by_me(fssegtup))
ereport(ERROR,
(errcode(ERRCODE_INTERNAL_ERROR),
errmsg("segno %d for relation %s is not locked for us",
segno, RelationGetRelationName(prel))));
seginfo = (AOCSFileSegInfo *) palloc0(aocsfileseginfo_size(nvp));
d = (Datum *) palloc(sizeof(Datum) * Natts_pg_aocsseg);
null = (bool *) palloc(sizeof(bool) * Natts_pg_aocsseg);
heap_deform_tuple(fssegtup, tupdesc, d, null);
Assert(!null[Anum_pg_aocs_segno - 1]);
Assert(DatumGetInt32(d[Anum_pg_aocs_segno - 1] == segno));
seginfo ->segno = segno;
Assert(!null[Anum_pg_aocs_tupcount - 1]);
seginfo ->total_tupcount = DatumGetInt64(d[Anum_pg_aocs_tupcount - 1]);
Assert(!null[Anum_pg_aocs_varblockcount - 1]);
seginfo ->varblockcount = DatumGetInt64(d[Anum_pg_aocs_varblockcount - 1]);
Assert(!null[Anum_pg_aocs_modcount - 1]);
seginfo ->modcount = DatumGetInt64(d[Anum_pg_aocs_modcount - 1]);
Assert(!null[Anum_pg_aocs_formatversion - 1]);
seginfo ->formatversion = DatumGetInt16(d[Anum_pg_aocs_formatversion - 1]);
Assert(!null[Anum_pg_aocs_state - 1]);
seginfo ->state = DatumGetInt16(d[Anum_pg_aocs_state - 1]);
Assert(!null[Anum_pg_aocs_vpinfo - 1]);
{
struct varlena *v = (struct varlena *) DatumGetPointer(d[Anum_pg_aocs_vpinfo - 1]);
struct varlena *dv = pg_detoast_datum(v);
Assert(VARSIZE(dv) <= aocs_vpinfo_size(nvp));
memcpy(&seginfo->vpinfo, dv, aocs_vpinfo_size(nvp));
if (dv != v)
pfree(dv);
}
pfree(d);
pfree(null);
heap_freetuple(fssegtup);
systable_endscan(scan);
heap_close(segrel, AccessShareLock);
return seginfo;
}
AOCSFileSegInfo **
GetAllAOCSFileSegInfo(Relation prel,
Snapshot appendOnlyMetaDataSnapshot,
int32 *totalseg,
Oid *segrelidptr)
{
Relation pg_aocsseg_rel;
AOCSFileSegInfo **results;
Oid segrelid;
Assert(RelationIsAoCols(prel));
GetAppendOnlyEntryAuxOids(prel->rd_id,
appendOnlyMetaDataSnapshot,
&segrelid, NULL, NULL,
NULL, NULL);
if (segrelid == InvalidOid)
elog(ERROR, "could not find pg_aoseg aux table for AOCO table \"%s\"",
RelationGetRelationName(prel));
if (segrelidptr != NULL)
*segrelidptr = segrelid;
pg_aocsseg_rel = relation_open(segrelid, AccessShareLock);
results = GetAllAOCSFileSegInfo_pg_aocsseg_rel(
RelationGetNumberOfAttributes(prel),
RelationGetRelationName(prel),
pg_aocsseg_rel,
appendOnlyMetaDataSnapshot,
totalseg);
heap_close(pg_aocsseg_rel, AccessShareLock);
return results;
}
/*
* The comparison routine that sorts an array of AOCSFileSegInfos
* in the ascending order of the segment number.
*/
static int
aocsFileSegInfoCmp(const void *left, const void *right)
{
AOCSFileSegInfo *leftSegInfo = *((AOCSFileSegInfo **) left);
AOCSFileSegInfo *rightSegInfo = *((AOCSFileSegInfo **) right);
if (leftSegInfo->segno < rightSegInfo->segno)
return -1;
if (leftSegInfo->segno > rightSegInfo->segno)
return 1;
return 0;
}
static AOCSFileSegInfo **
GetAllAOCSFileSegInfo_pg_aocsseg_rel(int numOfColumns,
char *relationName,
Relation pg_aocsseg_rel,
Snapshot snapshot,
int32 *totalseg)
{
int32 nvp = numOfColumns;
SysScanDesc scan;
HeapTuple tup;
AOCSFileSegInfo **allseg;
AOCSFileSegInfo *aocs_seginfo;
int cur_seg;
Datum *d;
bool *null;
int seginfo_slot_no = AO_FILESEGINFO_ARRAY_SIZE;
/*
* MPP-16407: Initialize the segment file information array, we first
* allocate 8 slot for the array, then array will be dynamically expanded
* later if necessary.
*/
allseg = (AOCSFileSegInfo **) palloc0(sizeof(AOCSFileSegInfo *) * seginfo_slot_no);
d = (Datum *) palloc(sizeof(Datum) * Natts_pg_aocsseg);
null = (bool *) palloc(sizeof(bool) * Natts_pg_aocsseg);
cur_seg = 0;
scan = systable_beginscan(pg_aocsseg_rel, InvalidOid, false, snapshot, 0, NULL);
while ((tup = systable_getnext(scan)) != NULL)
{
/* dynamically expand space for AOCSFileSegInfo* array */
if (cur_seg >= seginfo_slot_no)
{
seginfo_slot_no *= 2;
allseg = (AOCSFileSegInfo **) repalloc(allseg, sizeof(AOCSFileSegInfo *) * seginfo_slot_no);
}
aocs_seginfo = (AOCSFileSegInfo *) palloc0(aocsfileseginfo_size(nvp));
allseg[cur_seg] = aocs_seginfo;
heap_deform_tuple(tup, RelationGetDescr(pg_aocsseg_rel), d, null);
Assert(!null[Anum_pg_aocs_segno - 1]);
aocs_seginfo->segno = DatumGetInt32(d[Anum_pg_aocs_segno - 1]);
Assert(!null[Anum_pg_aocs_tupcount - 1]);
aocs_seginfo->total_tupcount = DatumGetInt64(d[Anum_pg_aocs_tupcount - 1]);
Assert(!null[Anum_pg_aocs_varblockcount - 1]);
aocs_seginfo->varblockcount = DatumGetInt64(d[Anum_pg_aocs_varblockcount - 1]);
/*
* Modcount cannot be NULL in normal operation. However, when called
* from gp_aoseg_history after an upgrade, the old now invisible
* entries may have not set the state and the modcount.
*/
Assert(!null[Anum_pg_aocs_modcount - 1] || snapshot == SnapshotAny);
if (!null[Anum_pg_aocs_modcount - 1])
aocs_seginfo->modcount = DatumGetInt64(d[Anum_pg_aocs_modcount - 1]);
Assert(!null[Anum_pg_aocs_formatversion - 1]);
aocs_seginfo->formatversion = DatumGetInt16(d[Anum_pg_aocs_formatversion - 1]);
Assert(!null[Anum_pg_aocs_state - 1] || snapshot == SnapshotAny);
if (!null[Anum_pg_aocs_state - 1])
aocs_seginfo->state = DatumGetInt16(d[Anum_pg_aocs_state - 1]);
Assert(!null[Anum_pg_aocs_vpinfo - 1]);
{
struct varlena *v = (struct varlena *) DatumGetPointer(d[Anum_pg_aocs_vpinfo - 1]);
struct varlena *dv = pg_detoast_datum(v);
/*
* VARSIZE(dv) may be less than aocs_vpinfo_size, in case of add
* column, we try to do a ctas from old table to new table.
*/
Assert(VARSIZE(dv) <= aocs_vpinfo_size(nvp));
memcpy(&aocs_seginfo->vpinfo, dv, VARSIZE(dv));
if (dv != v)
pfree(dv);
}
++cur_seg;
}
pfree(d);
pfree(null);
systable_endscan(scan);
*totalseg = cur_seg;
if (*totalseg == 0)
{
pfree(allseg);
return NULL;
}
/*
* Sort allseg by the order of segment file number.
*
* Currently this is only needed when building a bitmap index to guarantee
* the tids are in the ascending order. But since this array is pretty
* small, we just sort the array for all cases.
*/
qsort((char *) allseg, *totalseg, sizeof(AOCSFileSegInfo *), aocsFileSegInfoCmp);
return allseg;
}
FileSegTotals *
GetAOCSSSegFilesTotals(Relation parentrel, Snapshot appendOnlyMetaDataSnapshot)
{
AOCSFileSegInfo **allseg;
int totalseg;
int s;
AOCSVPInfo *vpinfo;
FileSegTotals *totals;
Assert(RelationIsValid(parentrel));
Assert(RelationIsAoCols(parentrel));
totals = (FileSegTotals *) palloc0(sizeof(FileSegTotals));
memset(totals, 0, sizeof(FileSegTotals));
allseg = GetAllAOCSFileSegInfo(parentrel, appendOnlyMetaDataSnapshot, &totalseg, NULL);
for (s = 0; s < totalseg; s++)
{
int32 nEntry;
int e;
vpinfo = &((allseg[s])->vpinfo);
nEntry = vpinfo->nEntry;
for (e = 0; e < nEntry; e++)
{
totals->totalbytes += vpinfo->entry[e].eof;
totals->totalbytesuncompressed += vpinfo->entry[e].eof_uncompressed;
}
if (allseg[s]->state != AOSEG_STATE_AWAITING_DROP)
{
totals->totaltuples += allseg[s]->total_tupcount;
}
totals->totalvarblocks += allseg[s]->varblockcount;
totals->totalfilesegs++;
}
if (allseg)
{
FreeAllAOCSSegFileInfo(allseg, totalseg);
pfree(allseg);
}
return totals;
}
/*
* Change an pg_aoseg row from DEFAULT to AWAITING_DROP to DEFAULT.
*/
void
MarkAOCSFileSegInfoAwaitingDrop(Relation prel, int segno)
{
Relation segrel;
TableScanDesc scan;
HeapTuple oldtup = NULL;
HeapTuple newtup;
int tuple_segno = InvalidFileSegNumber;
Datum d[Natts_pg_aocsseg];
bool isNull;
bool null[Natts_pg_aocsseg] = {0,};
bool repl[Natts_pg_aocsseg] = {0,};
TupleDesc tupdesc;
Snapshot appendOnlyMetaDataSnapshot;
Oid segrelid;
if (Debug_appendonly_print_compaction)
elog(LOG,
"changing state of segfile %d of table '%s' to AWAITING_DROP",
segno, RelationGetRelationName(prel));
Assert(RelationIsAoCols(prel));
appendOnlyMetaDataSnapshot = RegisterSnapshot(GetCatalogSnapshot(InvalidOid));
GetAppendOnlyEntryAuxOids(prel->rd_id,
appendOnlyMetaDataSnapshot,
&segrelid, NULL, NULL,
NULL, NULL);
UnregisterSnapshot(appendOnlyMetaDataSnapshot);
segrel = heap_open(segrelid, RowExclusiveLock);
tupdesc = RelationGetDescr(segrel);
/*
* Since we have the segment-file entry under lock (with
* LockRelationAppendOnlySegmentFile) we can use SnapshotNow.
*/
scan = table_beginscan_catalog(segrel, 0, NULL);
while (segno != tuple_segno && (oldtup = heap_getnext(scan, ForwardScanDirection)) != NULL)
{
tuple_segno = DatumGetInt32(fastgetattr(oldtup, Anum_pg_aocs_segno, tupdesc, &isNull));
if (isNull)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("got invalid segno value NULL for tid %s",
ItemPointerToString(&oldtup->t_self))));
}
if (!HeapTupleIsValid(oldtup))
ereport(ERROR, (errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("AOCS table \"%s\" file segment \"%d\" does not exist",
RelationGetRelationName(prel), segno)
));
/*
* Verify that the caller locked the segment earlier. In principle, if
* the caller is holding an AccessExclusiveLock on the table, locking
* individual tuples would not be necessary, but all current callers
* diligently lock the tuples anyway, so we can perform this sanity check
* here.
*/
if (!pg_aoseg_tuple_is_locked_by_me(oldtup))
ereport(ERROR,
(errcode(ERRCODE_INTERNAL_ERROR),
errmsg("cannot update pg_aocs entry for segno %d for relation %s, it is not locked for us",
segno, RelationGetRelationName(prel))));
d[Anum_pg_aocs_state - 1] = Int16GetDatum(AOSEG_STATE_AWAITING_DROP);
repl[Anum_pg_aocs_state - 1] = true;
newtup = heap_modify_tuple(oldtup, tupdesc, d, null, repl);
simple_heap_update(segrel, &oldtup->t_self, newtup);
pfree(newtup);
table_endscan(scan);
table_close(segrel, RowExclusiveLock);
}
/*
* Reset state of an pg_aocs row from AWAITING_DROP to DEFAULT state.
*
* Also clears tupcount, varblockcount, and EOFs, and sets formatversion to
* the latest version. 'modcount' is not changed.
*
* The caller should have checked that the segfile is no longer needed by
* any running transaction. It is not necessary to hold a lock on the segfile
* row, though.
*/
void
ClearAOCSFileSegInfo(Relation prel, int segno)
{
Relation segrel;
TableScanDesc scan;
HeapTuple oldtup = NULL;
HeapTuple newtup;
int tuple_segno = InvalidFileSegNumber;
Datum d[Natts_pg_aocsseg];
bool isNull;
bool null[Natts_pg_aocsseg] = {0,};
bool repl[Natts_pg_aocsseg] = {0,};
TupleDesc tupdesc;
int nvp = RelationGetNumberOfAttributes(prel);
int i;
AOCSVPInfo *vpinfo = create_aocs_vpinfo(nvp);
Oid segrelid;
Snapshot appendOnlyMetaDataSnapshot;
Assert(RelationIsAoCols(prel));
elogif(Debug_appendonly_print_compaction, LOG,
"Clear seg file info: segno %d table '%s'",
segno,
RelationGetRelationName(prel));
appendOnlyMetaDataSnapshot = RegisterSnapshot(GetCatalogSnapshot(InvalidOid));
GetAppendOnlyEntryAuxOids(prel->rd_id,
appendOnlyMetaDataSnapshot,
&segrelid, NULL, NULL,
NULL, NULL);
UnregisterSnapshot(appendOnlyMetaDataSnapshot);
segrel = heap_open(segrelid, RowExclusiveLock);
tupdesc = RelationGetDescr(segrel);
/*
* Since we have the segment-file entry under lock (with
* LockRelationAppendOnlySegmentFile) we can use SnapshotNow.
*/
scan = table_beginscan_catalog(segrel, 0, NULL);
while (segno != tuple_segno && (oldtup = heap_getnext(scan, ForwardScanDirection)) != NULL)
{
tuple_segno = DatumGetInt32(fastgetattr(oldtup, Anum_pg_aocs_segno, tupdesc, &isNull));
if (isNull)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("got invalid segno value NULL for tid %s",
ItemPointerToString(&oldtup->t_self))));
}
if (!HeapTupleIsValid(oldtup))
ereport(ERROR, (errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("AOCS table \"%s\" file segment \"%d\" does not exist",
RelationGetRelationName(prel), segno)
));
#ifdef USE_ASSERT_CHECKING
d[Anum_pg_aocs_segno - 1] = fastgetattr(oldtup, Anum_pg_aocs_segno, tupdesc, &null[Anum_pg_aocs_segno - 1]);
Assert(!null[Anum_pg_aocs_segno - 1]);
Assert(DatumGetInt32(d[Anum_pg_aocs_segno - 1]) == segno);
#endif
d[Anum_pg_aocs_tupcount - 1] = fastgetattr(oldtup, Anum_pg_aocs_tupcount, tupdesc, &null[Anum_pg_aocs_tupcount - 1]);
Assert(!null[Anum_pg_aocs_tupcount - 1]);
d[Anum_pg_aocs_tupcount - 1] = 0;
repl[Anum_pg_aocs_tupcount - 1] = true;
d[Anum_pg_aocs_varblockcount - 1] = fastgetattr(oldtup, Anum_pg_aocs_varblockcount, tupdesc, &null[Anum_pg_aocs_varblockcount - 1]);
Assert(!null[Anum_pg_aocs_varblockcount - 1]);
d[Anum_pg_aocs_varblockcount - 1] = 0;
repl[Anum_pg_aocs_varblockcount - 1] = true;
/* When the segment is later recreated, it will be in new format */
d[Anum_pg_aocs_formatversion - 1] = Int16GetDatum(AORelationVersion_GetLatest());
repl[Anum_pg_aocs_formatversion - 1] = true;
/* We do not reset the modcount here */
for (i = 0; i < nvp; ++i)
{
vpinfo->entry[i].eof = 0;
vpinfo->entry[i].eof_uncompressed = 0;
}
d[Anum_pg_aocs_vpinfo - 1] = PointerGetDatum(vpinfo);
null[Anum_pg_aocs_vpinfo - 1] = false;
repl[Anum_pg_aocs_vpinfo - 1] = true;
d[Anum_pg_aocs_state - 1] = Int16GetDatum(AOSEG_STATE_DEFAULT);
repl[Anum_pg_aocs_state - 1] = true;
newtup = heap_modify_tuple(oldtup, tupdesc, d, null, repl);
simple_heap_update(segrel, &oldtup->t_self, newtup);
pfree(newtup);
pfree(vpinfo);
table_endscan(scan);
table_close(segrel, RowExclusiveLock);
}
void
UpdateAOCSFileSegInfo(AOCSInsertDesc idesc)
{
Relation prel = idesc->aoi_rel;
Relation segrel;
SysScanDesc scan;
HeapTuple oldtup = NULL;
HeapTuple newtup;
int tuple_segno = InvalidFileSegNumber;
bool isNull;
Datum d[Natts_pg_aocsseg];
bool null[Natts_pg_aocsseg] = {0,};
bool repl[Natts_pg_aocsseg] = {0,};
TupleDesc tupdesc;
int nvp = RelationGetNumberOfAttributes(prel);
int i;
AOCSVPInfo *vpinfo = create_aocs_vpinfo(nvp);
segrel = heap_open(idesc->segrelid, RowExclusiveLock);
tupdesc = RelationGetDescr(segrel);
/*
* Since we have the segment-file entry under lock (with
* LockRelationAppendOnlySegmentFile) we can use SnapshotNow.
*/
scan = systable_beginscan(segrel, InvalidOid, false, idesc->appendOnlyMetaDataSnapshot, 0, NULL);
while (idesc->cur_segno != tuple_segno && (oldtup = systable_getnext(scan)) != NULL)
{
tuple_segno = DatumGetInt32(fastgetattr(oldtup, Anum_pg_aocs_segno, tupdesc, &isNull));
if (isNull)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("got invalid segno value NULL for tid %s",
ItemPointerToString(&oldtup->t_self))));
}
if (!HeapTupleIsValid(oldtup))
ereport(ERROR, (errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("AOCS table \"%s\" file segment \"%d\" does not exist",
RelationGetRelationName(prel), idesc->cur_segno)
));
/*
* Verify that the caller locked the segment earlier. In principle, if
* the caller is holding an AccessExclusiveLock on the table, locking
* individual tuples would not be necessary, but all current callers
* diligently lock the tuples anyway, so we can perform this sanity check
* here.
*/
if (!pg_aoseg_tuple_is_locked_by_me(oldtup))
ereport(ERROR,
(errcode(ERRCODE_INTERNAL_ERROR),
errmsg("cannot update pg_aocs entry for segno %d for relation %s, it is not locked for us",
idesc->cur_segno, RelationGetRelationName(prel))));
#ifdef USE_ASSERT_CHECKING
d[Anum_pg_aocs_segno - 1] = fastgetattr(oldtup, Anum_pg_aocs_segno, tupdesc, &null[Anum_pg_aocs_segno - 1]);
Assert(!null[Anum_pg_aocs_segno - 1]);
Assert(DatumGetInt32(d[Anum_pg_aocs_segno - 1]) == idesc->cur_segno);
#endif
d[Anum_pg_aocs_tupcount - 1] = fastgetattr(oldtup, Anum_pg_aocs_tupcount, tupdesc, &null[Anum_pg_aocs_tupcount - 1]);
Assert(!null[Anum_pg_aocs_tupcount - 1]);
d[Anum_pg_aocs_tupcount - 1] += idesc->insertCount;
repl[Anum_pg_aocs_tupcount - 1] = true;
d[Anum_pg_aocs_varblockcount - 1] = fastgetattr(oldtup, Anum_pg_aocs_varblockcount, tupdesc, &null[Anum_pg_aocs_varblockcount - 1]);
Assert(!null[Anum_pg_aocs_varblockcount - 1]);
d[Anum_pg_aocs_varblockcount - 1] += idesc->varblockCount;
repl[Anum_pg_aocs_varblockcount - 1] = true;
if (!idesc->skipModCountIncrement)
{
d[Anum_pg_aocs_modcount - 1] = fastgetattr(oldtup, Anum_pg_aocs_modcount, tupdesc, &null[Anum_pg_aocs_modcount - 1]);
Assert(!null[Anum_pg_aocs_modcount - 1]);
d[Anum_pg_aocs_modcount - 1] += 1;
repl[Anum_pg_aocs_modcount - 1] = true;
}
/*
* Lets fetch the vpinfo structure from the existing tuple in pg_aocsseg.
* vpinfo provides us with the end-of-file (EOF) values for each column
* file.
*/
Datum d_tmp = fastgetattr(oldtup, Anum_pg_aocs_vpinfo, tupdesc,
&null[Anum_pg_aocs_vpinfo - 1]);
Assert(!null[Anum_pg_aocs_vpinfo - 1]);
struct varlena *v = (struct varlena *) DatumGetPointer(d_tmp);
struct varlena *dv = pg_detoast_datum(v);
Assert(VARSIZE(dv) == aocs_vpinfo_size(nvp));
AOCSVPInfo *oldvpinfo = (AOCSVPInfo *) dv;
/*
* Number of columns fetched from vpinfo should match number of attributes
* for relation.
*/
Assert(nvp == oldvpinfo->nEntry);
/* Check and update EOF value for each column file. */
for (i = 0; i < nvp; ++i)
{
/*
* For CO by design due to append-only nature, new end-of-file (EOF)
* to be recorded in aoseg table has to be greater than currently
* stored EOF value, as new writes must move it forward only. If new
* end-of-file value is less than currently stored end-of-file
* something is incorrect and updating the same will yield incorrect
* result during reads. Hence abort the write transaction trying to
* update the incorrect EOF value.
*/
if (oldvpinfo->entry[i].eof <= idesc->ds[i]->eof)
{
vpinfo->entry[i].eof = idesc->ds[i]->eof;
}
else
{
elog(ERROR, "Unexpected compressed EOF for relation %s, relfilenode %u, segment file %d coln %d. "
"EOF " INT64_FORMAT " to be updated cannot be smaller than current EOF " INT64_FORMAT " in pg_aocsseg",
RelationGetRelationName(prel), prel->rd_node.relNode,
idesc->cur_segno, i, idesc->ds[i]->eof, oldvpinfo->entry[i].eof);
}
if (oldvpinfo->entry[i].eof_uncompressed <= idesc->ds[i]->eofUncompress)
{
vpinfo->entry[i].eof_uncompressed = idesc->ds[i]->eofUncompress;
}
else
{
elog(ERROR, "Unexpected EOF for relation %s, relfilenode %u, segment file %d coln %d. "
"EOF " INT64_FORMAT " to be updated cannot be smaller than current EOF " INT64_FORMAT " in pg_aocsseg",
RelationGetRelationName(prel), prel->rd_node.relNode,
idesc->cur_segno, i, idesc->ds[i]->eofUncompress, oldvpinfo->entry[i].eof_uncompressed);
}
}
if (dv != v)
{
pfree(dv);
}
d[Anum_pg_aocs_vpinfo - 1] = PointerGetDatum(vpinfo);
null[Anum_pg_aocs_vpinfo - 1] = false;
repl[Anum_pg_aocs_vpinfo - 1] = true;
newtup = heap_modify_tuple(oldtup, tupdesc, d, null, repl);
simple_heap_update(segrel, &oldtup->t_self, newtup);
pfree(newtup);
pfree(vpinfo);
systable_endscan(scan);
heap_close(segrel, RowExclusiveLock);
}
/*
* Update vpinfo column of pg_aocsseg_* by adding new
* AOCSVPInfoEntries. One VPInfoEntry is added for each newly added
* segfile (column). If empty=true, add empty VPInfoEntry's having
* eof=0.
*/
void
AOCSFileSegInfoAddVpe(Relation prel, int32 segno,
AOCSAddColumnDesc desc, int num_newcols, bool empty)
{
LockAcquireResult acquireResult;
Relation segrel;
SysScanDesc scan;
AOCSVPInfo *oldvpinfo;
AOCSVPInfo *newvpinfo;
HeapTuple oldtup = NULL;
HeapTuple newtup;
int tuple_segno = InvalidFileSegNumber;
Datum d[Natts_pg_aocsseg];
bool isNull;
bool null[Natts_pg_aocsseg] = {0,};
bool repl[Natts_pg_aocsseg] = {0,};
TupleDesc tupdesc;
int nvp = RelationGetNumberOfAttributes(prel);
/* nvp is new columns + existing columns */
int i;
int j;
if (Gp_role == GP_ROLE_UTILITY)
{
elog(ERROR, "cannot add column in utility mode, relation %s, segno %d",
RelationGetRelationName(prel), segno);
}
if (empty && Gp_role != GP_ROLE_DISPATCH)
{
elog(LOG, "Adding empty VPEntries for relation %s, segno %d",
RelationGetRelationName(prel), segno);
}
acquireResult = LockRelationNoWait(prel, AccessExclusiveLock);
if (acquireResult != LOCKACQUIRE_ALREADY_HELD && acquireResult != LOCKACQUIRE_ALREADY_CLEAR)
{
elog(ERROR, "should already have (transaction-scope) AccessExclusive"
" lock on relation %s, oid %d",
RelationGetRelationName(prel), RelationGetRelid(prel));
}
Oid segrelid;
GetAppendOnlyEntryAuxOids(prel->rd_id,
NULL,
&segrelid, NULL, NULL,
NULL, NULL);
segrel = heap_open(segrelid, RowExclusiveLock);
tupdesc = RelationGetDescr(segrel);
/*
* Since we have the segment-file entry under lock (with
* LockRelationAppendOnlySegmentFile) we can use SnapshotNow.
*/
scan = systable_beginscan(segrel, InvalidOid, false, NULL, 0, NULL);
while (segno != tuple_segno && (oldtup = systable_getnext(scan)) != NULL)
{
tuple_segno = DatumGetInt32(fastgetattr(oldtup, Anum_pg_aocs_segno, tupdesc, &isNull));
if (isNull)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("got invalid segno value NULL for tid %s",
ItemPointerToString(&oldtup->t_self))));
}
if (!HeapTupleIsValid(oldtup))
{
ereport(ERROR, (errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("AOCS rel \"%s\" segment \"%d\" does not exist",
RelationGetRelationName(prel), segno)
));
}
d[Anum_pg_aocs_segno - 1] = fastgetattr(oldtup, Anum_pg_aocs_segno,
tupdesc, &null[Anum_pg_aocs_segno - 1]);
Assert(!null[Anum_pg_aocs_segno - 1]);
Assert(DatumGetInt32(d[Anum_pg_aocs_segno - 1]) == segno);
d[Anum_pg_aocs_tupcount - 1] = fastgetattr(oldtup, Anum_pg_aocs_tupcount,
tupdesc,
&null[Anum_pg_aocs_tupcount - 1]);
Assert(!null[Anum_pg_aocs_tupcount - 1]);
d[Anum_pg_aocs_modcount - 1] = fastgetattr(oldtup, Anum_pg_aocs_modcount,
tupdesc,
&null[Anum_pg_aocs_modcount - 1]);
Assert(!null[Anum_pg_aocs_modcount - 1]);
d[Anum_pg_aocs_modcount - 1] += 1;
repl[Anum_pg_aocs_modcount - 1] = true;
/* new VPInfo having VPEntries with eof=0 */
newvpinfo = create_aocs_vpinfo(nvp);
if (!empty)
{
d[Anum_pg_aocs_vpinfo - 1] =
fastgetattr(oldtup, Anum_pg_aocs_vpinfo, tupdesc,
&null[Anum_pg_aocs_vpinfo - 1]);
Assert(!null[Anum_pg_aocs_vpinfo - 1]);
struct varlena *v = (struct varlena *) DatumGetPointer(
d[Anum_pg_aocs_vpinfo - 1]);
struct varlena *dv = pg_detoast_datum(v);
Assert(VARSIZE(dv) == aocs_vpinfo_size(nvp - num_newcols));
oldvpinfo = (AOCSVPInfo *) dv;
Assert(oldvpinfo->nEntry + num_newcols == nvp);
/* copy existing columns' eofs to new vpinfo */
for (i = 0; i < oldvpinfo->nEntry; ++i)
{
newvpinfo->entry[i].eof = oldvpinfo->entry[i].eof;
newvpinfo->entry[i].eof_uncompressed =
oldvpinfo->entry[i].eof_uncompressed;
}
/* eof for new segfiles come next */
for (i = oldvpinfo->nEntry, j = 0; i < nvp; ++i, ++j)
{
newvpinfo->entry[i].eof = desc->dsw[j]->eof;
newvpinfo->entry[i].eof_uncompressed =
desc->dsw[j]->eofUncompress;
}
if (dv != v)
{
pfree(dv);
}
}
d[Anum_pg_aocs_vpinfo - 1] = PointerGetDatum(newvpinfo);
null[Anum_pg_aocs_vpinfo - 1] = false;
repl[Anum_pg_aocs_vpinfo - 1] = true;
newtup = heap_modify_tuple(oldtup, tupdesc, d, null, repl);
simple_heap_update(segrel, &oldtup->t_self, newtup);
pfree(newtup);
pfree(newvpinfo);
/*
* Holding RowExclusiveLock lock on pg_aocsseg_* until the ALTER TABLE
* transaction commits/aborts. Additionally, we are already holding
* AccessExclusive lock on the AOCS relation OID.
*/
systable_endscan(scan);
heap_close(segrel, NoLock);
}
void
AOCSFileSegInfoAddCount(Relation prel, int32 segno,
int64 tupadded, int64 varblockadded, int64 modcount_added)
{
Relation segrel;
SysScanDesc scan;
HeapTuple oldtup = NULL;
HeapTuple newtup;
int tuple_segno = InvalidFileSegNumber;
Datum d[Natts_pg_aocsseg];
bool isNull;
bool null[Natts_pg_aocsseg] = {0,};
bool repl[Natts_pg_aocsseg] = {0,};
TupleDesc tupdesc;
Oid segrelid;
GetAppendOnlyEntryAuxOids(prel->rd_id,
NULL,
&segrelid, NULL, NULL,
NULL, NULL);
segrel = heap_open(segrelid, RowExclusiveLock);
tupdesc = RelationGetDescr(segrel);
/*
* Since we have the segment-file entry under lock (with
* LockRelationAppendOnlySegmentFile) we can use SnapshotNow.
*/
scan = systable_beginscan(segrel, InvalidOid, false, NULL, 0, NULL);
while (segno != tuple_segno && (oldtup = systable_getnext(scan)) != NULL)
{
tuple_segno = DatumGetInt32(fastgetattr(oldtup, Anum_pg_aocs_segno, tupdesc, &isNull));
if (isNull)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("got invalid segno value NULL for tid %s",
ItemPointerToString(&oldtup->t_self))));
}
if (!HeapTupleIsValid(oldtup))
ereport(ERROR, (errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("AOCS table \"%s\" file segment \"%d\" does not exist",
RelationGetRelationName(prel), segno)
));
/*
* Verify that the caller locked the segment earlier. In principle, if
* the caller is holding an AccessExclusiveLock on the table, locking
* individual tuples would not be necessary, but all current callers
* diligently lock the tuples anyway, so we can perform this sanity check
* here.
*/
if (!pg_aoseg_tuple_is_locked_by_me(oldtup))
ereport(ERROR,
(errcode(ERRCODE_INTERNAL_ERROR),
errmsg("cannot update pg_aocs entry for segno %d for relation %s, it is not locked for us",
segno, RelationGetRelationName(prel))));
#ifdef USE_ASSERT_CHECKING
d[Anum_pg_aocs_segno - 1] = fastgetattr(oldtup, Anum_pg_aocs_segno, tupdesc, &null[Anum_pg_aocs_segno - 1]);
Assert(!null[Anum_pg_aocs_segno - 1]);
Assert(DatumGetInt32(d[Anum_pg_aocs_segno - 1]) == segno);
#endif
d[Anum_pg_aocs_tupcount - 1] = fastgetattr(oldtup, Anum_pg_aocs_tupcount, tupdesc, &null[Anum_pg_aocs_tupcount - 1]);
Assert(!null[Anum_pg_aocs_tupcount - 1]);
d[Anum_pg_aocs_tupcount - 1] += tupadded;
repl[Anum_pg_aocs_tupcount - 1] = true;
d[Anum_pg_aocs_varblockcount - 1] = fastgetattr(oldtup, Anum_pg_aocs_varblockcount, tupdesc, &null[Anum_pg_aocs_varblockcount - 1]);
Assert(!null[Anum_pg_aocs_varblockcount - 1]);
d[Anum_pg_aocs_varblockcount - 1] += varblockadded;
repl[Anum_pg_aocs_varblockcount - 1] = true;
d[Anum_pg_aocs_modcount - 1] = fastgetattr(oldtup, Anum_pg_aocs_modcount, tupdesc, &null[Anum_pg_aocs_modcount - 1]);
Assert(!null[Anum_pg_aocs_modcount - 1]);
d[Anum_pg_aocs_modcount - 1] += modcount_added;
repl[Anum_pg_aocs_modcount - 1] = true;
newtup = heap_modify_tuple(oldtup, tupdesc, d, null, repl);
simple_heap_update(segrel, &oldtup->t_self, newtup);
heap_freetuple(newtup);
systable_endscan(scan);
heap_close(segrel, RowExclusiveLock);
}
extern Datum aocsvpinfo_decode(PG_FUNCTION_ARGS);
Datum
aocsvpinfo_decode(PG_FUNCTION_ARGS)
{
AOCSVPInfo *vpinfo = (AOCSVPInfo *) PG_GETARG_BYTEA_P(0);
int i = PG_GETARG_INT32(1);
int j = PG_GETARG_INT32(2);
int64 result;
if (i < 0 || i >= vpinfo->nEntry)
ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("invalid entry for decoding aocsvpinfo")
));
if (j < 0 || j > 1)
ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("invalid entry for decoding aocsvpinfo")
));
if (j == 0)
result = vpinfo->entry[i].eof;
else
result = vpinfo->entry[i].eof_uncompressed;
PG_RETURN_INT64(result);
}
PG_MODULE_MAGIC;
static Datum
gp_aocsseg_internal(PG_FUNCTION_ARGS, Oid aocsRelOid)
{
typedef struct Context
{
Oid aocsRelOid;
int relnatts;
struct AOCSFileSegInfo **aocsSegfileArray;
int totalAocsSegFiles;
int segfileArrayIndex;
int columnNum;
/* 0-based index into columns. */
} Context;
FuncCallContext *funcctx;
Context *context;
if (SRF_IS_FIRSTCALL())
{
TupleDesc tupdesc;
MemoryContext oldcontext;
Relation aocsRel;
Relation pg_aocsseg_rel;
Snapshot appendOnlyMetaDataSnapshot = RegisterSnapshot(GetLatestSnapshot());
/* 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(10);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, "segment_id",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 2, "segno",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 3, "column_num",
INT2OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 4, "physical_segno",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 5, "tupcount",
INT8OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 6, "eof",
INT8OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 7, "eof_uncompressed",
INT8OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 8, "modcount",
INT8OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 9, "formatversion",
INT2OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 10, "state",
INT2OID, -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 *) palloc(sizeof(Context));
funcctx->user_fctx = (void *) context;
context->aocsRelOid = aocsRelOid;
aocsRel = heap_open(aocsRelOid, AccessShareLock);
if (!RelationIsAoCols(aocsRel))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("'%s' is not an append-only columnar relation",
RelationGetRelationName(aocsRel))));
/* Remember the number of columns. */
context->relnatts = aocsRel->rd_rel->relnatts;
Oid segrelid;
GetAppendOnlyEntryAuxOids(aocsRel->rd_id,
appendOnlyMetaDataSnapshot,
&segrelid, NULL, NULL,
NULL, NULL);
pg_aocsseg_rel = heap_open(segrelid, AccessShareLock);
context->aocsSegfileArray = GetAllAOCSFileSegInfo_pg_aocsseg_rel(
aocsRel->rd_rel->relnatts,
RelationGetRelationName(aocsRel),
pg_aocsseg_rel,
appendOnlyMetaDataSnapshot,
&context->totalAocsSegFiles);
heap_close(pg_aocsseg_rel, AccessShareLock);
heap_close(aocsRel, AccessShareLock);
/* Iteration positions. */
context->segfileArrayIndex = 0;
context->columnNum = 0;
funcctx->user_fctx = (void *) context;
UnregisterSnapshot(appendOnlyMetaDataSnapshot);
MemoryContextSwitchTo(oldcontext);
}
funcctx = SRF_PERCALL_SETUP();
context = (Context *) funcctx->user_fctx;
/*
* Process each column for each segment file.
*/
while (true)
{
Datum values[10];
bool nulls[10];
HeapTuple tuple;
Datum result;
struct AOCSFileSegInfo *aocsSegfile;
int64 eof;
int64 eof_uncompressed;
if (context->segfileArrayIndex >= context->totalAocsSegFiles)
{
break;
}
if (context->columnNum >= context->relnatts)
{
/*
* Finished with the current segment file.
*/
context->segfileArrayIndex++;
if (context->segfileArrayIndex >= context->totalAocsSegFiles)
{
continue;
}
context->columnNum = 0;
}
/*
* Form tuple with appropriate data.
*/
MemSet(values, 0, sizeof(values));
MemSet(nulls, false, sizeof(nulls));
aocsSegfile = context->aocsSegfileArray[context->segfileArrayIndex];
if (context->columnNum >= aocsSegfile->vpinfo.nEntry)
{
/*
* AWAITING_DROP segments might be missing information for some
* (newly-added) columns.
*/
eof = -1;
eof_uncompressed = -1;
}
else
{
AOCSVPInfoEntry *entry;
entry = getAOCSVPEntry(aocsSegfile, context->columnNum);
eof = entry->eof;
eof_uncompressed = entry->eof_uncompressed;
}
values[0] = Int32GetDatum(GpIdentity.segindex);
values[1] = Int32GetDatum(aocsSegfile->segno);
values[2] = Int16GetDatum(context->columnNum);
values[3] = Int32GetDatum(context->columnNum * AOTupleId_MultiplierSegmentFileNum + aocsSegfile->segno);
values[4] = Int64GetDatum(aocsSegfile->total_tupcount);
values[5] = Int64GetDatum(eof);
values[6] = Int64GetDatum(eof_uncompressed);
values[7] = Int64GetDatum(aocsSegfile->modcount);
values[8] = Int16GetDatum(aocsSegfile->formatversion);
values[9] = Int16GetDatum(aocsSegfile->state);
tuple = heap_form_tuple(funcctx->tuple_desc, values, nulls);
result = HeapTupleGetDatum(tuple);
/* Indicate we emitted one column. */
context->columnNum++;
SRF_RETURN_NEXT(funcctx, result);
}
SRF_RETURN_DONE(funcctx);
}
PG_FUNCTION_INFO_V1(gp_aocsseg);
extern Datum gp_aocsseg(PG_FUNCTION_ARGS);
Datum
gp_aocsseg(PG_FUNCTION_ARGS)
{
int aocsRelOid = PG_GETARG_OID(0);
return gp_aocsseg_internal(fcinfo, aocsRelOid);
}
PG_FUNCTION_INFO_V1(gp_aocsseg_history);
extern Datum gp_aocsseg_history(PG_FUNCTION_ARGS);
Datum
gp_aocsseg_history(PG_FUNCTION_ARGS)
{
int aocsRelOid = PG_GETARG_OID(0);
typedef struct Context
{
Oid aocsRelOid;
int relnatts;
struct AOCSFileSegInfo **aocsSegfileArray;
int totalAocsSegFiles;
int segfileArrayIndex;
int columnNum;
/* 0-based index into columns. */
} Context;
FuncCallContext *funcctx;
Context *context;
if (SRF_IS_FIRSTCALL())
{
TupleDesc tupdesc;
MemoryContext oldcontext;
Relation aocsRel;
Relation pg_aocsseg_rel;
/* 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(10);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, "segment_id",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 2, "segno",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 3, "column_num",
INT2OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 4, "physical_segno",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 5, "tupcount",
INT8OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 6, "eof",
INT8OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 7, "eof_uncompressed",
INT8OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 8, "modcount",
INT8OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 9, "formatversion",
INT2OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 10, "state",
INT2OID, -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 *) palloc(sizeof(Context));
funcctx->user_fctx = (void *) context;
context->aocsRelOid = aocsRelOid;
aocsRel = heap_open(aocsRelOid, AccessShareLock);
if (!RelationIsAoCols(aocsRel))
{
heap_close(aocsRel, AccessShareLock);
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("'%s' is not an append-only columnar relation",
RelationGetRelationName(aocsRel))));
}
/* Remember the number of columns. */
context->relnatts = aocsRel->rd_rel->relnatts;
Oid segrelid;
GetAppendOnlyEntryAuxOids(aocsRel->rd_id,
NULL,
&segrelid, NULL, NULL,
NULL, NULL);
pg_aocsseg_rel = heap_open(segrelid, AccessShareLock);
context->aocsSegfileArray = GetAllAOCSFileSegInfo_pg_aocsseg_rel(
RelationGetNumberOfAttributes(aocsRel),
RelationGetRelationName(aocsRel),
pg_aocsseg_rel,
SnapshotAny, //Get ALL tuples from pg_aocsseg_ % including aborted and in - progress ones.
& context->totalAocsSegFiles);
heap_close(pg_aocsseg_rel, AccessShareLock);
heap_close(aocsRel, AccessShareLock);
/* Iteration positions. */
context->segfileArrayIndex = 0;
context->columnNum = 0;
funcctx->user_fctx = (void *) context;
MemoryContextSwitchTo(oldcontext);
}
funcctx = SRF_PERCALL_SETUP();
context = (Context *) funcctx->user_fctx;
/*
* Process each column for each segment file.
*/
while (true)
{
Datum values[10];
bool nulls[10];
HeapTuple tuple;
Datum result;
struct AOCSFileSegInfo *aocsSegfile;
int64 eof;
int64 eof_uncompressed;
if (context->segfileArrayIndex >= context->totalAocsSegFiles)
{
break;
}
if (context->columnNum >= context->relnatts)
{
/*
* Finished with the current segment file.
*/
context->segfileArrayIndex++;
if (context->segfileArrayIndex >= context->totalAocsSegFiles)
{
continue;
}
context->columnNum = 0;
}
/*
* Form tuple with appropriate data.
*/
MemSet(values, 0, sizeof(values));
MemSet(nulls, false, sizeof(nulls));
aocsSegfile = context->aocsSegfileArray[context->segfileArrayIndex];
if (context->columnNum >= aocsSegfile->vpinfo.nEntry)
{
/*
* AWAITING_DROP segments might be missing information for some
* (newly-added) columns
*/
eof = -1;
eof_uncompressed = -1;
}
else
{
AOCSVPInfoEntry *entry;
entry = getAOCSVPEntry(aocsSegfile, context->columnNum);
eof = entry->eof;
eof_uncompressed = entry->eof_uncompressed;
}
values[0] = Int32GetDatum(GpIdentity.segindex);
values[1] = Int32GetDatum(aocsSegfile->segno);
values[2] = Int16GetDatum(context->columnNum);
values[3] = Int32GetDatum(context->columnNum * AOTupleId_MultiplierSegmentFileNum + aocsSegfile->segno);
values[4] = Int64GetDatum(aocsSegfile->total_tupcount);
values[5] = Int64GetDatum(eof);
values[6] = Int64GetDatum(eof_uncompressed);
values[7] = Int64GetDatum(aocsSegfile->modcount);
values[8] = Int16GetDatum(aocsSegfile->formatversion);
values[9] = Int16GetDatum(aocsSegfile->state);
tuple = heap_form_tuple(funcctx->tuple_desc, values, nulls);
result = HeapTupleGetDatum(tuple);
/* Indicate we emitted one column. */
context->columnNum++;
SRF_RETURN_NEXT(funcctx, result);
}
SRF_RETURN_DONE(funcctx);
}
float8
aocol_compression_ratio_internal(Relation parentrel)
{
StringInfoData sqlstmt;
Relation aosegrel;
bool connected = false;
int proc; /* 32 bit, only holds number of segments */
int ret;
int64 eof = 0;
int64 eof_uncompressed = 0;
float8 compress_ratio = -1; /* the default, meaning "not
* available" */
Oid segrelid = InvalidOid;
GetAppendOnlyEntryAuxOids(RelationGetRelid(parentrel), NULL,
&segrelid, NULL, NULL, NULL, NULL);
Assert(OidIsValid(segrelid));
/*
* open the aoseg relation
*/
aosegrel = heap_open(segrelid, AccessShareLock);
/*
* assemble our query string.
*
* NOTE: The aocsseg (per table) system catalog lives in the gp_aoseg
* namespace, too.
*/
initStringInfo(&sqlstmt);
if (Gp_role == GP_ROLE_DISPATCH)
appendStringInfo(&sqlstmt, "select vpinfo "
"from gp_dist_random('%s.%s')",
get_namespace_name(RelationGetNamespace(aosegrel)),
RelationGetRelationName(aosegrel));
else
appendStringInfo(&sqlstmt, "select vpinfo "
"from %s.%s",
get_namespace_name(RelationGetNamespace(aosegrel)),
RelationGetRelationName(aosegrel));
heap_close(aosegrel, AccessShareLock);
PG_TRY();
{
if (SPI_OK_CONNECT != SPI_connect())
{
ereport(ERROR,
(errcode(ERRCODE_INTERNAL_ERROR),
errmsg("unable to obtain AO relation information from segment databases"),
errdetail("SPI_connect failed in get_ao_compression_ratio")));
}
connected = true;
/* Do the query. */
ret = SPI_execute(sqlstmt.data, false, 0);
proc = (int) SPI_processed;
if (ret > 0 && SPI_tuptable != NULL)
{
TupleDesc tupdesc = SPI_tuptable->tupdesc;
SPITupleTable *tuptable = SPI_tuptable;
int i;
HeapTuple tuple;
bool isnull;
Datum vpinfoDatum;
AOCSVPInfo *vpinfo;
int j;
for (i = 0; i < proc; i++)
{
/*
* Each row is a binary struct vpinfo with a variable number
* of entries on the end.
*/
tuple = tuptable->vals[i];
vpinfoDatum = heap_getattr(tuple, 1, tupdesc, &isnull);
if (isnull)
break;
vpinfo = (AOCSVPInfo *) DatumGetByteaP(vpinfoDatum);
/* CONSIDER: Better verification of vpinfo. */
Assert(vpinfo->version == 0);
for (j = 0; j < vpinfo->nEntry; j++)
{
eof += vpinfo->entry[j].eof;
eof_uncompressed += vpinfo->entry[j].eof_uncompressed;
}
}
/* guard against division by zero */
if (eof > 0)
{
/* calculate the compression ratio */
compress_ratio = (float8) eof_uncompressed / (float8) eof;
/* format to 2 digits past the decimal point */
compress_ratio = round(compress_ratio * 100.0) / 100.0;
}
}
connected = false;
SPI_finish();
}
/* Clean up in case of error. */
PG_CATCH();
{
if (connected)
SPI_finish();
/* Carry on with error handling. */
PG_RE_THROW();
}
PG_END_TRY();
pfree(sqlstmt.data);
return compress_ratio;
}
/**
* Free up seginfo array.
*/
void
FreeAllAOCSSegFileInfo(AOCSFileSegInfo **allAOCSSegInfo, int totalSegFiles)
{
Assert(allAOCSSegInfo);
for (int file_no = 0; file_no < totalSegFiles; file_no++)
{
Assert(allAOCSSegInfo[file_no] != NULL);
pfree(allAOCSSegInfo[file_no]);
}
}
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