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Use the index to get the query's configuration #29

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Use the index to get the query's configuration #29

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35 changes: 31 additions & 4 deletions pg_query_settings.c
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Original file line number Diff line number Diff line change
Expand Up @@ -23,6 +23,8 @@
#include <utils/builtins.h>
#include <utils/guc.h>
#include <lib/ilist.h>
#include <access/genam.h>
#include <utils/fmgroids.h>

/* This is a module :) */

Expand Down Expand Up @@ -150,7 +152,7 @@ execPlantuner(Query *parse, const char *query_st, int cursorOptions, ParamListIn
Relation config_rel;
HeapTuple config_tuple;
Oid config_relid;
TableScanDesc config_scan;
SysScanDesc scandesc;
Datum data;
bool isnull;
bool rethrow = false;
Expand All @@ -159,6 +161,11 @@ execPlantuner(Query *parse, const char *query_st, int cursorOptions, ParamListIn
char *guc_name = NULL;
parameter *param = NULL;
uint64 queryid = 0;
ScanKeyData entry[1];
List *pgqs_index_list = NULL;
Oid pgqs_first_indexOid = 0;
ListCell *pgqs_first_index = NULL;


if (enabled)
{
Expand Down Expand Up @@ -187,9 +194,29 @@ execPlantuner(Query *parse, const char *query_st, int cursorOptions, ParamListIn

config_rel = table_open(config_relid, AccessShareLock);

config_scan = table_beginscan(config_rel, GetActiveSnapshot(), 0, NULL);
// Get the indexes list of our relation
pgqs_index_list = RelationGetIndexList(config_rel);
if (!pgqs_index_list)
{
elog(ERROR, "cannot find an index on table \"%s\"", pgqs_config);
}

// Get the first and /should be/ last index of our relation
pgqs_first_index = list_head(pgqs_index_list);
pgqs_first_indexOid = lfirst_oid(pgqs_first_index);

// we dont need this list anymore
pfree(pgqs_index_list);

if (!OidIsValid(pgqs_first_indexOid))
{
elog(ERROR, "index OID %d is not valid", pgqs_first_indexOid);
}

ScanKeyInit(&entry[0], 1, BTEqualStrategyNumber, F_INT8EQ, Int64GetDatum(queryid));
scandesc = systable_beginscan(config_rel, pgqs_first_indexOid, true, NULL, 1, entry);

while ((config_tuple = heap_getnext(config_scan, ForwardScanDirection)) != NULL)
while ((config_tuple = systable_getnext(scandesc)) != NULL)
{
/* Get the queryid in the currently read tuple. */
data = heap_getattr(config_tuple, 1, config_rel->rd_att, &isnull);
Expand Down Expand Up @@ -247,7 +274,7 @@ execPlantuner(Query *parse, const char *query_st, int cursorOptions, ParamListIn
}

close:
table_endscan(config_scan);
systable_endscan(scandesc);
table_close(config_rel, AccessShareLock);
if (rethrow)
{
Expand Down