pg_overexplain: Call previous hooks as appropriate.

It makes no sense to remember the previous values of the hook variables
and then never bother calling those functions. Thanks to Andrei for
spotting my goof.

Author: Andrei Lepikhov 
Discussion: http://postgr.es/m/41a344e3-ffb1-4296-8ba7-801f1e9642e5@gmail.com

diff --git a/contrib/pg_overexplain/pg_overexplain.c b/contrib/pg_overexplain/pg_overexplain.c
index 4554c3abbbfbdb0257b2d04bbb40a6250e69e050..5f623e06019343f85d51fa2f620ad5c5a922d139 100644 (file)
--- a/contrib/pg_overexplain/pg_overexplain.c
+++ b/contrib/pg_overexplain/pg_overexplain.c
@@ -135,6 +135,10 @@ overexplain_per_node_hook(PlanState *planstate, List *ancestors,
    overexplain_options *options;
    Plan       *plan = planstate->plan;
 
+   if (prev_explain_per_node_hook)
+       (*prev_explain_per_node_hook) (planstate, ancestors, relationship,
+                                      plan_name, es);
+
    options = GetExplainExtensionState(es, es_extension_id);
    if (options == NULL)
        return;
@@ -251,6 +255,10 @@ overexplain_per_plan_hook(PlannedStmt *plannedstmt,
 {
    overexplain_options *options;
 
+   if (prev_explain_per_plan_hook)
+       (*prev_explain_per_plan_hook) (plannedstmt, into, es, queryString,
+                                      params, queryEnv);
+
    options = GetExplainExtensionState(es, es_extension_id);
    if (options == NULL)
        return;