* Portions Copyright (c) 1994-5, Regents of the University of California
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/backend/commands/explain.c,v 1.186 2009/06/11 14:48:55 momjian Exp $
+ * $PostgreSQL: pgsql/src/backend/commands/explain.c,v 1.187 2009/07/24 21:08:42 tgl Exp $
*
*-------------------------------------------------------------------------
*/
typedef struct ExplainState
{
+ StringInfo str; /* output buffer */
/* options */
bool printTList; /* print plan targetlists */
bool printAnalyze; /* print actual times */
static void report_triggers(ResultRelInfo *rInfo, bool show_relname,
StringInfo buf);
static double elapsed_time(instr_time *starttime);
-static void explain_outNode(StringInfo str,
- Plan *plan, PlanState *planstate,
- Plan *outer_plan,
- int indent, ExplainState *es);
-static void show_plan_tlist(Plan *plan,
- StringInfo str, int indent, ExplainState *es);
+static void ExplainNode(Plan *plan, PlanState *planstate,
+ Plan *outer_plan, int indent, ExplainState *es);
+static void show_plan_tlist(Plan *plan, int indent, ExplainState *es);
+static void show_qual(List *qual, const char *qlabel, Plan *plan,
+ Plan *outer_plan, int indent, bool useprefix, ExplainState *es);
static void show_scan_qual(List *qual, const char *qlabel,
- int scanrelid, Plan *scan_plan, Plan *outer_plan,
- StringInfo str, int indent, ExplainState *es);
+ Plan *scan_plan, Plan *outer_plan,
+ int indent, ExplainState *es);
static void show_upper_qual(List *qual, const char *qlabel, Plan *plan,
- StringInfo str, int indent, ExplainState *es);
-static void show_sort_keys(Plan *sortplan, int nkeys, AttrNumber *keycols,
- const char *qlabel,
- StringInfo str, int indent, ExplainState *es);
-static void show_sort_info(SortState *sortstate,
- StringInfo str, int indent, ExplainState *es);
+ int indent, ExplainState *es);
+static void show_sort_keys(Plan *sortplan, int indent, ExplainState *es);
+static void show_sort_info(SortState *sortstate, int indent, ExplainState *es);
static const char *explain_get_index_name(Oid indexId);
+static void ExplainScanTarget(Scan *plan, ExplainState *es);
+static void ExplainMemberNodes(List *plans, PlanState **planstate,
+ Plan *outer_plan, int indent, ExplainState *es);
+static void ExplainSubPlans(List *plans, int indent, ExplainState *es);
/*
Assert(queryDesc->plannedstmt != NULL);
memset(&es, 0, sizeof(es));
+ es.str = str;
es.printTList = verbose;
es.printAnalyze = analyze;
es.pstmt = queryDesc->plannedstmt;
es.rtable = queryDesc->plannedstmt->rtable;
- explain_outNode(str,
- queryDesc->plannedstmt->planTree, queryDesc->planstate,
- NULL, 0, &es);
+ ExplainNode(queryDesc->plannedstmt->planTree, queryDesc->planstate,
+ NULL, 0, &es);
}
/*
}
/*
- * explain_outNode -
- * converts a Plan node into ascii string and appends it to 'str'
+ * ExplainNode -
+ * converts a Plan node into ascii string and appends it to es->str
*
* planstate points to the executor state node corresponding to the plan node.
* We need this to get at the instrumentation data (if any) as well as the
* outer_plan, if not null, references another plan node that is the outer
* side of a join with the current node. This is only interesting for
* deciphering runtime keys of an inner indexscan.
+ *
+ * If indent is positive, we indent the plan output accordingly and put "->"
+ * in front of it. This should only happen for child plan nodes.
*/
static void
-explain_outNode(StringInfo str,
- Plan *plan, PlanState *planstate,
- Plan *outer_plan,
- int indent, ExplainState *es)
+ExplainNode(Plan *plan, PlanState *planstate,
+ Plan *outer_plan,
+ int indent, ExplainState *es)
{
const char *pname;
- int i;
+
+ if (indent)
+ {
+ Assert(indent >= 2);
+ appendStringInfoSpaces(es->str, 2 * indent - 4);
+ appendStringInfoString(es->str, "-> ");
+ }
if (plan == NULL)
{
- appendStringInfoChar(str, '\n');
+ appendStringInfoChar(es->str, '\n');
return;
}
break;
}
- appendStringInfoString(str, pname);
+ appendStringInfoString(es->str, pname);
switch (nodeTag(plan))
{
case T_IndexScan:
if (ScanDirectionIsBackward(((IndexScan *) plan)->indexorderdir))
- appendStringInfoString(str, " Backward");
- appendStringInfo(str, " using %s",
+ appendStringInfoString(es->str, " Backward");
+ appendStringInfo(es->str, " using %s",
explain_get_index_name(((IndexScan *) plan)->indexid));
/* FALL THRU */
case T_SeqScan:
case T_BitmapHeapScan:
case T_TidScan:
- if (((Scan *) plan)->scanrelid > 0)
- {
- RangeTblEntry *rte = rt_fetch(((Scan *) plan)->scanrelid,
- es->rtable);
- char *relname;
-
- /* Assume it's on a real relation */
- Assert(rte->rtekind == RTE_RELATION);
-
- /* We only show the rel name, not schema name */
- relname = get_rel_name(rte->relid);
-
- appendStringInfo(str, " on %s",
- quote_identifier(relname));
- if (strcmp(rte->eref->aliasname, relname) != 0)
- appendStringInfo(str, " %s",
- quote_identifier(rte->eref->aliasname));
- }
- break;
- case T_BitmapIndexScan:
- appendStringInfo(str, " on %s",
- explain_get_index_name(((BitmapIndexScan *) plan)->indexid));
- break;
case T_SubqueryScan:
- if (((Scan *) plan)->scanrelid > 0)
- {
- RangeTblEntry *rte = rt_fetch(((Scan *) plan)->scanrelid,
- es->rtable);
-
- appendStringInfo(str, " %s",
- quote_identifier(rte->eref->aliasname));
- }
- break;
case T_FunctionScan:
- if (((Scan *) plan)->scanrelid > 0)
- {
- RangeTblEntry *rte = rt_fetch(((Scan *) plan)->scanrelid,
- es->rtable);
- Node *funcexpr;
- char *proname;
-
- /* Assert it's on a RangeFunction */
- Assert(rte->rtekind == RTE_FUNCTION);
-
- /*
- * If the expression is still a function call, we can get the
- * real name of the function. Otherwise, punt (this can
- * happen if the optimizer simplified away the function call,
- * for example).
- */
- funcexpr = ((FunctionScan *) plan)->funcexpr;
- if (funcexpr && IsA(funcexpr, FuncExpr))
- {
- Oid funcid = ((FuncExpr *) funcexpr)->funcid;
-
- /* We only show the func name, not schema name */
- proname = get_func_name(funcid);
- }
- else
- proname = rte->eref->aliasname;
-
- appendStringInfo(str, " on %s",
- quote_identifier(proname));
- if (strcmp(rte->eref->aliasname, proname) != 0)
- appendStringInfo(str, " %s",
- quote_identifier(rte->eref->aliasname));
- }
- break;
case T_ValuesScan:
- if (((Scan *) plan)->scanrelid > 0)
- {
- RangeTblEntry *rte = rt_fetch(((Scan *) plan)->scanrelid,
- es->rtable);
- char *valsname;
-
- /* Assert it's on a values rte */
- Assert(rte->rtekind == RTE_VALUES);
-
- valsname = rte->eref->aliasname;
-
- appendStringInfo(str, " on %s",
- quote_identifier(valsname));
- }
- break;
case T_CteScan:
- if (((Scan *) plan)->scanrelid > 0)
- {
- RangeTblEntry *rte = rt_fetch(((Scan *) plan)->scanrelid,
- es->rtable);
-
- /* Assert it's on a non-self-reference CTE */
- Assert(rte->rtekind == RTE_CTE);
- Assert(!rte->self_reference);
-
- appendStringInfo(str, " on %s",
- quote_identifier(rte->ctename));
- if (strcmp(rte->eref->aliasname, rte->ctename) != 0)
- appendStringInfo(str, " %s",
- quote_identifier(rte->eref->aliasname));
- }
- break;
case T_WorkTableScan:
- if (((Scan *) plan)->scanrelid > 0)
- {
- RangeTblEntry *rte = rt_fetch(((Scan *) plan)->scanrelid,
- es->rtable);
-
- /* Assert it's on a self-reference CTE */
- Assert(rte->rtekind == RTE_CTE);
- Assert(rte->self_reference);
-
- appendStringInfo(str, " on %s",
- quote_identifier(rte->ctename));
- if (strcmp(rte->eref->aliasname, rte->ctename) != 0)
- appendStringInfo(str, " %s",
- quote_identifier(rte->eref->aliasname));
- }
+ ExplainScanTarget((Scan *) plan, es);
+ break;
+ case T_BitmapIndexScan:
+ appendStringInfo(es->str, " on %s",
+ explain_get_index_name(((BitmapIndexScan *) plan)->indexid));
break;
default:
break;
}
- appendStringInfo(str, " (cost=%.2f..%.2f rows=%.0f width=%d)",
+ appendStringInfo(es->str, " (cost=%.2f..%.2f rows=%.0f width=%d)",
plan->startup_cost, plan->total_cost,
plan->plan_rows, plan->plan_width);
{
double nloops = planstate->instrument->nloops;
- appendStringInfo(str, " (actual time=%.3f..%.3f rows=%.0f loops=%.0f)",
+ appendStringInfo(es->str,
+ " (actual time=%.3f..%.3f rows=%.0f loops=%.0f)",
1000.0 * planstate->instrument->startup / nloops,
1000.0 * planstate->instrument->total / nloops,
planstate->instrument->ntuples / nloops,
planstate->instrument->nloops);
}
else if (es->printAnalyze)
- appendStringInfo(str, " (never executed)");
- appendStringInfoChar(str, '\n');
+ appendStringInfoString(es->str, " (never executed)");
+ appendStringInfoChar(es->str, '\n');
/* target list */
if (es->printTList)
- show_plan_tlist(plan, str, indent, es);
+ show_plan_tlist(plan, indent, es);
/* quals, sort keys, etc */
switch (nodeTag(plan))
{
case T_IndexScan:
show_scan_qual(((IndexScan *) plan)->indexqualorig,
- "Index Cond",
- ((Scan *) plan)->scanrelid,
- plan, outer_plan,
- str, indent, es);
+ "Index Cond", plan, outer_plan, indent, es);
show_scan_qual(plan->qual,
- "Filter",
- ((Scan *) plan)->scanrelid,
- plan, outer_plan,
- str, indent, es);
+ "Filter", plan, outer_plan, indent, es);
break;
case T_BitmapIndexScan:
show_scan_qual(((BitmapIndexScan *) plan)->indexqualorig,
- "Index Cond",
- ((Scan *) plan)->scanrelid,
- plan, outer_plan,
- str, indent, es);
+ "Index Cond", plan, outer_plan, indent, es);
break;
case T_BitmapHeapScan:
- /* XXX do we want to show this in production? */
show_scan_qual(((BitmapHeapScan *) plan)->bitmapqualorig,
- "Recheck Cond",
- ((Scan *) plan)->scanrelid,
- plan, outer_plan,
- str, indent, es);
+ "Recheck Cond", plan, outer_plan, indent, es);
/* FALL THRU */
case T_SeqScan:
case T_FunctionScan:
case T_ValuesScan:
case T_CteScan:
case T_WorkTableScan:
- show_scan_qual(plan->qual,
- "Filter",
- ((Scan *) plan)->scanrelid,
- plan, outer_plan,
- str, indent, es);
- break;
case T_SubqueryScan:
show_scan_qual(plan->qual,
- "Filter",
- ((Scan *) plan)->scanrelid,
- plan, outer_plan,
- str, indent, es);
+ "Filter", plan, outer_plan, indent, es);
break;
case T_TidScan:
{
if (list_length(tidquals) > 1)
tidquals = list_make1(make_orclause(tidquals));
show_scan_qual(tidquals,
- "TID Cond",
- ((Scan *) plan)->scanrelid,
- plan, outer_plan,
- str, indent, es);
+ "TID Cond", plan, outer_plan, indent, es);
show_scan_qual(plan->qual,
- "Filter",
- ((Scan *) plan)->scanrelid,
- plan, outer_plan,
- str, indent, es);
+ "Filter", plan, outer_plan, indent, es);
}
break;
case T_NestLoop:
show_upper_qual(((NestLoop *) plan)->join.joinqual,
- "Join Filter", plan,
- str, indent, es);
- show_upper_qual(plan->qual,
- "Filter", plan,
- str, indent, es);
+ "Join Filter", plan, indent, es);
+ show_upper_qual(plan->qual, "Filter", plan, indent, es);
break;
case T_MergeJoin:
show_upper_qual(((MergeJoin *) plan)->mergeclauses,
- "Merge Cond", plan,
- str, indent, es);
+ "Merge Cond", plan, indent, es);
show_upper_qual(((MergeJoin *) plan)->join.joinqual,
- "Join Filter", plan,
- str, indent, es);
- show_upper_qual(plan->qual,
- "Filter", plan,
- str, indent, es);
+ "Join Filter", plan, indent, es);
+ show_upper_qual(plan->qual, "Filter", plan, indent, es);
break;
case T_HashJoin:
show_upper_qual(((HashJoin *) plan)->hashclauses,
- "Hash Cond", plan,
- str, indent, es);
+ "Hash Cond", plan, indent, es);
show_upper_qual(((HashJoin *) plan)->join.joinqual,
- "Join Filter", plan,
- str, indent, es);
- show_upper_qual(plan->qual,
- "Filter", plan,
- str, indent, es);
+ "Join Filter", plan, indent, es);
+ show_upper_qual(plan->qual, "Filter", plan, indent, es);
break;
case T_Agg:
case T_Group:
- show_upper_qual(plan->qual,
- "Filter", plan,
- str, indent, es);
+ show_upper_qual(plan->qual, "Filter", plan, indent, es);
break;
case T_Sort:
- show_sort_keys(plan,
- ((Sort *) plan)->numCols,
- ((Sort *) plan)->sortColIdx,
- "Sort Key",
- str, indent, es);
- show_sort_info((SortState *) planstate,
- str, indent, es);
+ show_sort_keys(plan, indent, es);
+ show_sort_info((SortState *) planstate, indent, es);
break;
case T_Result:
show_upper_qual((List *) ((Result *) plan)->resconstantqual,
- "One-Time Filter", plan,
- str, indent, es);
- show_upper_qual(plan->qual,
- "Filter", plan,
- str, indent, es);
+ "One-Time Filter", plan, indent, es);
+ show_upper_qual(plan->qual, "Filter", plan, indent, es);
break;
default:
break;
/* initPlan-s */
if (plan->initPlan)
- {
- ListCell *lst;
-
- foreach(lst, planstate->initPlan)
- {
- SubPlanState *sps = (SubPlanState *) lfirst(lst);
- SubPlan *sp = (SubPlan *) sps->xprstate.expr;
-
- for (i = 0; i < indent; i++)
- appendStringInfo(str, " ");
- appendStringInfo(str, " %s\n", sp->plan_name);
- for (i = 0; i < indent; i++)
- appendStringInfo(str, " ");
- appendStringInfo(str, " -> ");
- explain_outNode(str,
- exec_subplan_get_plan(es->pstmt, sp),
- sps->planstate,
- NULL,
- indent + 4, es);
- }
- }
+ ExplainSubPlans(planstate->initPlan, indent, es);
/* lefttree */
if (outerPlan(plan))
{
- for (i = 0; i < indent; i++)
- appendStringInfo(str, " ");
- appendStringInfo(str, " -> ");
-
/*
* Ordinarily we don't pass down our own outer_plan value to our child
* nodes, but in bitmap scan trees we must, since the bottom
* BitmapIndexScan nodes may have outer references.
*/
- explain_outNode(str, outerPlan(plan),
- outerPlanState(planstate),
- IsA(plan, BitmapHeapScan) ? outer_plan : NULL,
- indent + 3, es);
+ ExplainNode(outerPlan(plan), outerPlanState(planstate),
+ IsA(plan, BitmapHeapScan) ? outer_plan : NULL,
+ indent + 3, es);
}
/* righttree */
if (innerPlan(plan))
{
- for (i = 0; i < indent; i++)
- appendStringInfo(str, " ");
- appendStringInfo(str, " -> ");
- explain_outNode(str, innerPlan(plan),
- innerPlanState(planstate),
- outerPlan(plan),
- indent + 3, es);
- }
-
- if (IsA(plan, Append))
- {
- Append *appendplan = (Append *) plan;
- AppendState *appendstate = (AppendState *) planstate;
- ListCell *lst;
- int j;
-
- j = 0;
- foreach(lst, appendplan->appendplans)
- {
- Plan *subnode = (Plan *) lfirst(lst);
-
- for (i = 0; i < indent; i++)
- appendStringInfo(str, " ");
- appendStringInfo(str, " -> ");
-
- /*
- * Ordinarily we don't pass down our own outer_plan value to our
- * child nodes, but in an Append we must, since we might be
- * looking at an appendrel indexscan with outer references from
- * the member scans.
- */
- explain_outNode(str, subnode,
- appendstate->appendplans[j],
- outer_plan,
- indent + 3, es);
- j++;
- }
+ ExplainNode(innerPlan(plan), innerPlanState(planstate),
+ outerPlan(plan), indent + 3, es);
}
- if (IsA(plan, BitmapAnd))
- {
- BitmapAnd *bitmapandplan = (BitmapAnd *) plan;
- BitmapAndState *bitmapandstate = (BitmapAndState *) planstate;
- ListCell *lst;
- int j;
-
- j = 0;
- foreach(lst, bitmapandplan->bitmapplans)
- {
- Plan *subnode = (Plan *) lfirst(lst);
-
- for (i = 0; i < indent; i++)
- appendStringInfo(str, " ");
- appendStringInfo(str, " -> ");
-
- explain_outNode(str, subnode,
- bitmapandstate->bitmapplans[j],
- outer_plan, /* pass down same outer plan */
- indent + 3, es);
- j++;
- }
- }
-
- if (IsA(plan, BitmapOr))
+ /* special child plans */
+ switch (nodeTag(plan))
{
- BitmapOr *bitmaporplan = (BitmapOr *) plan;
- BitmapOrState *bitmaporstate = (BitmapOrState *) planstate;
- ListCell *lst;
- int j;
-
- j = 0;
- foreach(lst, bitmaporplan->bitmapplans)
- {
- Plan *subnode = (Plan *) lfirst(lst);
-
- for (i = 0; i < indent; i++)
- appendStringInfo(str, " ");
- appendStringInfo(str, " -> ");
-
- explain_outNode(str, subnode,
- bitmaporstate->bitmapplans[j],
- outer_plan, /* pass down same outer plan */
- indent + 3, es);
- j++;
- }
- }
+ case T_Append:
+ ExplainMemberNodes(((Append *) plan)->appendplans,
+ ((AppendState *) planstate)->appendplans,
+ outer_plan, indent, es);
+ break;
+ case T_BitmapAnd:
+ ExplainMemberNodes(((BitmapAnd *) plan)->bitmapplans,
+ ((BitmapAndState *) planstate)->bitmapplans,
+ outer_plan, indent, es);
+ break;
+ case T_BitmapOr:
+ ExplainMemberNodes(((BitmapOr *) plan)->bitmapplans,
+ ((BitmapOrState *) planstate)->bitmapplans,
+ outer_plan, indent, es);
+ break;
+ case T_SubqueryScan:
+ {
+ SubqueryScan *subqueryscan = (SubqueryScan *) plan;
+ SubqueryScanState *subquerystate = (SubqueryScanState *) planstate;
- if (IsA(plan, SubqueryScan))
- {
- SubqueryScan *subqueryscan = (SubqueryScan *) plan;
- SubqueryScanState *subquerystate = (SubqueryScanState *) planstate;
- Plan *subnode = subqueryscan->subplan;
-
- for (i = 0; i < indent; i++)
- appendStringInfo(str, " ");
- appendStringInfo(str, " -> ");
-
- explain_outNode(str, subnode,
- subquerystate->subplan,
- NULL,
- indent + 3, es);
+ ExplainNode(subqueryscan->subplan, subquerystate->subplan,
+ NULL, indent + 3, es);
+ }
+ break;
+ default:
+ break;
}
/* subPlan-s */
if (planstate->subPlan)
- {
- ListCell *lst;
-
- foreach(lst, planstate->subPlan)
- {
- SubPlanState *sps = (SubPlanState *) lfirst(lst);
- SubPlan *sp = (SubPlan *) sps->xprstate.expr;
-
- for (i = 0; i < indent; i++)
- appendStringInfo(str, " ");
- appendStringInfo(str, " %s\n", sp->plan_name);
- for (i = 0; i < indent; i++)
- appendStringInfo(str, " ");
- appendStringInfo(str, " -> ");
- explain_outNode(str,
- exec_subplan_get_plan(es->pstmt, sp),
- sps->planstate,
- NULL,
- indent + 4, es);
- }
- }
+ ExplainSubPlans(planstate->subPlan, indent, es);
}
/*
* Show the targetlist of a plan node
*/
static void
-show_plan_tlist(Plan *plan,
- StringInfo str, int indent, ExplainState *es)
+show_plan_tlist(Plan *plan, int indent, ExplainState *es)
{
List *context;
bool useprefix;
useprefix = list_length(es->rtable) > 1;
/* Emit line prefix */
- for (i = 0; i < indent; i++)
- appendStringInfo(str, " ");
- appendStringInfo(str, " Output: ");
+ appendStringInfoSpaces(es->str, indent * 2);
+ appendStringInfoString(es->str, " Output: ");
/* Deparse each non-junk result column */
i = 0;
if (tle->resjunk)
continue;
if (i++ > 0)
- appendStringInfo(str, ", ");
- appendStringInfoString(str,
+ appendStringInfoString(es->str, ", ");
+ appendStringInfoString(es->str,
deparse_expression((Node *) tle->expr, context,
useprefix, false));
}
- appendStringInfoChar(str, '\n');
+ appendStringInfoChar(es->str, '\n');
}
/*
- * Show a qualifier expression for a scan plan node
+ * Show a qualifier expression
*
* Note: outer_plan is the referent for any OUTER vars in the scan qual;
* this would be the outer side of a nestloop plan. Pass NULL if none.
*/
static void
-show_scan_qual(List *qual, const char *qlabel,
- int scanrelid, Plan *scan_plan, Plan *outer_plan,
- StringInfo str, int indent, ExplainState *es)
+show_qual(List *qual, const char *qlabel, Plan *plan, Plan *outer_plan,
+ int indent, bool useprefix, ExplainState *es)
{
List *context;
- bool useprefix;
Node *node;
char *exprstr;
- int i;
/* No work if empty qual */
if (qual == NIL)
node = (Node *) make_ands_explicit(qual);
/* Set up deparsing context */
- context = deparse_context_for_plan((Node *) scan_plan,
+ context = deparse_context_for_plan((Node *) plan,
(Node *) outer_plan,
es->rtable,
es->pstmt->subplans);
- useprefix = (outer_plan != NULL || IsA(scan_plan, SubqueryScan));
/* Deparse the expression */
exprstr = deparse_expression(node, context, useprefix, false);
- /* And add to str */
- for (i = 0; i < indent; i++)
- appendStringInfo(str, " ");
- appendStringInfo(str, " %s: %s\n", qlabel, exprstr);
+ /* And add to es->str */
+ appendStringInfoSpaces(es->str, indent * 2);
+ appendStringInfo(es->str, " %s: %s\n", qlabel, exprstr);
}
/*
- * Show a qualifier expression for an upper-level plan node
+ * Show a qualifier expression for a scan plan node
*/
static void
-show_upper_qual(List *qual, const char *qlabel, Plan *plan,
- StringInfo str, int indent, ExplainState *es)
+show_scan_qual(List *qual, const char *qlabel,
+ Plan *scan_plan, Plan *outer_plan,
+ int indent, ExplainState *es)
{
- List *context;
bool useprefix;
- Node *node;
- char *exprstr;
- int i;
-
- /* No work if empty qual */
- if (qual == NIL)
- return;
- /* Set up deparsing context */
- context = deparse_context_for_plan((Node *) plan,
- NULL,
- es->rtable,
- es->pstmt->subplans);
- useprefix = list_length(es->rtable) > 1;
+ useprefix = (outer_plan != NULL || IsA(scan_plan, SubqueryScan));
+ show_qual(qual, qlabel, scan_plan, outer_plan, indent, useprefix, es);
+}
- /* Deparse the expression */
- node = (Node *) make_ands_explicit(qual);
- exprstr = deparse_expression(node, context, useprefix, false);
+/*
+ * Show a qualifier expression for an upper-level plan node
+ */
+static void
+show_upper_qual(List *qual, const char *qlabel, Plan *plan,
+ int indent, ExplainState *es)
+{
+ bool useprefix;
- /* And add to str */
- for (i = 0; i < indent; i++)
- appendStringInfo(str, " ");
- appendStringInfo(str, " %s: %s\n", qlabel, exprstr);
+ useprefix = (list_length(es->rtable) > 1);
+ show_qual(qual, qlabel, plan, NULL, indent, useprefix, es);
}
/*
* Show the sort keys for a Sort node.
*/
static void
-show_sort_keys(Plan *sortplan, int nkeys, AttrNumber *keycols,
- const char *qlabel,
- StringInfo str, int indent, ExplainState *es)
+show_sort_keys(Plan *sortplan, int indent, ExplainState *es)
{
+ int nkeys = ((Sort *) sortplan)->numCols;
+ AttrNumber *keycols = ((Sort *) sortplan)->sortColIdx;
List *context;
bool useprefix;
int keyno;
char *exprstr;
- int i;
if (nkeys <= 0)
return;
- for (i = 0; i < indent; i++)
- appendStringInfo(str, " ");
- appendStringInfo(str, " %s: ", qlabel);
+ appendStringInfoSpaces(es->str, indent * 2);
+ appendStringInfoString(es->str, " Sort Key: ");
/* Set up deparsing context */
context = deparse_context_for_plan((Node *) sortplan,
/* Deparse the expression, showing any top-level cast */
exprstr = deparse_expression((Node *) target->expr, context,
useprefix, true);
- /* And add to str */
+ /* And add to es->str */
if (keyno > 0)
- appendStringInfo(str, ", ");
- appendStringInfoString(str, exprstr);
+ appendStringInfoString(es->str, ", ");
+ appendStringInfoString(es->str, exprstr);
}
- appendStringInfo(str, "\n");
+ appendStringInfoChar(es->str, '\n');
}
/*
* If it's EXPLAIN ANALYZE, show tuplesort explain info for a sort node
*/
static void
-show_sort_info(SortState *sortstate,
- StringInfo str, int indent, ExplainState *es)
+show_sort_info(SortState *sortstate, int indent, ExplainState *es)
{
Assert(IsA(sortstate, SortState));
if (es->printAnalyze && sortstate->sort_Done &&
sortstate->tuplesortstate != NULL)
{
char *sortinfo;
- int i;
sortinfo = tuplesort_explain((Tuplesortstate *) sortstate->tuplesortstate);
- for (i = 0; i < indent; i++)
- appendStringInfo(str, " ");
- appendStringInfo(str, " %s\n", sortinfo);
+ appendStringInfoSpaces(es->str, indent * 2);
+ appendStringInfo(es->str, " %s\n", sortinfo);
pfree(sortinfo);
}
}
}
return result;
}
+
+/*
+ * Show the target of a Scan node
+ */
+static void
+ExplainScanTarget(Scan *plan, ExplainState *es)
+{
+ char *objectname = NULL;
+ RangeTblEntry *rte;
+
+ if (plan->scanrelid <= 0) /* Is this still possible? */
+ return;
+ rte = rt_fetch(plan->scanrelid, es->rtable);
+
+ switch (nodeTag(plan))
+ {
+ case T_SeqScan:
+ case T_IndexScan:
+ case T_BitmapHeapScan:
+ case T_TidScan:
+ /* Assert it's on a real relation */
+ Assert(rte->rtekind == RTE_RELATION);
+ objectname = get_rel_name(rte->relid);
+ break;
+ case T_FunctionScan:
+ {
+ Node *funcexpr;
+
+ /* Assert it's on a RangeFunction */
+ Assert(rte->rtekind == RTE_FUNCTION);
+
+ /*
+ * If the expression is still a function call, we can get the
+ * real name of the function. Otherwise, punt (this can
+ * happen if the optimizer simplified away the function call,
+ * for example).
+ */
+ funcexpr = ((FunctionScan *) plan)->funcexpr;
+ if (funcexpr && IsA(funcexpr, FuncExpr))
+ {
+ Oid funcid = ((FuncExpr *) funcexpr)->funcid;
+
+ objectname = get_func_name(funcid);
+ }
+ }
+ break;
+ case T_ValuesScan:
+ Assert(rte->rtekind == RTE_VALUES);
+ break;
+ case T_CteScan:
+ /* Assert it's on a non-self-reference CTE */
+ Assert(rte->rtekind == RTE_CTE);
+ Assert(!rte->self_reference);
+ objectname = rte->ctename;
+ break;
+ case T_WorkTableScan:
+ /* Assert it's on a self-reference CTE */
+ Assert(rte->rtekind == RTE_CTE);
+ Assert(rte->self_reference);
+ objectname = rte->ctename;
+ break;
+ default:
+ break;
+ }
+
+ appendStringInfoString(es->str, " on");
+ if (objectname != NULL)
+ appendStringInfo(es->str, " %s", quote_identifier(objectname));
+ if (objectname == NULL || strcmp(rte->eref->aliasname, objectname) != 0)
+ appendStringInfo(es->str, " %s",
+ quote_identifier(rte->eref->aliasname));
+}
+
+/*
+ * Explain the constituent plans of an Append, BitmapAnd, or BitmapOr node.
+ *
+ * Ordinarily we don't pass down outer_plan to our child nodes, but in these
+ * cases we must, since the node could be an "inner indexscan" in which case
+ * outer references can appear in the child nodes.
+ */
+static void
+ExplainMemberNodes(List *plans, PlanState **planstate, Plan *outer_plan,
+ int indent, ExplainState *es)
+{
+ ListCell *lst;
+ int j = 0;
+
+ foreach(lst, plans)
+ {
+ Plan *subnode = (Plan *) lfirst(lst);
+
+ ExplainNode(subnode, planstate[j],
+ outer_plan, indent + 3, es);
+ j++;
+ }
+}
+
+/*
+ * Explain a list of SubPlans (or initPlans, which also use SubPlan nodes).
+ */
+static void
+ExplainSubPlans(List *plans, int indent, ExplainState *es)
+{
+ ListCell *lst;
+
+ foreach(lst, plans)
+ {
+ SubPlanState *sps = (SubPlanState *) lfirst(lst);
+ SubPlan *sp = (SubPlan *) sps->xprstate.expr;
+
+ appendStringInfoSpaces(es->str, indent * 2);
+ appendStringInfo(es->str, " %s\n", sp->plan_name);
+ ExplainNode(exec_subplan_get_plan(es->pstmt, sp),
+ sps->planstate, NULL, indent + 4, es);
+ }
+}
projects / postgresql / commitdiff