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table_log.c
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table_log.c
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/*
* table_log () -- log changes to another table
*
*
* see README.md for details
*
*
* written by Andreas ' ads' Scherbaum (ads@pgug.de)
*
*/
#include "table_log.h"
#include <ctype.h> /* tolower () */
#include <string.h> /* strlen() */
#include "postgres.h"
#include "fmgr.h"
#include "executor/spi.h" /* this is what you need to work with SPI */
#include "catalog/namespace.h"
#include "commands/trigger.h" /* -"- and triggers */
#include "mb/pg_wchar.h" /* support for the quoting functions */
#include "miscadmin.h"
#include "lib/stringinfo.h"
#include "utils/builtins.h"
#include "utils/formatting.h"
#include "utils/guc.h"
#include <utils/lsyscache.h>
#include <utils/rel.h>
#include <utils/timestamp.h>
#include <utils/syscache.h>
#include "funcapi.h"
#if PG_VERSION_NUM >= 90300
#include "access/htup_details.h"
#endif
#if PG_VERSION_NUM >= 100000
#include "utils/varlena.h" /* SplitIdentifierString */
#endif
#if PG_VERSION_NUM >= 120000
#include "access/table.h"
#endif
#if PG_VERSION_NUM < 100000
/* from src/include/access/tupdesc.h, introduced in 2cd708452 */
#define TupleDescAttr(tupdesc, i) ((tupdesc)->attrs[(i)])
#endif
/* for PostgreSQL >= 8.2.x */
#ifdef PG_MODULE_MAGIC
PG_MODULE_MAGIC;
#endif
#ifndef PG_NARGS
/*
* Get number of arguments passed to function.
* this macro isnt defined in 7.2.x
*/
#define PG_NARGS() (fcinfo->nargs)
#endif
/*
* Current active log table partition. Default is always zero.
*/
TableLogPartitionId tableLogActivePartitionId = 0;
/*
* table_log restore descriptor.
*
* Carries all information to restore data from a table_log table
*/
typedef struct
{
char *schema;
char *relname;
} TableLogRelIdent;
/*
* table_log logging descriptor for log triggers.
*/
typedef struct
{
/*
* Pointer to trigger data
*/
TriggerData *trigdata;
/*
* Number of columns of source table (excludes
* dropped columns!)
*/
int number_columns;
/*
* Number of columns of log table (excludes
* dropped columns!)
*/
int number_columns_log;
/*
* Name/schema of the log table
*/
TableLogRelIdent ident_log;
/*
* Log session user
*/
int use_session_user;
} TableLogDescr;
/*
* table_log restore descriptor structure.
*/
typedef struct
{
/* Non-qualified relation name
* of original table.
*/
char *orig_relname;
/*
* OID of original table, saved
* for cache lookup.
*/
Oid orig_relid;
/*
* List of attnums of original table part
* of the primary key or unique constraint. Only
* used in case of no explicit specified pk column.
* (see relationGetPrimaryKeyColumns() for details).
*/
AttrNumber *orig_pk_attnum;
/*
* Number of pk attributes in original tables.
*/
int orig_num_pk_attnums;
/*
* List of attribute names. The list index matches
* the attribute number stored in the orig_pk_attnum
* array.
*/
List *orig_pk_attr_names;
/*
* OID of log table.
*/
Oid log_relid;
/*
* Possible schema qualified relation name
* of log table.
*/
bool use_schema_log;
union
{
TableLogRelIdent ident_log;
char *relname_log;
};
/*
* Primary key column name of the log table.
*/
char *pkey_log;
/*
* OID of restore table.
*/
Oid restore_relid;
/*
* Possible schema qualified relation name
* of restore table.
*/
bool use_schema_restore;
union
{
TableLogRelIdent ident_restore;
char *relname_restore;
};
} TableLogRestoreDescr;
#define DESCR_TRIGDATA(a) \
(a).trigdata
#define DESCR_TRIGDATA_GET_TUPDESC(a) \
(a).trigdata->tg_relation->rd_att
#define DESCR_TRIGDATA_GET_RELATION(a) \
(a).trigdata->tg_relation
#define DESCR_TRIGDATA_GETARG(a, index) \
(a).trigdata->tg_trigger->tgargs[(index)]
#define DESCR_TRIGDATA_NARGS(a) \
(a).trigdata->tg_trigger->tgnargs
#define DESCR_TRIGDATA_GET_TUPLE(a) \
(a).trigdata->tg_trigtuple
#define DESCR_TRIGDATA_GET_NEWTUPLE(a) \
(a).trigdata->tg_newtuple
#define DESCR_TRIGDATA_LOG_SCHEMA(a) \
(a).trigdata->tg_trigger->tgargs[2]
#define DESCR_TRIGDATA_LOG_SESSION_USER(a) \
(a).trigdata->tg_trigger->tgargs[1]
#define RESTORE_TABLE_IDENT(a, type) \
((a.use_schema_##type ) \
? quote_qualified_identifier(a.ident_##type.schema, \
a.ident_##type.relname)\
: quote_identifier(a.relname_##type))
#if PG_VERSION_NUM < 90300
#define TABLE_LOG_NSPOID(a) LookupExplicitNamespace((a));
#else
#define TABLE_LOG_NSPOID(a) LookupExplicitNamespace((a), false);
#endif
void _PG_init(void);
Datum table_log(PG_FUNCTION_ARGS);
Datum table_log_basic(PG_FUNCTION_ARGS);
Datum table_log_restore_table(PG_FUNCTION_ARGS);
static char *do_quote_ident(char *iptr);
static char *do_quote_literal(char *iptr);
static void __table_log (TableLogDescr *descr,
char *changed_mode,
char *changed_tuple,
HeapTuple tuple);
static void table_log_prepare(TableLogDescr *descr);
static void table_log_finalize(void);
static void __table_log_restore_table_insert(SPITupleTable *spi_tuptable,
char *table_restore,
char *table_orig_pkey,
char *col_query_start,
int col_pkey,
int number_columns,
int i);
static void __table_log_restore_table_update(SPITupleTable *spi_tuptable,
char *table_restore,
char *table_orig_pkey,
char *col_query_start,
int col_pkey,
int number_columns,
int i,
char *old_key_string);
static void __table_log_restore_table_delete(SPITupleTable *spi_tuptable,
char *table_restore,
char *table_orig_pkey,
char *col_query_start,
int col_pkey,
int number_columns,
int i);
static char *__table_log_varcharout(VarChar *s);
static int count_columns (TupleDesc tupleDesc);
static void mapPrimaryKeyColumnNames(TableLogRestoreDescr *restore_descr);
static void setTableLogRestoreDescr(TableLogRestoreDescr *restore_descr,
char *table_orig,
char *table_orig_pkey,
char *table_log,
char *table_log_pkey,
char *table_restore);
static void getRelationPrimaryKeyColumns(TableLogRestoreDescr *restore_descr);
/* this is a V1 (new) function */
/* the trigger function */
PG_FUNCTION_INFO_V1(table_log);
PG_FUNCTION_INFO_V1(table_log_basic);
PG_FUNCTION_INFO_V1(table_log_forward);
/* build only, if the 'Table Function API' is available */
#ifdef FUNCAPI_H_not_implemented
/* restore one single column */
PG_FUNCTION_INFO_V1(table_log_show_column);
#endif /* FUNCAPI_H */
/* restore a full table */
PG_FUNCTION_INFO_V1(table_log_restore_table);
/*
* Initialize table_log module and various internal
* settings like customer variables.
*/
void _PG_init(void)
{
DefineCustomIntVariable("table_log.active_partition",
"Sets the current active partition identifier.",
NULL,
&tableLogActivePartitionId,
0,
0,
MAX_TABLE_LOG_PARTITIONS - 1,
PGC_SUSET,
0,
NULL,
NULL,
NULL);
}
/*
* Returns a fully formatted log table relation name
* of the current active log table partition.
*
* The table_name argument is adjusted to match either a single
* table or a partitioned log table with _n appended, where n matches
* the current selected active partition id
* (see tableLogActivePartitionId).
*/
static inline char *getActiveLogTable(TriggerData *tg_data)
{
bool use_partitions = false;
StringInfo buf = makeStringInfo();
/*
* If we use several partitions for the log table, append
* the partition id.
*/
if (tg_data->tg_trigger->tgnargs == 4)
{
/*
* Examine trigger argument list. We expect the
* partition mode to be the 4th argument to the table_log()
* trigger. In case no argument was specified, we know that
* we are operating on an old version, so assume
* a non-partitioned installation automatically.
*/
if (strcmp(tg_data->tg_trigger->tgargs[3], "PARTITION") == 0)
{
/* Partition support enabled */
use_partitions = true;
}
}
if (tg_data->tg_trigger->tgnargs > 0)
{
appendStringInfoString(buf, tg_data->tg_trigger->tgargs[0]);
}
else
{
/*
* We must deal with no arguments given to the trigger. In this
* case the log table name is the same like the table we are
* called on, plus the _log appended...
*/
appendStringInfo(buf, "%s_log", SPI_getrelname(tg_data->tg_relation));
}
if (use_partitions)
{
/*
* Append the current active partition id, if partitioning
* support is used.
*/
appendStringInfo(buf, "_%u", tableLogActivePartitionId);
}
/* ...and we're done */
return buf->data;
}
/*
* count_columns (TupleDesc tupleDesc)
* Will count and return the number of columns in the table described by
* tupleDesc. It needs to ignore dropped columns.
*/
static int count_columns (TupleDesc tupleDesc)
{
int count = 0;
int i;
for (i = 0; i < tupleDesc->natts; ++i)
{
if (!TupleDescAttr(tupleDesc, i)->attisdropped)
{
++count;
}
}
return count;
}
/*
* Initialize a TableLogDescr descriptor structure.
*/
static void initTableLogDescr(TableLogDescr *descr,
TriggerData *trigdata)
{
Assert(descr != NULL);
descr->trigdata = trigdata;
descr->number_columns = -1;
descr->number_columns_log = -1;
descr->ident_log.schema = NULL;
descr->ident_log.relname = NULL;
descr->use_session_user = 0;
}
/*
* table_log_internal()
*
* Internal function to initialize all required stuff
* for table_log() or table_log_basic().
*
* Requires a TableLogDescr structure previously
* initialized via initTableLogDescr().
*/
static void table_log_prepare(TableLogDescr *descr)
{
int ret;
StringInfo query;
/* must only be called for ROW trigger */
if (TRIGGER_FIRED_FOR_STATEMENT(descr->trigdata->tg_event))
{
elog(ERROR, "table_log: can't process STATEMENT events");
}
/* must only be called AFTER */
if (TRIGGER_FIRED_BEFORE(descr->trigdata->tg_event))
{
elog(ERROR, "table_log: must be fired after event");
}
/* now connect to SPI manager */
ret = SPI_connect();
if (ret != SPI_OK_CONNECT)
{
elog(ERROR, "table_log: SPI_connect returned %d", ret);
}
elog(DEBUG2, "prechecks done, now getting original table attributes");
descr->number_columns = count_columns(DESCR_TRIGDATA_GET_TUPDESC((*descr)));
if (descr->number_columns < 1)
{
elog(ERROR, "table_log: number of columns in table is < 1, can this happen?");
}
elog(DEBUG2, "number columns in orig table: %i", descr->number_columns);
if (DESCR_TRIGDATA_NARGS((*descr)) > 4)
{
elog(ERROR, "table_log: too many arguments to trigger");
}
/* name of the log schema */
if (DESCR_TRIGDATA_NARGS((*descr)) <= 2)
{
/* if no explicit schema specified, use source table schema */
descr->ident_log.schema = get_namespace_name(RelationGetNamespace(DESCR_TRIGDATA_GET_RELATION((*descr))));
}
else
{
descr->ident_log.schema = DESCR_TRIGDATA_LOG_SCHEMA((*descr));
}
/* name of the log table */
descr->ident_log.relname = getActiveLogTable(DESCR_TRIGDATA((*descr)));
/* should we write the current user? */
if (DESCR_TRIGDATA_NARGS((*descr)) > 1)
{
/*
* check if a second argument is given
* if yes, use it, if it is true
*/
if (atoi(DESCR_TRIGDATA_LOG_SESSION_USER((*descr))) == 1)
{
descr->use_session_user = 1;
elog(DEBUG2, "will write session user to 'trigger_user'");
}
}
elog(DEBUG2, "log table: %s.%s",
quote_identifier(descr->ident_log.schema),
quote_identifier(descr->ident_log.relname));
/* get the number columns in the table */
query = makeStringInfo();
appendStringInfo(query, "%s.%s",
do_quote_ident(descr->ident_log.schema),
do_quote_ident(descr->ident_log.relname));
descr->number_columns_log = count_columns(RelationNameGetTupleDesc(query->data));
if (descr->number_columns_log < 1)
{
elog(ERROR, "could not get number columns in relation %s.%s",
quote_identifier(descr->ident_log.schema),
quote_identifier(descr->ident_log.relname));
}
elog(DEBUG2, "number columns in log table: %i",
descr->number_columns_log);
/*
* check if the logtable has 3 (or now 4) columns more than our table
* +1 if we should write the session user
*/
if (descr->use_session_user == 0)
{
/* without session user */
if ((descr->number_columns_log != descr->number_columns + 3)
&& (descr->number_columns_log != descr->number_columns + 4))
{
elog(ERROR, "number colums in relation %s(%d) does not match columns in %s.%s(%d)",
SPI_getrelname(DESCR_TRIGDATA_GET_RELATION((*descr))),
descr->number_columns,
quote_identifier(descr->ident_log.schema),
quote_identifier(descr->ident_log.relname),
descr->number_columns_log);
}
}
else
{
/* with session user */
if ((descr->number_columns_log != descr->number_columns + 3 + 1)
&& (descr->number_columns_log != descr->number_columns + 4 + 1))
{
elog(ERROR, "number colums in relation %s does not match columns in %s.%s",
SPI_getrelname(DESCR_TRIGDATA_GET_RELATION((*descr))),
quote_identifier(descr->ident_log.schema),
quote_identifier(descr->ident_log.relname));
}
}
elog(DEBUG2, "log table OK");
/* For each column in key ... */
elog(DEBUG2, "copy data ...");
}
static void table_log_finalize()
{
/* ...for now only SPI needs to be cleaned up. */
SPI_finish();
}
/*
* table_log_forward
*
* Trigger function with the same core functionality
* than table_log(), but without the possibility to do
* backward log replay. This means that NEW tuples for UPDATE
* actions aren't logged, which makes the log table much smaller
* in case someone have a heavy updated source table.
*/
Datum table_log_basic(PG_FUNCTION_ARGS)
{
TableLogDescr log_descr;
/*
* Some checks first...
*/
elog(DEBUG2, "start table_log()");
/* called by trigger manager? */
if (!CALLED_AS_TRIGGER(fcinfo))
{
elog(ERROR, "table_log: not fired by trigger manager");
}
/*
* Assign trigger data structure to table log descriptor.
*/
initTableLogDescr(&log_descr,
(TriggerData *) fcinfo->context);
/*
* Do all the preparing leg work...
*/
table_log_prepare(&log_descr);
if (TRIGGER_FIRED_BY_INSERT(DESCR_TRIGDATA(log_descr)->tg_event))
{
/* trigger called from INSERT */
elog(DEBUG2, "mode: INSERT -> new");
__table_log(&log_descr,
"INSERT",
"new",
DESCR_TRIGDATA_GET_TUPLE(log_descr));
}
else if (TRIGGER_FIRED_BY_UPDATE(DESCR_TRIGDATA(log_descr)->tg_event))
{
elog(DEBUG2, "mode: UPDATE -> old");
__table_log(&log_descr,
"UPDATE",
"old",
DESCR_TRIGDATA_GET_TUPLE(log_descr));
}
else if (TRIGGER_FIRED_BY_DELETE(DESCR_TRIGDATA(log_descr)->tg_event))
{
/* trigger called from DELETE */
elog(DEBUG2, "mode: DELETE -> old");
__table_log(&log_descr,
"DELETE",
"old",
DESCR_TRIGDATA_GET_TUPLE(log_descr));
}
else
{
elog(ERROR, "trigger fired by unknown event");
}
elog(DEBUG2, "cleanup, trigger done");
table_log_finalize();
/* return trigger data */
return PointerGetDatum(DESCR_TRIGDATA_GET_TUPLE(log_descr));
}
/*
table_log()
trigger function for logging table changes
parameter:
- log table name (optional)
return:
- trigger data (for Pg)
*/
Datum table_log(PG_FUNCTION_ARGS)
{
TableLogDescr log_descr;
/*
* Some checks first...
*/
elog(DEBUG2, "start table_log()");
/* called by trigger manager? */
if (!CALLED_AS_TRIGGER(fcinfo))
{
elog(ERROR, "table_log: not fired by trigger manager");
}
/*
* Assign trigger data structure to table log descriptor.
*/
initTableLogDescr(&log_descr,
(TriggerData *) fcinfo->context);
/*
* Do all the preparing leg work...
*/
table_log_prepare(&log_descr);
if (TRIGGER_FIRED_BY_INSERT(DESCR_TRIGDATA(log_descr)->tg_event))
{
/* trigger called from INSERT */
elog(DEBUG2, "mode: INSERT -> new");
__table_log(&log_descr,
"INSERT",
"new",
DESCR_TRIGDATA_GET_TUPLE(log_descr));
}
else if (TRIGGER_FIRED_BY_UPDATE(DESCR_TRIGDATA(log_descr)->tg_event))
{
/* trigger called from UPDATE */
elog(DEBUG2, "mode: UPDATE -> old");
__table_log(&log_descr,
"UPDATE",
"old",
DESCR_TRIGDATA_GET_TUPLE(log_descr));
elog(DEBUG2, "mode: UPDATE -> new");
__table_log(&log_descr,
"UPDATE",
"new",
DESCR_TRIGDATA_GET_NEWTUPLE(log_descr));
}
else if (TRIGGER_FIRED_BY_DELETE(DESCR_TRIGDATA(log_descr)->tg_event))
{
/* trigger called from DELETE */
elog(DEBUG2, "mode: DELETE -> old");
__table_log(&log_descr,
"DELETE",
"old",
DESCR_TRIGDATA_GET_TUPLE(log_descr));
}
else
{
elog(ERROR, "trigger fired by unknown event");
}
elog(DEBUG2, "cleanup, trigger done");
table_log_finalize();
/* return trigger data */
return PointerGetDatum(DESCR_TRIGDATA_GET_TUPLE(log_descr));
}
/*
__table_log()
helper function for table_log()
parameter:
- trigger data
- change mode (INSERT, UPDATE, DELETE)
- tuple to log (old, new)
- pointer to tuple
- number columns in table
- logging table
- flag for writing session user
return:
none
*/
static void __table_log (TableLogDescr *descr,
char *changed_mode,
char *changed_tuple,
HeapTuple tuple)
{
StringInfo query;
char *before_char;
int i;
int col_nr;
int found_col;
int ret;
elog(DEBUG2, "build query");
/* allocate memory */
query = makeStringInfo();
/* build query */
appendStringInfo(query, "INSERT INTO %s.%s (",
do_quote_ident(descr->ident_log.schema),
do_quote_ident(descr->ident_log.relname));
/* add colum names */
col_nr = 0;
for (i = 1; i <= descr->number_columns; i++)
{
col_nr++;
found_col = 0;
do
{
if (TupleDescAttr(DESCR_TRIGDATA_GET_TUPDESC(*descr), col_nr - 1)->attisdropped)
{
/* this column is dropped, skip it */
col_nr++;
continue;
}
else
{
found_col++;
}
}
while (found_col == 0);
appendStringInfo(query,
"%s, ",
do_quote_ident(SPI_fname(DESCR_TRIGDATA_GET_TUPDESC((*descr)), col_nr)));
}
/* add session user */
if (descr->use_session_user == 1)
appendStringInfo(query, "trigger_user, ");
/* add the 3 extra colum names */
appendStringInfo(query, "trigger_mode, trigger_tuple, trigger_changed) VALUES (");
/* add values */
col_nr = 0;
for (i = 1; i <= descr->number_columns; i++)
{
col_nr++;
found_col = 0;
do
{
if (TupleDescAttr(DESCR_TRIGDATA_GET_TUPDESC(*descr), col_nr - 1)->attisdropped)
{
/* this column is dropped, skip it */
col_nr++;
continue;
}
else
{
found_col++;
}
}
while (found_col == 0);
before_char = SPI_getvalue(tuple,
DESCR_TRIGDATA_GET_TUPDESC((*descr)),
col_nr);
if (before_char == NULL)
{
appendStringInfo(query, "NULL, ");
}
else
{
appendStringInfo(query, "%s, ",
do_quote_literal(before_char));
}
}
/* add session user */
if (descr->use_session_user == 1)
appendStringInfo(query, "SESSION_USER, ");
/* add the 3 extra values */
appendStringInfo(query, "%s, %s, NOW());",
do_quote_literal(changed_mode),
do_quote_literal(changed_tuple));
elog(DEBUG3, "query: %s", query->data);
elog(DEBUG2, "execute query");
/* execute insert */
ret = SPI_exec(query->data, 0);
if (ret != SPI_OK_INSERT)
{
elog(ERROR, "could not insert log information into relation %s.%s (error: %d)",
quote_identifier(descr->ident_log.schema),
quote_identifier(descr->ident_log.relname),
ret);
}
/* clean up */
pfree(query->data);
pfree(query);
elog(DEBUG2, "done");
}
#ifdef FUNCAPI_H_not_implemented
/*
table_log_show_column()
show a single column on a date in the past
parameter:
not yet defined
return:
not yet defined
*/
Datum table_log_show_column(PG_FUNCTION_ARGS)
{
TriggerData *trigdata = (TriggerData *) fcinfo->context;
int ret;
/*
* Some checks first...
*/
elog(DEBUG2, "start table_log_show_column()");
/* Connect to SPI manager */
ret = SPI_connect();
if (ret != SPI_OK_CONNECT)
{
elog(ERROR, "table_log_show_column: SPI_connect returned %d", ret);
}
elog(DEBUG2, "this function isnt available yet");
/* close SPI connection */
SPI_finish();
return PG_RETURN_NULL;
}
#endif /* FUNCAPI_H */
/*
* Retrieves the columns of the primary key the original
* table has and stores their attribute numbers in the
* specified TableLogRestoreDescr descriptor. The caller is responsible
* to pass a valid descriptor initialized by initTableLogRestoreDescr().
*/
static void getRelationPrimaryKeyColumns(TableLogRestoreDescr *restore_descr)
{
Relation origRel;
List *indexOidList;
ListCell *indexOidScan;
Assert((restore_descr != NULL)
&& (restore_descr->orig_relname != NULL));
restore_descr->orig_pk_attnum = NULL;
/*
* Get all indexes for the relation, take care to
* request a share lock before.
*/
#if PG_VERSION_NUM >= 120000
origRel = table_open(restore_descr->orig_relid, AccessShareLock);
#else
origRel = heap_open(restore_descr->orig_relid, AccessShareLock);
#endif
indexOidList = RelationGetIndexList(origRel);
foreach(indexOidScan, indexOidList)
{
Oid indexOid = lfirst_oid(indexOidScan);
Form_pg_index indexStruct;
HeapTuple indexTuple;
int i;
/*
* Lookup the key via syscache, extract the key columns
* from this index in case we have found a primary key.
*/
indexTuple = SearchSysCache1(INDEXRELID,
ObjectIdGetDatum(indexOid));
if (!HeapTupleIsValid(indexTuple))
elog(ERROR, "cache lookup failed for index %u", indexOid);
indexStruct = (Form_pg_index) GETSTRUCT(indexTuple);
/*
* Next one if this is not a primary key or
* unique constraint.
*/
if (!indexStruct->indisprimary)
{
ReleaseSysCache(indexTuple);
continue;
}
/*
* Okay, looks like this is a PK let's
* get the attnums from it and store them
* in the TableLogRestoreDescr descriptor.
*/
restore_descr->orig_num_pk_attnums = indexStruct->indnatts;
restore_descr->orig_pk_attnum = (AttrNumber *) palloc(indexStruct->indnatts
* sizeof(AttrNumber));
for (i = 0; i < indexStruct->indnatts; i++)
{
restore_descr->orig_pk_attnum[i] = indexStruct->indkey.values[i];
}
ReleaseSysCache(indexTuple);
}
/*
* Okay, we're done. Cleanup and exit.
*/
#if PG_VERSION_NUM >= 120000
table_close(origRel, AccessShareLock);
#else
heap_close(origRel, AccessShareLock);
#endif
}
static void setTableLogRestoreDescr(TableLogRestoreDescr *restore_descr,
char *table_orig,
char *table_orig_pkey,
char *table_log,
char *table_log_pkey,
char *table_restore)
{
List *logIdentList;
List *restoreIdentList;
int i;
Assert(restore_descr != NULL);
/*
* Setup some stuff...
*/
restore_descr->orig_num_pk_attnums = 0;
restore_descr->orig_pk_attr_names = NIL;
restore_descr->orig_pk_attnum = NULL;
restore_descr->orig_relname = pstrdup(table_orig);
/*
* Keep gcc quiet.
* In table_log_restore_table() we call RESTORE_TABLE_IDENT,
* which lets gcc guess that we might get into trouble if
* the restore descriptor was not fully initialized.*
*
* However, we already make sure that RESTORE_TABLE_IDENT
* won't be called with ident_[restore|log].relname unless
* use_schema_log or use_schema_restore is set to false.
*/