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4c850ecec6
heapam.h previously was included in a number of widely used headers (e.g. execnodes.h, indirectly in executor.h, ...). That's problematic on its own, as heapam.h contains a lot of low-level details that don't need to be exposed that widely, but becomes more problematic with the upcoming introduction of pluggable table storage - it seems inappropriate for heapam.h to be included that widely afterwards. heapam.h was largely only included in other headers to get the HeapScanDesc typedef (which was defined in heapam.h, even though HeapScanDescData is defined in relscan.h). The better solution here seems to be to just use the underlying struct (forward declared where necessary). Similar for BulkInsertState. Another problem was that LockTupleMode was used in executor.h - parts of the file tried to cope without heapam.h, but due to the fact that it indirectly included it, several subsequent violations of that goal were not not noticed. We could just reuse the approach of declaring parameters as int, but it seems nicer to move LockTupleMode to lockoptions.h - that's not a perfect location, but also doesn't seem bad. As a number of files relied on implicitly included heapam.h, a significant number of files grew an explicit include. It's quite probably that a few external projects will need to do the same. Author: Andres Freund Reviewed-By: Alvaro Herrera Discussion: https://postgr.es/m/20190114000701.y4ttcb74jpskkcfb@alap3.anarazel.de
314 lines
8.5 KiB
C
314 lines
8.5 KiB
C
/*
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* contrib/pgrowlocks/pgrowlocks.c
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*
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* Copyright (c) 2005-2006 Tatsuo Ishii
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*
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* Permission to use, copy, modify, and distribute this software and
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* its documentation for any purpose, without fee, and without a
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* written agreement is hereby granted, provided that the above
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* copyright notice and this paragraph and the following two
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* paragraphs appear in all copies.
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*
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE TO ANY PARTY FOR DIRECT,
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* INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING
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* LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS
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* DOCUMENTATION, EVEN IF THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* THE AUTHOR SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS
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* IS" BASIS, AND THE AUTHOR HAS NO OBLIGATIONS TO PROVIDE MAINTENANCE,
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* SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*/
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#include "postgres.h"
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#include "access/heapam.h"
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#include "access/multixact.h"
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#include "access/relscan.h"
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#include "access/xact.h"
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#include "catalog/namespace.h"
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#include "catalog/pg_authid.h"
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#include "funcapi.h"
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#include "miscadmin.h"
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#include "storage/bufmgr.h"
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#include "storage/procarray.h"
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#include "utils/acl.h"
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#include "utils/builtins.h"
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#include "utils/rel.h"
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#include "utils/snapmgr.h"
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#include "utils/tqual.h"
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#include "utils/varlena.h"
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PG_MODULE_MAGIC;
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PG_FUNCTION_INFO_V1(pgrowlocks);
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/* ----------
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* pgrowlocks:
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* returns tids of rows being locked
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* ----------
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*/
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#define NCHARS 32
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typedef struct
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{
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Relation rel;
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HeapScanDesc scan;
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int ncolumns;
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} MyData;
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#define Atnum_tid 0
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#define Atnum_xmax 1
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#define Atnum_ismulti 2
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#define Atnum_xids 3
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#define Atnum_modes 4
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#define Atnum_pids 5
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Datum
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pgrowlocks(PG_FUNCTION_ARGS)
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{
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FuncCallContext *funcctx;
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HeapScanDesc scan;
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HeapTuple tuple;
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TupleDesc tupdesc;
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AttInMetadata *attinmeta;
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Datum result;
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MyData *mydata;
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Relation rel;
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if (SRF_IS_FIRSTCALL())
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{
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text *relname;
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RangeVar *relrv;
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MemoryContext oldcontext;
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AclResult aclresult;
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funcctx = SRF_FIRSTCALL_INIT();
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oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
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/* Build a tuple descriptor for our result type */
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if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
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elog(ERROR, "return type must be a row type");
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attinmeta = TupleDescGetAttInMetadata(tupdesc);
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funcctx->attinmeta = attinmeta;
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relname = PG_GETARG_TEXT_PP(0);
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relrv = makeRangeVarFromNameList(textToQualifiedNameList(relname));
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rel = relation_openrv(relrv, AccessShareLock);
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if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
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ereport(ERROR,
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(errcode(ERRCODE_WRONG_OBJECT_TYPE),
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errmsg("\"%s\" is a partitioned table",
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RelationGetRelationName(rel)),
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errdetail("Partitioned tables do not contain rows.")));
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else if (rel->rd_rel->relkind != RELKIND_RELATION)
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ereport(ERROR,
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(errcode(ERRCODE_WRONG_OBJECT_TYPE),
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errmsg("\"%s\" is not a table",
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RelationGetRelationName(rel))));
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/*
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* check permissions: must have SELECT on table or be in
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* pg_stat_scan_tables
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*/
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aclresult = pg_class_aclcheck(RelationGetRelid(rel), GetUserId(),
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ACL_SELECT);
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if (aclresult != ACLCHECK_OK)
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aclresult = is_member_of_role(GetUserId(), DEFAULT_ROLE_STAT_SCAN_TABLES) ? ACLCHECK_OK : ACLCHECK_NO_PRIV;
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if (aclresult != ACLCHECK_OK)
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aclcheck_error(aclresult, get_relkind_objtype(rel->rd_rel->relkind),
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RelationGetRelationName(rel));
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scan = heap_beginscan(rel, GetActiveSnapshot(), 0, NULL);
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mydata = palloc(sizeof(*mydata));
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mydata->rel = rel;
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mydata->scan = scan;
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mydata->ncolumns = tupdesc->natts;
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funcctx->user_fctx = mydata;
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MemoryContextSwitchTo(oldcontext);
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}
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funcctx = SRF_PERCALL_SETUP();
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attinmeta = funcctx->attinmeta;
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mydata = (MyData *) funcctx->user_fctx;
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scan = mydata->scan;
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/* scan the relation */
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while ((tuple = heap_getnext(scan, ForwardScanDirection)) != NULL)
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{
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HTSU_Result htsu;
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TransactionId xmax;
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uint16 infomask;
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/* must hold a buffer lock to call HeapTupleSatisfiesUpdate */
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LockBuffer(scan->rs_cbuf, BUFFER_LOCK_SHARE);
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htsu = HeapTupleSatisfiesUpdate(tuple,
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GetCurrentCommandId(false),
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scan->rs_cbuf);
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xmax = HeapTupleHeaderGetRawXmax(tuple->t_data);
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infomask = tuple->t_data->t_infomask;
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/*
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* A tuple is locked if HTSU returns BeingUpdated.
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*/
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if (htsu == HeapTupleBeingUpdated)
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{
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char **values;
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values = (char **) palloc(mydata->ncolumns * sizeof(char *));
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values[Atnum_tid] = (char *) DirectFunctionCall1(tidout,
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PointerGetDatum(&tuple->t_self));
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values[Atnum_xmax] = palloc(NCHARS * sizeof(char));
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snprintf(values[Atnum_xmax], NCHARS, "%d", xmax);
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if (infomask & HEAP_XMAX_IS_MULTI)
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{
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MultiXactMember *members;
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int nmembers;
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bool first = true;
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bool allow_old;
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values[Atnum_ismulti] = pstrdup("true");
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allow_old = HEAP_LOCKED_UPGRADED(infomask);
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nmembers = GetMultiXactIdMembers(xmax, &members, allow_old,
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false);
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if (nmembers == -1)
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{
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values[Atnum_xids] = "{0}";
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values[Atnum_modes] = "{transient upgrade status}";
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values[Atnum_pids] = "{0}";
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}
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else
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{
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int j;
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values[Atnum_xids] = palloc(NCHARS * nmembers);
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values[Atnum_modes] = palloc(NCHARS * nmembers);
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values[Atnum_pids] = palloc(NCHARS * nmembers);
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strcpy(values[Atnum_xids], "{");
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strcpy(values[Atnum_modes], "{");
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strcpy(values[Atnum_pids], "{");
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for (j = 0; j < nmembers; j++)
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{
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char buf[NCHARS];
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if (!first)
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{
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strcat(values[Atnum_xids], ",");
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strcat(values[Atnum_modes], ",");
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strcat(values[Atnum_pids], ",");
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}
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snprintf(buf, NCHARS, "%d", members[j].xid);
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strcat(values[Atnum_xids], buf);
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switch (members[j].status)
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{
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case MultiXactStatusUpdate:
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snprintf(buf, NCHARS, "Update");
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break;
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case MultiXactStatusNoKeyUpdate:
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snprintf(buf, NCHARS, "No Key Update");
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break;
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case MultiXactStatusForUpdate:
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snprintf(buf, NCHARS, "For Update");
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break;
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case MultiXactStatusForNoKeyUpdate:
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snprintf(buf, NCHARS, "For No Key Update");
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break;
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case MultiXactStatusForShare:
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snprintf(buf, NCHARS, "Share");
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break;
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case MultiXactStatusForKeyShare:
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snprintf(buf, NCHARS, "Key Share");
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break;
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}
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strcat(values[Atnum_modes], buf);
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snprintf(buf, NCHARS, "%d",
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BackendXidGetPid(members[j].xid));
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strcat(values[Atnum_pids], buf);
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first = false;
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}
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strcat(values[Atnum_xids], "}");
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strcat(values[Atnum_modes], "}");
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strcat(values[Atnum_pids], "}");
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}
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}
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else
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{
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values[Atnum_ismulti] = pstrdup("false");
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values[Atnum_xids] = palloc(NCHARS * sizeof(char));
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snprintf(values[Atnum_xids], NCHARS, "{%d}", xmax);
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values[Atnum_modes] = palloc(NCHARS);
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if (infomask & HEAP_XMAX_LOCK_ONLY)
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{
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if (HEAP_XMAX_IS_SHR_LOCKED(infomask))
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snprintf(values[Atnum_modes], NCHARS, "{For Share}");
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else if (HEAP_XMAX_IS_KEYSHR_LOCKED(infomask))
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snprintf(values[Atnum_modes], NCHARS, "{For Key Share}");
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else if (HEAP_XMAX_IS_EXCL_LOCKED(infomask))
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{
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if (tuple->t_data->t_infomask2 & HEAP_KEYS_UPDATED)
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snprintf(values[Atnum_modes], NCHARS, "{For Update}");
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else
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snprintf(values[Atnum_modes], NCHARS, "{For No Key Update}");
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}
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else
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/* neither keyshare nor exclusive bit it set */
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snprintf(values[Atnum_modes], NCHARS,
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"{transient upgrade status}");
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}
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else
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{
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if (tuple->t_data->t_infomask2 & HEAP_KEYS_UPDATED)
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snprintf(values[Atnum_modes], NCHARS, "{Update}");
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else
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snprintf(values[Atnum_modes], NCHARS, "{No Key Update}");
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}
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values[Atnum_pids] = palloc(NCHARS * sizeof(char));
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snprintf(values[Atnum_pids], NCHARS, "{%d}",
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BackendXidGetPid(xmax));
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}
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LockBuffer(scan->rs_cbuf, BUFFER_LOCK_UNLOCK);
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/* build a tuple */
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tuple = BuildTupleFromCStrings(attinmeta, values);
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/* make the tuple into a datum */
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result = HeapTupleGetDatum(tuple);
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/*
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* no need to pfree what we allocated; it's on a short-lived
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* memory context anyway
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*/
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SRF_RETURN_NEXT(funcctx, result);
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}
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else
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{
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LockBuffer(scan->rs_cbuf, BUFFER_LOCK_UNLOCK);
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}
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}
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heap_endscan(scan);
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heap_close(mydata->rel, AccessShareLock);
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SRF_RETURN_DONE(funcctx);
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}
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