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spock_apply_heap.c
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spock_apply_heap.c
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/*-------------------------------------------------------------------------
*
* spock_apply_heap.c
* spock apply functions using heap api
*
* Copyright (c) 2022-2024, pgEdge, Inc.
* Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, The Regents of the University of California
*
* IDENTIFICATION
* spock_apply_heap.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "miscadmin.h"
#include "libpq-fe.h"
#include "pgstat.h"
#include "access/commit_ts.h"
#include "access/htup_details.h"
#include "access/xact.h"
#include "catalog/namespace.h"
#include "commands/dbcommands.h"
#include "commands/sequence.h"
#include "commands/tablecmds.h"
#include "executor/executor.h"
#include "libpq/pqformat.h"
#include "mb/pg_wchar.h"
#include "nodes/makefuncs.h"
#include "nodes/parsenodes.h"
#include "optimizer/clauses.h"
#include "optimizer/optimizer.h"
#include "parser/parse_relation.h"
#include "replication/origin.h"
#include "replication/reorderbuffer.h"
#include "replication/logicalrelation.h"
#include "rewrite/rewriteHandler.h"
#include "storage/ipc.h"
#include "storage/lmgr.h"
#include "storage/proc.h"
#include "tcop/pquery.h"
#include "tcop/utility.h"
#include "utils/attoptcache.h"
#include "utils/builtins.h"
#include "utils/jsonb.h"
#include "utils/lsyscache.h"
#include "utils/memutils.h"
#include "utils/snapmgr.h"
#include "spock_common.h"
#include "spock_conflict.h"
#include "spock_executor.h"
#include "spock_node.h"
#include "spock_proto_native.h"
#include "spock_queue.h"
#include "spock_relcache.h"
#include "spock_repset.h"
#include "spock_rpc.h"
#include "spock_sync.h"
#include "spock_worker.h"
#include "spock_apply_heap.h"
#include "spock_apply.h"
#include "spock_exception_handler.h"
typedef struct ApplyExecutionData
{
EState *estate; /* executor state, used to track resources */
SpockRelation *targetRel; /* replication target rel */
ResultRelInfo *targetRelInfo; /* ResultRelInfo for same */
} ApplyExecutionData;
typedef struct ApplyExecState
{
EState *estate;
EPQState epqstate;
ResultRelInfo *resultRelInfo;
TupleTableSlot *slot;
} ApplyExecState;
/* State related to bulk insert */
typedef struct ApplyMIState
{
SpockRelation *rel;
ApplyExecState *aestate;
CommandId cid;
BulkInsertState bistate;
TupleTableSlot **buffered_tuples;
int maxbuffered_tuples;
int nbuffered_tuples;
} ApplyMIState;
typedef struct ApplyErrorCallbackArg
{
LogicalRepMsgType command; /* 0 if invalid */
LogicalRepRelMapEntry *rel;
/* Remote node information */
int remote_attnum; /* -1 if invalid */
TransactionId remote_xid;
XLogRecPtr finish_lsn;
char *origin_name;
} ApplyErrorCallbackArg;
/* errcontext tracker */
ApplyErrorCallbackArg apply_error_callback_arg =
{
.command = 0,
.rel = NULL,
.remote_attnum = -1,
.remote_xid = InvalidTransactionId,
.finish_lsn = InvalidXLogRecPtr,
.origin_name = NULL,
};
#define TTS_TUP(slot) (((HeapTupleTableSlot *)slot)->tuple)
static ApplyMIState *spkmistate = NULL;
#ifndef NO_LOG_OLD_VALUE
static void build_delta_tuple(SpockRelation *rel, SpockTupleData *oldtup,
SpockTupleData *newtup, SpockTupleData *deltatup,
TupleTableSlot *localslot);
#endif
/*
* Executor state preparation for evaluation of constraint expressions,
* indexes and triggers for the specified relation.
*
* Note that the caller must open and close any indexes to be updated.
*/
static ApplyExecutionData *
create_edata_for_relation(SpockRelation *rel)
{
ApplyExecutionData *edata;
EState *estate;
RangeTblEntry *rte;
List *perminfos = NIL;
ResultRelInfo *resultRelInfo;
edata = (ApplyExecutionData *) palloc0(sizeof(ApplyExecutionData));
edata->targetRel = rel;
edata->estate = estate = CreateExecutorState();
rte = makeNode(RangeTblEntry);
rte->rtekind = RTE_RELATION;
rte->relid = RelationGetRelid(rel->rel);
rte->relkind = rel->rel->rd_rel->relkind;
rte->rellockmode = AccessShareLock;
addRTEPermissionInfo(&perminfos, rte);
ExecInitRangeTable(estate, list_make1(rte), perminfos);
edata->targetRelInfo = resultRelInfo = makeNode(ResultRelInfo);
/*
* Use Relation opened by logicalrep_rel_open() instead of opening it
* again.
*/
InitResultRelInfo(resultRelInfo, rel->rel, 1, NULL, 0);
/*
* We put the ResultRelInfo in the es_opened_result_relations list, even
* though we don't populate the es_result_relations array. That's a bit
* bogus, but it's enough to make ExecGetTriggerResultRel() find them.
*
* ExecOpenIndices() is not called here either, each execution path doing
* an apply operation being responsible for that.
*/
estate->es_opened_result_relations =
lappend(estate->es_opened_result_relations, resultRelInfo);
estate->es_output_cid = GetCurrentCommandId(true);
/* Prepare to catch AFTER triggers. */
AfterTriggerBeginQuery();
/* other fields of edata remain NULL for now */
return edata;
}
/*
* Finish any operations related to the executor state created by
* create_edata_for_relation().
*/
static void
finish_edata(ApplyExecutionData *edata)
{
EState *estate = edata->estate;
/* Handle any queued AFTER triggers. */
AfterTriggerEndQuery(estate);
/*
* Cleanup. It might seem that we should call ExecCloseResultRelations()
* here, but we intentionally don't. It would close the rel we added to
* es_opened_result_relations above, which is wrong because we took no
* corresponding refcount. We rely on ExecCleanupTupleRouting() to close
* any other relations opened during execution.
*/
ExecResetTupleTable(estate->es_tupleTable, false);
FreeExecutorState(estate);
pfree(edata);
}
/*
* Executes default values for columns for which we can't map to remote
* relation columns.
*
* This allows us to support tables which have more columns on the downstream
* than on the upstream.
*/
static void
slot_fill_defaults(SpockRelation *rel, EState *estate,
TupleTableSlot *slot)
{
#if 0
TupleDesc desc = RelationGetDescr(rel->localrel);
int num_phys_attrs = desc->natts;
int i;
int attnum,
num_defaults = 0;
int *defmap;
ExprState **defexprs;
ExprContext *econtext;
econtext = GetPerTupleExprContext(estate);
/* We got all the data via replication, no need to evaluate anything. */
if (num_phys_attrs == rel->remoterel.natts)
return;
defmap = (int *) palloc(num_phys_attrs * sizeof(int));
defexprs = (ExprState **) palloc(num_phys_attrs * sizeof(ExprState *));
Assert(rel->attrmap->maplen == num_phys_attrs);
for (attnum = 0; attnum < num_phys_attrs; attnum++)
{
Expr *defexpr;
if (TupleDescAttr(desc, attnum)->attisdropped || TupleDescAttr(desc, attnum)->attgenerated)
continue;
if (rel->attrmap->attnums[attnum] >= 0)
continue;
defexpr = (Expr *) build_column_default(rel->localrel, attnum + 1);
if (defexpr != NULL)
{
/* Run the expression through planner */
defexpr = expression_planner(defexpr);
/* Initialize executable expression in copycontext */
defexprs[num_defaults] = ExecInitExpr(defexpr, NULL);
defmap[num_defaults] = attnum;
num_defaults++;
}
}
for (i = 0; i < num_defaults; i++)
slot->tts_values[defmap[i]] =
ExecEvalExpr(defexprs[i], econtext, &slot->tts_isnull[defmap[i]]);
#endif
}
/*
* Store tuple data into slot.
*
* Incoming data can be either text or binary format.
*/
static void
slot_store_data(TupleTableSlot *slot, SpockRelation *rel,
SpockTupleData *tupleData)
{
int natts = slot->tts_tupleDescriptor->natts;
int i;
ExecClearTuple(slot);
memset(slot->tts_values, 0, natts * sizeof(Datum));
memset(slot->tts_isnull, 1, natts * sizeof(bool));
/* Call the "in" function for each non-dropped, non-null attribute */
for (i = 0; i < rel->natts; i++)
{
int remoteattnum = rel->attmap[i];
Form_pg_attribute att = TupleDescAttr(slot->tts_tupleDescriptor, remoteattnum);
Assert(remoteattnum < natts);
if (!tupleData->nulls[remoteattnum])
{
/*
* Fill in the Datum for this attribute
*/
slot->tts_values[att->attnum - 1] = tupleData->values[remoteattnum];
slot->tts_isnull[att->attnum - 1] = false;
}
}
ExecStoreVirtualTuple(slot);
}
/*
* Store tuple data into slot from HeapTuple.
*/
static void
slot_store_htup(TupleTableSlot *slot, SpockRelation *rel,
HeapTuple htup)
{
int natts = slot->tts_tupleDescriptor->natts;
int i;
ExecClearTuple(slot);
memset(slot->tts_values, 0, natts * sizeof(Datum));
memset(slot->tts_isnull, 1, natts * sizeof(bool));
/* Call the "in" function for each non-dropped, non-null attribute */
for (i = 0; i < rel->natts; i++)
{
int remoteattnum = rel->attmap[i];
Form_pg_attribute att = TupleDescAttr(slot->tts_tupleDescriptor, remoteattnum);
Assert(remoteattnum < natts);
slot->tts_values[att->attnum - 1] = heap_getattr(htup, remoteattnum + 1,
slot->tts_tupleDescriptor,
&slot->tts_isnull[remoteattnum]);
}
ExecStoreVirtualTuple(slot);
}
/*
* Replace updated columns with data from the SpockTupleData struct.
* This is somewhat similar to heap_modify_tuple but also calls the type
* input functions on the user data.
*
* "slot" is filled with a copy of the tuple in "srcslot", replacing
* columns provided in "tupleData" and leaving others as-is.
*
* Caution: unreplaced pass-by-ref columns in "slot" will point into the
* storage for "srcslot". This is OK for current usage, but someday we may
* need to materialize "slot" at the end to make it independent of "srcslot".
*/
static void
slot_modify_data(TupleTableSlot *slot, TupleTableSlot *srcslot,
SpockRelation *rel,
SpockTupleData *tupleData)
{
int natts = slot->tts_tupleDescriptor->natts;
int i;
/* We'll fill "slot" with a virtual tuple, so we must start with ... */
ExecClearTuple(slot);
/*
* Copy all the column data from srcslot, so that we'll have valid values
* for unreplaced columns.
*/
Assert(natts == srcslot->tts_tupleDescriptor->natts);
slot_getallattrs(srcslot);
memcpy(slot->tts_values, srcslot->tts_values, natts * sizeof(Datum));
memcpy(slot->tts_isnull, srcslot->tts_isnull, natts * sizeof(bool));
/* Call the "in" function for each replaced attribute */
for (i = 0; i < rel->natts; i++)
{
int remoteattnum = rel->attmap[i];
Form_pg_attribute att = TupleDescAttr(slot->tts_tupleDescriptor, remoteattnum);
Assert(remoteattnum < natts);
if (!tupleData->nulls[remoteattnum])
{
/* Use the value from the NEW remote tuple */
slot->tts_values[att->attnum - 1] = tupleData->values[remoteattnum];
slot->tts_isnull[att->attnum - 1] = false;
}
}
/* And finally, declare that "slot" contains a valid virtual tuple */
ExecStoreVirtualTuple(slot);
}
/*
* Try to find a tuple received from the publication side (in 'remoteslot') in
* the corresponding local relation using either replica identity index,
* primary key, index or if needed, sequential scan.
*
* Local tuple, if found, is returned in '*localslot'.
*/
static bool
FindReplTupleInLocalRel(ApplyExecutionData *edata, Relation localrel,
Oid localidxoid,
TupleTableSlot *remoteslot,
TupleTableSlot **localslot)
{
EState *estate = edata->estate;
bool found;
*localslot = table_slot_create(localrel, &estate->es_tupleTable);
if (OidIsValid(localidxoid))
{
#ifdef USE_ASSERT_CHECKING
Relation idxrel = index_open(localidxoid, AccessShareLock);
/* Index must be PK, or RI */
Assert(GetRelationIdentityOrPK(localrel) == localidxoid);
index_close(idxrel, AccessShareLock);
#endif
found = RelationFindReplTupleByIndex(localrel, localidxoid,
LockTupleExclusive,
remoteslot, *localslot);
}
else
found = RelationFindReplTupleSeq(localrel, LockTupleExclusive,
remoteslot, *localslot);
return found;
}
void
spock_apply_heap_begin(void)
{
return;
}
void
spock_apply_heap_commit(void)
{
}
static bool
physatt_in_attmap(SpockRelation *rel, int attid)
{
AttrNumber i;
for (i = 0; i < rel->natts; i++)
if (rel->attmap[i] == attid)
return true;
return false;
}
/*
* Executes default values for columns for which we didn't get any data.
*
* TODO: this needs caching, it's not exactly fast.
*/
static void
fill_missing_defaults(SpockRelation *rel, EState *estate,
SpockTupleData *tuple)
{
TupleDesc desc = RelationGetDescr(rel->rel);
AttrNumber num_phys_attrs = desc->natts;
int i;
AttrNumber attnum,
num_defaults = 0;
int *defmap;
ExprState **defexprs;
ExprContext *econtext;
econtext = GetPerTupleExprContext(estate);
/* We got all the data via replication, no need to evaluate anything. */
if (num_phys_attrs == rel->natts)
return;
defmap = (int *) palloc(num_phys_attrs * sizeof(int));
defexprs = (ExprState **) palloc(num_phys_attrs * sizeof(ExprState *));
for (attnum = 0; attnum < num_phys_attrs; attnum++)
{
Expr *defexpr;
if (TupleDescAttr(desc, attnum)->attisdropped)
continue;
if (physatt_in_attmap(rel, attnum))
continue;
defexpr = (Expr *) build_column_default(rel->rel, attnum + 1);
if (defexpr != NULL)
{
/* Run the expression through planner */
defexpr = expression_planner(defexpr);
/* Initialize executable expression in copycontext */
defexprs[num_defaults] = ExecInitExpr(defexpr, NULL);
defmap[num_defaults] = attnum;
num_defaults++;
}
}
for (i = 0; i < num_defaults; i++)
tuple->values[defmap[i]] = ExecEvalExpr(defexprs[i],
econtext,
&tuple->nulls[defmap[i]],
NULL);
}
#ifndef NO_LOG_OLD_VALUE
static void
build_delta_tuple(SpockRelation *rel, SpockTupleData *oldtup,
SpockTupleData *newtup,
SpockTupleData *deltatup,
TupleTableSlot *localslot)
{
TupleDesc tupdesc = RelationGetDescr(rel->rel);
int attidx;
Datum loc_value;
Datum result;
bool loc_isnull;
Assert(rel->natts <= tupdesc->natts);
memset(deltatup->values, 0, tupdesc->natts * sizeof(Datum));
memset(deltatup->nulls, 1, tupdesc->natts * sizeof(bool));
for (attidx = 0; attidx < rel->natts; attidx++)
{
int remoteattnum = rel->attmap[attidx];
Assert(remoteattnum < tupdesc->natts);
if (rel->delta_apply_functions[remoteattnum] == InvalidOid)
{
deltatup->values[remoteattnum] = 0xdeadbeef;
deltatup->nulls[remoteattnum] = true;
deltatup->changed[remoteattnum] = false;
continue;
}
/*
* Column is marked LOG_OLD_VALUE=true. We use that as flag to apply
* the delta between the remote old and new instead of the plain new
* value.
*
* To perform the actual delta math we need the functions behind the
* '+' and '-' operators for the data type.
*
* XXX: This is currently hardcoded for the builtin data types we
* support. Ideally we would lookup those operators in the system
* cache, but that isn't straight forward and we get into all sorts of
* trouble when it comes to user defined data types and the search
* path.
*/
if (oldtup->nulls[remoteattnum])
{
/*
* This is a special case. Columns for delta apply need to be
* marked NOT NULL and LOG_OLD_VALUE=true. During this remote
* UPDATE LOG_OLD_VALUE setting was false. We use this as a flag
* to force plain NEW value application. This is useful in case a
* server ever gets out of sync.
*/
deltatup->values[remoteattnum] = newtup->values[remoteattnum];
deltatup->nulls[remoteattnum] = false;
deltatup->changed[remoteattnum] = true;
}
else
{
loc_value = heap_getattr(TTS_TUP(localslot), remoteattnum + 1, tupdesc,
&loc_isnull);
result = OidFunctionCall3Coll(rel->delta_apply_functions[remoteattnum],
InvalidOid, oldtup->values[remoteattnum],
newtup->values[remoteattnum], loc_value);
deltatup->values[remoteattnum] = result;
deltatup->nulls[remoteattnum] = false;
deltatup->changed[remoteattnum] = true;
}
}
}
#endif /* NO_LOG_OLD_VALUE */
static ApplyExecState *
init_apply_exec_state(SpockRelation *rel)
{
ApplyExecState *aestate = palloc0(sizeof(ApplyExecState));
/* Initialize the executor state. */
aestate->estate = create_estate_for_relation(rel->rel, true);
aestate->resultRelInfo = makeNode(ResultRelInfo);
InitResultRelInfo(aestate->resultRelInfo, rel->rel, 1, NULL, 0);
#if PG_VERSION_NUM < 140000
aestate->estate->es_result_relations = aestate->resultRelInfo;
aestate->estate->es_num_result_relations = 1;
aestate->estate->es_result_relation_info = aestate->resultRelInfo;
#endif
/* aestate->slot = ExecInitExtraTupleSlot(aestate->estate); */
ExecSetSlotDescriptor(aestate->slot, RelationGetDescr(rel->rel));
if (aestate->resultRelInfo->ri_TrigDesc)
EvalPlanQualInit(&aestate->epqstate, aestate->estate, NULL, NIL, -1,
NIL);
/* Prepare to catch AFTER triggers. */
AfterTriggerBeginQuery();
return aestate;
}
static void
finish_apply_exec_state(ApplyExecState *aestate)
{
/* Close indexes */
ExecCloseIndices(aestate->resultRelInfo);
/* Handle queued AFTER triggers. */
AfterTriggerEndQuery(aestate->estate);
/* Terminate EPQ execution if active. */
if (aestate->resultRelInfo->ri_TrigDesc)
{
EvalPlanQualEnd(&aestate->epqstate);
ExecCloseResultRelations(aestate->estate);
}
/* Cleanup tuple table. */
ExecResetTupleTable(aestate->estate->es_tupleTable, true);
/* Free the memory. */
FreeExecutorState(aestate->estate);
pfree(aestate);
}
/*
* Handle insert via low level api.
*/
void
spock_apply_heap_insert(SpockRelation *rel, SpockTupleData *newtup)
{
ApplyExecutionData *edata;
EState *estate;
TupleTableSlot *remoteslot;
MemoryContext oldctx;
UserContext ucxt;
/* Initialize the executor state. */
edata = create_edata_for_relation(rel);
estate = edata->estate;
remoteslot = ExecInitExtraTupleSlot(estate,
RelationGetDescr(rel->rel),
&TTSOpsVirtual);
/* update stats */
handle_stats_counter(rel->rel, MyApplyWorker->subid,
SPOCK_STATS_INSERT_COUNT, 1);
/*
* TODO: Spock used to do an all-column UPDATE if row exists on INSERT.
* With the new exception handling we now throw an error on dupkey
* (or anything else going wrong). To either get back to the old
* behavior or present the conflicting local row in the exception_log
* we need to lookup the new pkey and store the row in
* exception_log->local_tuple.
*/
/* Process and store remote tuple in the slot */
oldctx = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
slot_store_data(remoteslot, rel, newtup);
slot_fill_defaults(rel, estate, remoteslot);
MemoryContextSwitchTo(oldctx);
/* Make sure that any user-supplied code runs as the table owner. */
SwitchToUntrustedUser(rel->rel->rd_rel->relowner, &ucxt);
/* Do the actual INSERT */
ExecOpenIndices(edata->targetRelInfo, false);
ExecSimpleRelationInsert(edata->targetRelInfo, estate, remoteslot);
ExecCloseIndices(edata->targetRelInfo);
RestoreUserContext(&ucxt);
/* Cleanup */
finish_edata(edata);
}
/*
* Handle update via low level api.
*/
void
spock_apply_heap_update(SpockRelation *rel, SpockTupleData *oldtup,
SpockTupleData *newtup)
{
ApplyExecutionData *edata;
EState *estate;
EPQState epqstate;
TupleTableSlot *remoteslot;
TupleTableSlot *localslot;
HeapTuple remotetuple;
MemoryContext oldctx;
ResultRelInfo *relinfo;
bool found;
int retry;
bool clear_remoteslot = false;
bool clear_localslot = false;
/* Initialize the executor state. */
edata = create_edata_for_relation(rel);
estate = edata->estate;
remoteslot = ExecInitExtraTupleSlot(estate,
RelationGetDescr(rel->rel),
&TTSOpsVirtual);
/* update stats */
handle_stats_counter(rel->rel, MyApplyWorker->subid,
SPOCK_STATS_UPDATE_COUNT, 1);
/* Build the search tuple. */
oldctx = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
/*
* It is possible that the remoteoldtup is null because there were no
* delta-apply columns or pkey changes. In such a case, we do not try and
* reconstruct an oldtup based on pkey values and local tuple contents
* because the tuple may not exist locally.
*/
slot_store_data(remoteslot, rel, oldtup);
MemoryContextSwitchTo(oldctx);
/* Find the current local tuple */
EvalPlanQualInit(&epqstate, estate, NULL, NIL, -1, NIL);
ExecOpenIndices(edata->targetRelInfo, false);
relinfo = edata->targetRelInfo;
retry = 0;
while (retry < 5)
{
found = FindReplTupleInLocalRel(edata, relinfo->ri_RelationDesc,
edata->targetRel->idxoid,
remoteslot, &localslot);
if (found)
break;
retry++;
}
if (retry > 0)
elog(LOG, "spock_apply_heap_update() retried %d times", retry);
/*
* Perform the UPDATE if Tuple found.
*
* Note this will fail if there are other conflicting unique indexes.
*/
if (found)
{
TransactionId xmin;
TimestampTz local_ts;
RepOriginId local_origin;
bool local_origin_found;
bool apply;
HeapTuple applytuple;
HeapTuple local_tuple;
SpockConflictResolution resolution;
SpockExceptionLog *exception_log = &exception_log_ptr[my_exception_log_index];
bool is_delta_apply = false;
/*
* Fetch the contents of the local slot and store it in the error log
*/
local_tuple = ExecFetchSlotHeapTuple(localslot, true, &clear_localslot);
exception_log->local_tuple = local_tuple;
/* Process and store remote tuple in the slot */
oldctx = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
MemoryContextSwitchTo(oldctx);
remotetuple = ExecFetchSlotHeapTuple(remoteslot, true,
&clear_remoteslot);
local_origin_found = get_tuple_origin(rel, TTS_TUP(localslot),
&(localslot->tts_tid), &xmin,
&local_origin, &local_ts);
apply = try_resolve_conflict(rel->rel, TTS_TUP(localslot),
remotetuple, &applytuple,
local_origin, local_ts,
&resolution);
/*
* If remote tuple won we go forward with that as a base.
*/
if (apply && applytuple == remotetuple)
{
slot_modify_data(remoteslot, localslot, rel, newtup);
}
else
{
spock_report_conflict(CONFLICT_UPDATE_UPDATE, rel,
TTS_TUP(localslot), oldtup,
remotetuple, applytuple, resolution,
xmin, local_origin_found, local_origin,
local_ts, rel->idxoid,
true /* FIXME: unused in the call chain */ );
}
if (rel->has_delta_columns)
{
SpockTupleData deltatup;
HeapTuple currenttuple;
/*
* Depending on previous conflict resolution our final NEW tuple
* will be based on either the incoming remote tuple or the
* existing local one and then the delta processing on top of
* that.
*/
if (apply)
{
currenttuple = ExecFetchSlotHeapTuple(remoteslot, true,
&clear_localslot);
}
else
{
currenttuple = ExecFetchSlotHeapTuple(localslot, true,
&clear_localslot);
}
oldctx = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
build_delta_tuple(rel, oldtup, newtup, &deltatup, localslot);
if (!apply)
{
/*
* We are overriding apply=false because of delta apply.
*/
apply = true;
is_delta_apply = true;
/* Count the DCA event in stats */
handle_stats_counter(rel->rel, MyApplyWorker->subid,
SPOCK_STATS_DCA_COUNT, 1);
}
applytuple = heap_modify_tuple(currenttuple,
RelationGetDescr(rel->rel),
deltatup.values,
deltatup.nulls,
deltatup.changed);
MemoryContextSwitchTo(oldctx);
slot_store_htup(remoteslot, rel, applytuple);
}
/*
* Finally do the actual tuple update if needed.
*/
if (apply)
{
UserContext ucxt;
/* Make sure that any user-supplied code runs as the table owner. */
SwitchToUntrustedUser(rel->rel->rd_rel->relowner, &ucxt);
/*
* If this is a forced delta-apply we execute it in a
* subtransaction and record the local_ts & local_origin
* for CommitTsData override.
*/
if (is_delta_apply)
BeginInternalSubTransaction("SpockDeltaApply");
EvalPlanQualSetSlot(&epqstate, remoteslot);
ExecSimpleRelationUpdate(edata->targetRelInfo, estate, &epqstate,
localslot, remoteslot);
if (is_delta_apply)
{
SubTransactionIdSetCommitTsData(GetCurrentTransactionId(),
local_ts, local_origin);
ReleaseCurrentSubTransaction();
}
RestoreUserContext(&ucxt);
}
}
else
{
SpockExceptionLog *exception_log = &exception_log_ptr[my_exception_log_index];
/*
* The tuple to be updated could not be found. Do nothing except for
* emitting a log message. TODO: Add pkey information as well.
*/
exception_log->local_tuple = NULL;
elog(ERROR,
"logical replication did not find row to be updated "
"in replication target relation (%s.%s)", rel->nspname,
RelationGetRelationName(rel->rel));
}
/* Cleanup. */
if (clear_remoteslot)
ExecClearTuple(remoteslot);
if (clear_localslot)
ExecClearTuple(localslot);
ExecCloseIndices(edata->targetRelInfo);
EvalPlanQualEnd(&epqstate);
finish_edata(edata);
}
/*
* Handle delete via low level api.
*/
void
spock_apply_heap_delete(SpockRelation *rel, SpockTupleData *oldtup)
{
ApplyExecutionData *edata;
EState *estate;
EPQState epqstate;
TupleTableSlot *remoteslot;
TupleTableSlot *localslot;
MemoryContext oldctx;
ResultRelInfo *relinfo;
HeapTuple local_tuple;
bool found;
bool clear_localslot = false;
int retry;
/* Initialize the executor state. */
edata = create_edata_for_relation(rel);
estate = edata->estate;
remoteslot = ExecInitExtraTupleSlot(estate,
RelationGetDescr(rel->rel),
&TTSOpsVirtual);
/* update stats */
handle_stats_counter(rel->rel, MyApplyWorker->subid,
SPOCK_STATS_UPDATE_COUNT, 1);
/* Build the search tuple. */
oldctx = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
/*
* It is possible that the remoteoldtup is null because there were no
* delta-apply columns or pkey changes. In such a case, we do not try and
* reconstruct an oldtup based on pkey values and local tuple contents
* because the tuple may not exist locally.
*/
slot_store_data(remoteslot, rel, oldtup);
MemoryContextSwitchTo(oldctx);
/* Find the current local tuple */
EvalPlanQualInit(&epqstate, estate, NULL, NIL, -1, NIL);
ExecOpenIndices(edata->targetRelInfo, false);
relinfo = edata->targetRelInfo;
retry = 0;
while (retry < 5)
{
found = FindReplTupleInLocalRel(edata, relinfo->ri_RelationDesc,
edata->targetRel->idxoid,
remoteslot, &localslot);
if (found)
break;
retry++;
}
ExecClearTuple(remoteslot);
if (retry > 0)
elog(LOG, "spock_apply_heap_delete() retried %d times", retry);
/*
* Perform the DELETE if Tuple found.
*
* Note this will fail if there are other conflicting unique indexes.
*/
if (found)
{
UserContext ucxt;
SpockExceptionLog *exception_log = &exception_log_ptr[my_exception_log_index];
/*
* Fetch the contents of the local slot and store it in the error log