mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-07-17 22:31:08 +02:00
5d1e5c8b75
Per Coverity. BuildIndexValueDescription() cannot actually return NULL in this instance, because it only returns NULL if the user doesn't have the required privileges, and this function can only be used by superuser. But better safe than sorry.
272 lines
7.5 KiB
C
272 lines
7.5 KiB
C
/*
|
|
* gistfuncs.c
|
|
* Functions to investigate the content of GiST indexes
|
|
*
|
|
* Copyright (c) 2014-2020, PostgreSQL Global Development Group
|
|
*
|
|
* IDENTIFICATION
|
|
* contrib/pageinspect/gistfuncs.c
|
|
*/
|
|
#include "postgres.h"
|
|
|
|
#include "access/gist.h"
|
|
#include "access/gist_private.h"
|
|
#include "access/htup.h"
|
|
#include "access/relation.h"
|
|
#include "catalog/namespace.h"
|
|
#include "funcapi.h"
|
|
#include "miscadmin.h"
|
|
#include "pageinspect.h"
|
|
#include "storage/itemptr.h"
|
|
#include "utils/array.h"
|
|
#include "utils/builtins.h"
|
|
#include "utils/rel.h"
|
|
#include "utils/pg_lsn.h"
|
|
#include "utils/varlena.h"
|
|
|
|
PG_FUNCTION_INFO_V1(gist_page_opaque_info);
|
|
PG_FUNCTION_INFO_V1(gist_page_items);
|
|
PG_FUNCTION_INFO_V1(gist_page_items_bytea);
|
|
|
|
#define ItemPointerGetDatum(X) PointerGetDatum(X)
|
|
|
|
|
|
Datum
|
|
gist_page_opaque_info(PG_FUNCTION_ARGS)
|
|
{
|
|
bytea *raw_page = PG_GETARG_BYTEA_P(0);
|
|
TupleDesc tupdesc;
|
|
Page page;
|
|
GISTPageOpaque opaq;
|
|
HeapTuple resultTuple;
|
|
Datum values[4];
|
|
bool nulls[4];
|
|
Datum flags[16];
|
|
int nflags = 0;
|
|
uint16 flagbits;
|
|
|
|
if (!superuser())
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
|
|
errmsg("must be superuser to use raw page functions")));
|
|
|
|
page = get_page_from_raw(raw_page);
|
|
|
|
opaq = (GISTPageOpaque) PageGetSpecialPointer(page);
|
|
|
|
/* Build a tuple descriptor for our result type */
|
|
if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
|
|
elog(ERROR, "return type must be a row type");
|
|
|
|
/* Convert the flags bitmask to an array of human-readable names */
|
|
flagbits = opaq->flags;
|
|
if (flagbits & F_LEAF)
|
|
flags[nflags++] = CStringGetTextDatum("leaf");
|
|
if (flagbits & F_DELETED)
|
|
flags[nflags++] = CStringGetTextDatum("deleted");
|
|
if (flagbits & F_TUPLES_DELETED)
|
|
flags[nflags++] = CStringGetTextDatum("tuples_deleted");
|
|
if (flagbits & F_FOLLOW_RIGHT)
|
|
flags[nflags++] = CStringGetTextDatum("follow_right");
|
|
if (flagbits & F_HAS_GARBAGE)
|
|
flags[nflags++] = CStringGetTextDatum("has_garbage");
|
|
flagbits &= ~(F_LEAF | F_DELETED | F_TUPLES_DELETED | F_FOLLOW_RIGHT | F_HAS_GARBAGE);
|
|
if (flagbits)
|
|
{
|
|
/* any flags we don't recognize are printed in hex */
|
|
flags[nflags++] = DirectFunctionCall1(to_hex32, Int32GetDatum(flagbits));
|
|
}
|
|
|
|
memset(nulls, 0, sizeof(nulls));
|
|
|
|
values[0] = LSNGetDatum(PageGetLSN(page));
|
|
values[1] = LSNGetDatum(GistPageGetNSN(page));
|
|
values[2] = Int64GetDatum(opaq->rightlink);
|
|
values[3] = PointerGetDatum(construct_array(flags, nflags,
|
|
TEXTOID,
|
|
-1, false, TYPALIGN_INT));
|
|
|
|
/* Build and return the result tuple. */
|
|
resultTuple = heap_form_tuple(tupdesc, values, nulls);
|
|
|
|
return HeapTupleGetDatum(resultTuple);
|
|
}
|
|
|
|
Datum
|
|
gist_page_items_bytea(PG_FUNCTION_ARGS)
|
|
{
|
|
bytea *raw_page = PG_GETARG_BYTEA_P(0);
|
|
ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo;
|
|
bool randomAccess;
|
|
TupleDesc tupdesc;
|
|
Tuplestorestate *tupstore;
|
|
MemoryContext oldcontext;
|
|
Page page;
|
|
OffsetNumber offset;
|
|
|
|
if (!superuser())
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
|
|
errmsg("must be superuser to use raw page functions")));
|
|
|
|
/* check to see if caller supports us returning a tuplestore */
|
|
if (rsinfo == NULL || !IsA(rsinfo, ReturnSetInfo))
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
|
|
errmsg("set-valued function called in context that cannot accept a set")));
|
|
if (!(rsinfo->allowedModes & SFRM_Materialize))
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_SYNTAX_ERROR),
|
|
errmsg("materialize mode required, but it is not allowed in this context")));
|
|
|
|
/* The tupdesc and tuplestore must be created in ecxt_per_query_memory */
|
|
oldcontext = MemoryContextSwitchTo(rsinfo->econtext->ecxt_per_query_memory);
|
|
|
|
if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
|
|
elog(ERROR, "return type must be a row type");
|
|
|
|
randomAccess = (rsinfo->allowedModes & SFRM_Materialize_Random) != 0;
|
|
tupstore = tuplestore_begin_heap(randomAccess, false, work_mem);
|
|
rsinfo->returnMode = SFRM_Materialize;
|
|
rsinfo->setResult = tupstore;
|
|
rsinfo->setDesc = tupdesc;
|
|
|
|
MemoryContextSwitchTo(oldcontext);
|
|
|
|
page = get_page_from_raw(raw_page);
|
|
|
|
if (GistPageIsDeleted(page))
|
|
elog(NOTICE, "page is deleted");
|
|
|
|
for (offset = FirstOffsetNumber;
|
|
offset <= PageGetMaxOffsetNumber(page);
|
|
offset++)
|
|
{
|
|
Datum values[4];
|
|
bool nulls[4];
|
|
ItemId id;
|
|
IndexTuple itup;
|
|
bytea *tuple_bytea;
|
|
int tuple_len;
|
|
|
|
id = PageGetItemId(page, offset);
|
|
|
|
if (!ItemIdIsValid(id))
|
|
elog(ERROR, "invalid ItemId");
|
|
|
|
itup = (IndexTuple) PageGetItem(page, id);
|
|
tuple_len = IndexTupleSize(itup);
|
|
|
|
memset(nulls, 0, sizeof(nulls));
|
|
|
|
values[0] = DatumGetInt16(offset);
|
|
values[1] = ItemPointerGetDatum(&itup->t_tid);
|
|
values[2] = Int32GetDatum((int) IndexTupleSize(itup));
|
|
|
|
tuple_bytea = (bytea *) palloc(tuple_len + VARHDRSZ);
|
|
SET_VARSIZE(tuple_bytea, tuple_len + VARHDRSZ);
|
|
memcpy(VARDATA(tuple_bytea), itup, tuple_len);
|
|
values[3] = PointerGetDatum(tuple_bytea);
|
|
|
|
tuplestore_putvalues(tupstore, tupdesc, values, nulls);
|
|
}
|
|
|
|
return (Datum) 0;
|
|
}
|
|
|
|
Datum
|
|
gist_page_items(PG_FUNCTION_ARGS)
|
|
{
|
|
bytea *raw_page = PG_GETARG_BYTEA_P(0);
|
|
Oid indexRelid = PG_GETARG_OID(1);
|
|
ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo;
|
|
bool randomAccess;
|
|
Relation indexRel;
|
|
TupleDesc tupdesc;
|
|
Tuplestorestate *tupstore;
|
|
MemoryContext oldcontext;
|
|
Page page;
|
|
OffsetNumber offset;
|
|
|
|
if (!superuser())
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
|
|
errmsg("must be superuser to use raw page functions")));
|
|
|
|
/* check to see if caller supports us returning a tuplestore */
|
|
if (rsinfo == NULL || !IsA(rsinfo, ReturnSetInfo))
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
|
|
errmsg("set-valued function called in context that cannot accept a set")));
|
|
if (!(rsinfo->allowedModes & SFRM_Materialize))
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_SYNTAX_ERROR),
|
|
errmsg("materialize mode required, but it is not allowed in this context")));
|
|
|
|
/* The tupdesc and tuplestore must be created in ecxt_per_query_memory */
|
|
oldcontext = MemoryContextSwitchTo(rsinfo->econtext->ecxt_per_query_memory);
|
|
|
|
if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
|
|
elog(ERROR, "return type must be a row type");
|
|
|
|
randomAccess = (rsinfo->allowedModes & SFRM_Materialize_Random) != 0;
|
|
tupstore = tuplestore_begin_heap(randomAccess, false, work_mem);
|
|
rsinfo->returnMode = SFRM_Materialize;
|
|
rsinfo->setResult = tupstore;
|
|
rsinfo->setDesc = tupdesc;
|
|
|
|
MemoryContextSwitchTo(oldcontext);
|
|
|
|
/* Open the relation */
|
|
indexRel = index_open(indexRelid, AccessShareLock);
|
|
|
|
page = get_page_from_raw(raw_page);
|
|
|
|
if (GistPageIsDeleted(page))
|
|
elog(NOTICE, "page is deleted");
|
|
|
|
for (offset = FirstOffsetNumber;
|
|
offset <= PageGetMaxOffsetNumber(page);
|
|
offset++)
|
|
{
|
|
Datum values[4];
|
|
bool nulls[4];
|
|
ItemId id;
|
|
IndexTuple itup;
|
|
Datum itup_values[INDEX_MAX_KEYS];
|
|
bool itup_isnull[INDEX_MAX_KEYS];
|
|
char *key_desc;
|
|
|
|
id = PageGetItemId(page, offset);
|
|
|
|
if (!ItemIdIsValid(id))
|
|
elog(ERROR, "invalid ItemId");
|
|
|
|
itup = (IndexTuple) PageGetItem(page, id);
|
|
|
|
index_deform_tuple(itup, RelationGetDescr(indexRel),
|
|
itup_values, itup_isnull);
|
|
|
|
memset(nulls, 0, sizeof(nulls));
|
|
|
|
values[0] = DatumGetInt16(offset);
|
|
values[1] = ItemPointerGetDatum(&itup->t_tid);
|
|
values[2] = Int32GetDatum((int) IndexTupleSize(itup));
|
|
|
|
key_desc = BuildIndexValueDescription(indexRel, itup_values, itup_isnull);
|
|
if (key_desc)
|
|
values[3] = CStringGetTextDatum(key_desc);
|
|
else
|
|
{
|
|
values[3] = (Datum) 0;
|
|
nulls[3] = true;
|
|
}
|
|
|
|
tuplestore_putvalues(tupstore, tupdesc, values, nulls);
|
|
}
|
|
|
|
relation_close(indexRel, AccessShareLock);
|
|
|
|
return (Datum) 0;
|
|
}
|