greenplumn aovisimap 源码
greenplumn aovisimap 代码
文件路径：/src/backend/catalog/aovisimap.c
/*-------------------------------------------------------------------------
*
* aovisimap.c
* This file contains routines to support creation of append-only
* visibility map tables. This file is identical in functionality to aoseg.c
* that exists in the same directory.
*
* Copyright (c) 2013-Present VMware, Inc. or its affiliates.
*
*
* IDENTIFICATION
* src/backend/catalog/aovisimap.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/table.h"
#include "catalog/aovisimap.h"
#include "catalog/aocatalog.h"
#include "catalog/pg_opclass.h"
#include "miscadmin.h"
#include "nodes/makefuncs.h"
#include "utils/guc.h"
#include "utils/rel.h"
void
AlterTableCreateAoVisimapTable(Oid relOid)
{
Relation rel;
IndexInfo *indexInfo;
TupleDesc tupdesc;
Oid classObjectId[2];
int16 coloptions[2];
List *indexColNames;
elogif(Debug_appendonly_print_visimap, LOG,
"Create visimap for relation %d",
relOid);
/*
* Grab an exclusive lock on the target table, which we will NOT release
* until end of transaction. (This is probably redundant in all present
* uses...)
*/
rel = table_open(relOid, AccessExclusiveLock);
if (!RelationIsAppendOptimized(rel))
{
table_close(rel, NoLock);
return;
}
/* Create a tuple descriptor */
tupdesc = CreateTemplateTupleDesc(Natts_pg_aovisimap);
TupleDescInitEntry(tupdesc, (AttrNumber) 1,
"segno",
INT4OID,
-1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 2,
"first_row_no",
INT8OID,
-1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 3,
"visimap",
BYTEAOID,
-1, 0);
/* don't toast 'visibmap' */
tupdesc->attrs[2].attstorage = 'p';
/*
* Create index on segno, first_row_no.
*/
indexInfo = makeNode(IndexInfo);
indexInfo->ii_NumIndexAttrs = 2;
indexInfo->ii_NumIndexKeyAttrs = 2;
indexInfo->ii_IndexAttrNumbers[0] = 1;
indexInfo->ii_IndexAttrNumbers[1] = 2;
indexInfo->ii_Expressions = NIL;
indexInfo->ii_ExpressionsState = NIL;
indexInfo->ii_Predicate = NIL;
indexInfo->ii_PredicateState = NULL;
indexInfo->ii_Unique = true;
indexInfo->ii_Concurrent = false;
indexColNames = list_make2("segno", "first_row_no");
classObjectId[0] = INT4_BTREE_OPS_OID;
classObjectId[1] = INT8_BTREE_OPS_OID;
coloptions[0] = 0;
coloptions[1] = 0;
(void) CreateAOAuxiliaryTable(rel,
"pg_aovisimap",
RELKIND_AOVISIMAP,
tupdesc,
indexInfo, indexColNames,
classObjectId, coloptions);
table_close(rel, NoLock);
}
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