outfuncs.c

/*
 *
 * outfuncs.c
 *	  routines to convert a node to ascii representation
 *
 * Copyright (c) 1994, Regents of the University of California
 *
 *	$Id: outfuncs.c,v 1.88 1999/07/16 04:59:05 momjian Exp $
 *
 * NOTES
 *	  Every (plan) node in POSTGRES has an associated "out" routine which
 *	  knows how to create its ascii representation. These functions are
 *	  useful for debugging as well as for storing plans in the system
 *	  catalogs (eg. indexes). This is also the plan string sent out in
 *	  Mariposa.
 *
 *	  These functions update the in/out argument of type StringInfo
 *	  passed to them. This argument contains the string holding the ASCII
 *	  representation plus some other information (string length, etc.)
 *
 */
#include <stdio.h>
#include "postgres.h"

#include "access/heapam.h"
#include "access/htup.h"
#include "catalog/pg_type.h"
#include "fmgr.h"
#include "lib/stringinfo.h"
#include "nodes/execnodes.h"
#include "nodes/nodes.h"
#include "nodes/parsenodes.h"
#include "nodes/pg_list.h"
#include "nodes/plannodes.h"
#include "nodes/primnodes.h"
#include "nodes/relation.h"
#include "utils/datum.h"
#include "utils/lsyscache.h"
#include "utils/syscache.h"

#include "../parse.h"

static void _outDatum(StringInfo str, Datum value, Oid type);
static void _outNode(StringInfo str, void *obj);

/*
 * _outIntList -
 *	   converts a List of integers
 */
static void
_outIntList(StringInfo str, List *list)
{
	List	   *l;

	appendStringInfo(str, "(");
	foreach(l, list)
		appendStringInfo(str, " %d ", lfirsti(l));
	appendStringInfo(str, ")");
}

static void
_outCreateStmt(StringInfo str, CreateStmt *node)
{
	appendStringInfo(str, " CREATE :relname %s ",
					 stringStringInfo(node->relname));

	appendStringInfo(str, " :istemp %s ",
					 node->istemp ? "true" : "false");

	appendStringInfo(str, "	:columns ");
	_outNode(str, node->tableElts);

	appendStringInfo(str, " :inhRelnames ");
	_outNode(str, node->inhRelnames);

	appendStringInfo(str, " :constraints ");
	_outNode(str, node->constraints);
}

static void
_outIndexStmt(StringInfo str, IndexStmt *node)
{
	appendStringInfo(str,
		 " INDEX :idxname %s :relname %s :accessMethod %s :indexParams ",
					 stringStringInfo(node->idxname),
					 stringStringInfo(node->relname),
					 stringStringInfo(node->accessMethod));
	_outNode(str, node->indexParams);

	appendStringInfo(str, " :withClause ");
	_outNode(str, node->withClause);

	appendStringInfo(str, " :whereClause ");
	_outNode(str, node->whereClause);

	appendStringInfo(str, " :rangetable ");
	_outNode(str, node->rangetable);

	appendStringInfo(str, " :lossy %s :unique %s ",
					 node->lossy ? "true" : "false",
					 node->unique ? "true" : "false");
}

static void
_outSelectStmt(StringInfo str, SelectStmt *node)
{
	appendStringInfo(str, "SELECT :where ");
	_outNode(str, node->whereClause);
}

static void
_outFuncCall(StringInfo str, FuncCall *node)
{
	appendStringInfo(str, "FUNCTION %s :args ", stringStringInfo(node->funcname));
	_outNode(str, node->args);
}

static void
_outColumnDef(StringInfo str, ColumnDef *node)
{
	appendStringInfo(str, " COLUMNDEF :colname %s :typename ",
					 stringStringInfo(node->colname));
	_outNode(str, node->typename);

	appendStringInfo(str, " :is_not_null %s :defval %s :constraints ",
					 node->is_not_null ? "true" : "false",
					 stringStringInfo(node->defval));
	_outNode(str, node->constraints);
}

static void
_outTypeName(StringInfo str, TypeName *node)
{
	appendStringInfo(str,
	 " TYPENAME :name %s :timezone %s :setof %s typmod %d :arrayBounds ",
					 stringStringInfo(node->name),
					 node->timezone ? "true" : "false",
					 node->setof ? "true" : "false",
					 node->typmod);

	appendStringInfo(str, " :arrayBounds ");
	_outNode(str, node->arrayBounds);
}

static void
_outIndexElem(StringInfo str, IndexElem *node)
{
	appendStringInfo(str, " INDEXELEM :name %s :args ",
					 stringStringInfo(node->name));
	_outNode(str, node->args);

	appendStringInfo(str, " :class %s :typename ", stringStringInfo(node->class));
	_outNode(str, node->typename);
}

static void
_outQuery(StringInfo str, Query *node)
{

	appendStringInfo(str, " QUERY :command %d ", node->commandType);

	if (node->utilityStmt)
	{
		switch (nodeTag(node->utilityStmt))
		{
			case T_CreateStmt:
				appendStringInfo(str, " :create %s ",
								 stringStringInfo(((CreateStmt *) (node->utilityStmt))->relname));
				_outNode(str, node->utilityStmt);
				break;

			case T_IndexStmt:
				appendStringInfo(str, " :index %s on %s ",
								 stringStringInfo(((IndexStmt *) (node->utilityStmt))->idxname),
								 stringStringInfo(((IndexStmt *) (node->utilityStmt))->relname));
				_outNode(str, node->utilityStmt);
				break;

			case T_NotifyStmt:
				appendStringInfo(str, " :utility %s ",
								 stringStringInfo(((NotifyStmt *) (node->utilityStmt))->relname));
				break;

			default:
				appendStringInfo(str, " :utility ? ");
		}
	}
	else
		appendStringInfo(str, " :utility <>");

	appendStringInfo(str,
					 " :resultRelation %u :into %s :isPortal %s :isBinary %s :isTemp %s :unionall %s ",
					 node->resultRelation,
					 stringStringInfo(node->into),
					 node->isPortal ? "true" : "false",
					 node->isBinary ? "true" : "false",
					 node->isTemp ? "true" : "false",
					 node->unionall ? "true" : "false");

	appendStringInfo(str, " :unique %s :sortClause ",
					 stringStringInfo(node->uniqueFlag));
	_outNode(str, node->sortClause);

	appendStringInfo(str, " :rtable ");
	_outNode(str, node->rtable);

	appendStringInfo(str, " :targetlist ");
	_outNode(str, node->targetList);

	appendStringInfo(str, " :qual ");
	_outNode(str, node->qual);

	appendStringInfo(str, " :groupClause ");
	_outNode(str, node->groupClause);

	appendStringInfo(str, " :havingQual ");
	_outNode(str, node->havingQual);

	appendStringInfo(str, " :hasAggs %s :hasSubLinks %s :unionClause ",
					 node->hasAggs ? "true" : "false",
					 node->hasSubLinks ? "true" : "false");
	_outNode(str, node->unionClause);

	appendStringInfo(str, " :intersectClause ");
	_outNode(str, node->intersectClause);

	appendStringInfo(str, " :limitOffset ");
	_outNode(str, node->limitOffset);

	appendStringInfo(str, " :limitCount ");
	_outNode(str, node->limitCount);

	appendStringInfo(str, " :rowMark ");
	_outNode(str, node->rowMark);

}

static void
_outSortClause(StringInfo str, SortClause *node)
{
	appendStringInfo(str, " SORTCLAUSE :resdom ");
	_outNode(str, node->resdom);

	appendStringInfo(str, " :opoid %u ", node->opoid);
}

static void
_outGroupClause(StringInfo str, GroupClause *node)
{
	appendStringInfo(str, " GROUPCLAUSE :grpOpoid %u :tleGroupref %d",
					 node->grpOpoid,
					 node->tleGroupref);
}

/*
 * print the basic stuff of all nodes that inherit from Plan
 */
static void
_outPlanInfo(StringInfo str, Plan *node)
{
	appendStringInfo(str,
				  ":cost %g :size %d :width %d :state %s :qptargetlist ",
					 node->cost,
					 node->plan_size,
					 node->plan_width,
					 node->state ? "not-NULL" : "<>");
	_outNode(str, node->targetlist);

	appendStringInfo(str, " :qpqual ");
	_outNode(str, node->qual);

	appendStringInfo(str, " :lefttree ");
	_outNode(str, node->lefttree);

	appendStringInfo(str, " :righttree ");
	_outNode(str, node->righttree);

	appendStringInfo(str, " :extprm ");
	_outIntList(str, node->extParam);

	appendStringInfo(str, " :locprm ");
	_outIntList(str, node->locParam);

	appendStringInfo(str, " :initplan ");
	_outNode(str, node->initPlan);

	appendStringInfo(str, " :nprm %d ", node->nParamExec);
}

/*
 *	Stuff from plannodes.h
 */
static void
_outPlan(StringInfo str, Plan *node)
{
	appendStringInfo(str, " PLAN ");
	_outPlanInfo(str, (Plan *) node);
}

static void
_outResult(StringInfo str, Result *node)
{
	appendStringInfo(str, " RESULT ");
	_outPlanInfo(str, (Plan *) node);

	appendStringInfo(str, " :resconstantqual ");
	_outNode(str, node->resconstantqual);

}

/*
 *	Append is a subclass of Plan.
 */
static void
_outAppend(StringInfo str, Append *node)
{
	appendStringInfo(str, " APPEND ");
	_outPlanInfo(str, (Plan *) node);

	appendStringInfo(str, " :appendplans ");
	_outNode(str, node->appendplans);

	appendStringInfo(str, " :unionrtables ");
	_outNode(str, node->unionrtables);

	appendStringInfo(str,
					 " :inheritrelid %u :inheritrtable ",
					 node->inheritrelid);
	_outNode(str, node->inheritrtable);

}

/*
 *	Join is a subclass of Plan
 */
static void
_outJoin(StringInfo str, Join *node)
{
	appendStringInfo(str, " JOIN ");
	_outPlanInfo(str, (Plan *) node);

}

/*
 *	NestLoop is a subclass of Join
 */
static void
_outNestLoop(StringInfo str, NestLoop *node)
{
	appendStringInfo(str, " NESTLOOP ");
	_outPlanInfo(str, (Plan *) node);
}

/*
 *	MergeJoin is a subclass of Join
 */
static void
_outMergeJoin(StringInfo str, MergeJoin *node)
{
	appendStringInfo(str, " MERGEJOIN ");
	_outPlanInfo(str, (Plan *) node);

	appendStringInfo(str, " :mergeclauses ");
	_outNode(str, node->mergeclauses);
}

/*
 *	HashJoin is a subclass of Join.
 */
static void
_outHashJoin(StringInfo str, HashJoin *node)
{
	appendStringInfo(str, " HASHJOIN ");
	_outPlanInfo(str, (Plan *) node);

	appendStringInfo(str, " :hashclauses ");
	_outNode(str, node->hashclauses);

	appendStringInfo(str,
					 " :hashjoinop %u ",
					 node->hashjoinop);

	appendStringInfo(str,
					 " :hashdone %d ",
					 node->hashdone);
}

static void
_outSubPlan(StringInfo str, SubPlan *node)
{
	appendStringInfo(str, " SUBPLAN :plan ");
	_outNode(str, node->plan);

	appendStringInfo(str, " :planid %u :rtable ", node->plan_id);
	_outNode(str, node->rtable);

	appendStringInfo(str, " :setprm ");
	_outIntList(str, node->setParam);

	appendStringInfo(str, " :parprm ");
	_outIntList(str, node->parParam);

	appendStringInfo(str, " :slink ");
	_outNode(str, node->sublink);
}

/*
 *	Scan is a subclass of Node
 */
static void
_outScan(StringInfo str, Scan *node)
{
	appendStringInfo(str, " SCAN ");
	_outPlanInfo(str, (Plan *) node);

	appendStringInfo(str, " :scanrelid %u ", node->scanrelid);
}

/*
 *	SeqScan is a subclass of Scan
 */
static void
_outSeqScan(StringInfo str, SeqScan *node)
{
	appendStringInfo(str, " SEQSCAN ");
	_outPlanInfo(str, (Plan *) node);

	appendStringInfo(str, " :scanrelid %u ", node->scanrelid);
}

/*
 *	IndexScan is a subclass of Scan
 */
static void
_outIndexScan(StringInfo str, IndexScan *node)
{
	appendStringInfo(str, " INDEXSCAN ");
	_outPlanInfo(str, (Plan *) node);

	appendStringInfo(str, " :scanrelid %u :indxid ", node->scan.scanrelid);
	_outIntList(str, node->indxid);

	appendStringInfo(str, " :indxqual ");
	_outNode(str, node->indxqual);

	appendStringInfo(str, " :indxqualorig ");
	_outNode(str, node->indxqualorig);

}

/*
 *	Noname is a subclass of Plan
 */
static void
_outNoname(StringInfo str, Noname *node)
{
	appendStringInfo(str, " NONAME ");
	_outPlanInfo(str, (Plan *) node);

	appendStringInfo(str, " :nonameid %u :keycount %d ",
					 node->nonameid,
					 node->keycount);
}

/*
 *	Sort is a subclass of Noname
 */
static void
_outSort(StringInfo str, Sort *node)
{
	appendStringInfo(str, " SORT ");
	_outPlanInfo(str, (Plan *) node);

	appendStringInfo(str, " :nonameid %u :keycount %d ",
					 node->nonameid,
					 node->keycount);
}

static void
_outAgg(StringInfo str, Agg *node)
{

	appendStringInfo(str, " AGG ");
	_outPlanInfo(str, (Plan *) node);

	appendStringInfo(str, " :aggs ");
	_outNode(str, node->aggs);
}

static void
_outGroup(StringInfo str, Group *node)
{
	appendStringInfo(str, " GRP ");
	_outPlanInfo(str, (Plan *) node);

	/* the actual Group fields */
	appendStringInfo(str, " :numCols %d :tuplePerGroup %s ",
					 node->numCols,
					 node->tuplePerGroup ? "true" : "false");
}

/*
 *	For some reason, unique is a subclass of Noname.
 */
static void
_outUnique(StringInfo str, Unique *node)
{
	appendStringInfo(str, " UNIQUE ");
	_outPlanInfo(str, (Plan *) node);

	appendStringInfo(str, " :nonameid %u :keycount %d ",
					 node->nonameid,
					 node->keycount);
}


/*
 *	Hash is a subclass of Noname
 */
static void
_outHash(StringInfo str, Hash *node)
{
	appendStringInfo(str, " HASH ");
	_outPlanInfo(str, (Plan *) node);

	appendStringInfo(str, " :hashkey ");
	_outNode(str, node->hashkey);
}

/*****************************************************************************
 *
 *	Stuff from primnodes.h.
 *
 *****************************************************************************/

/*
 *	Resdom is a subclass of Node
 */
static void
_outResdom(StringInfo str, Resdom *node)
{
	appendStringInfo(str, " RESDOM :resno %d :restype %u :restypmod %d",
					 node->resno,
					 node->restype,
					 node->restypmod);

	appendStringInfo(str, " :resname \"%s\" :reskey %d :reskeyop %u",
					 stringStringInfo(node->resname),
					 node->reskey,
					 node->reskeyop);

	appendStringInfo(str, " :resgroupref %d :resjunk %s ",
					 node->resgroupref,
					 node->resjunk ? "true" : "false");
}

static void
_outFjoin(StringInfo str, Fjoin *node)
{
	int			i;

	appendStringInfo(str, " FJOIN :initialized %s :nNodes %d ",
					 node->fj_initialized ? "true" : "false",
					 node->fj_nNodes);

	appendStringInfo(str, " :innerNode ");
	_outNode(str, node->fj_innerNode);

	appendStringInfo(str, " :results @ 0x%x :alwaysdone",
					 (int) node->fj_results);

	for (i = 0; i < node->fj_nNodes; i++)
		appendStringInfo(str, (node->fj_alwaysDone[i]) ? "true" : "false");
}

/*
 *	Expr is a subclass of Node
 */
static void
_outExpr(StringInfo str, Expr *node)
{
	char	   *opstr = NULL;

	appendStringInfo(str, " EXPR :typeOid %u ",
					 node->typeOid);

	switch (node->opType)
	{
		case OP_EXPR:
			opstr = "op";
			break;
		case FUNC_EXPR:
			opstr = "func";
			break;
		case OR_EXPR:
			opstr = "or";
			break;
		case AND_EXPR:
			opstr = "and";
			break;
		case NOT_EXPR:
			opstr = "not";
			break;
		case SUBPLAN_EXPR:
			opstr = "subp";
			break;
	}
	appendStringInfo(str, " :opType %s :oper ", stringStringInfo(opstr));
	_outNode(str, node->oper);

	appendStringInfo(str, " :args ");
	_outNode(str, node->args);
}

/*
 *	Var is a subclass of Expr
 */
static void
_outVar(StringInfo str, Var *node)
{
	appendStringInfo(str,
				" VAR :varno %d :varattno %d :vartype %u :vartypmod %d ",
					 node->varno,
					 node->varattno,
					 node->vartype,
					 node->vartypmod);

	appendStringInfo(str, " :varlevelsup %u :varnoold %d :varoattno %d",
					 node->varlevelsup,
					 node->varnoold,
					 node->varoattno);
}

/*
 *	Const is a subclass of Expr
 */
static void
_outConst(StringInfo str, Const *node)
{
	appendStringInfo(str,
		" CONST :consttype %u :constlen %d :constisnull %s :constvalue ",
					 node->consttype,
					 node->constlen,
					 node->constisnull ? "true" : "false");

	if (node->constisnull)
		appendStringInfo(str, "<>");
	else
		_outDatum(str, node->constvalue, node->consttype);

	appendStringInfo(str, " :constbyval %s ",
					 node->constbyval ? "true" : "false");
}

/*
 *	Aggref
 */
static void
_outAggref(StringInfo str, Aggref *node)
{
	appendStringInfo(str,
				 " AGGREG :aggname %s :basetype %u :aggtype %u :target ",
					 stringStringInfo(node->aggname),
					 node->basetype,
					 node->aggtype);
	_outNode(str, node->target);

	appendStringInfo(str, ":aggno %d :usenulls %s",
					 node->aggno,
					 node->usenulls ? "true" : "false");
}

/*
 *	SubLink
 */
static void
_outSubLink(StringInfo str, SubLink *node)
{
	appendStringInfo(str,
					 " SUBLINK :subLinkType %d :useor %s :lefthand ",
					 node->subLinkType,
					 node->useor ? "true" : "false");
	_outNode(str, node->lefthand);

	appendStringInfo(str, " :oper ");
	_outNode(str, node->oper);

	appendStringInfo(str, " :subselect ");
	_outNode(str, node->subselect);
}

/*
 *	Array is a subclass of Expr
 */
static void
_outArray(StringInfo str, Array *node)
{
	int			i;

	appendStringInfo(str,
	  " ARRAY :arrayelemtype %u :arrayelemlength %d :arrayelembyval %c ",
					 node->arrayelemtype,
					 node->arrayelemlength,
					 node->arrayelembyval ? 't' : 'f');

	appendStringInfo(str, " :arrayndim %d :arraylow ", node->arrayndim);
	for (i = 0; i < node->arrayndim; i++)
		appendStringInfo(str, " %d ", node->arraylow.indx[i]);
	appendStringInfo(str, " :arrayhigh ");
	for (i = 0; i < node->arrayndim; i++)
		appendStringInfo(str, " %d ", node->arrayhigh.indx[i]);
	appendStringInfo(str, " :arraylen %d ", node->arraylen);
}

/*
 *	ArrayRef is a subclass of Expr
 */
static void
_outArrayRef(StringInfo str, ArrayRef *node)
{
	appendStringInfo(str,
		" ARRAYREF :refelemtype %u :refattrlength $d :refelemlength %d ",
					 node->refelemtype,
					 node->refattrlength,
					 node->refelemlength);

	appendStringInfo(str, " :refelembyval %c :refupperindex ",
					 node->refelembyval ? 't' : 'f');
	_outNode(str, node->refupperindexpr);

	appendStringInfo(str, " :reflowerindex ");
	_outNode(str, node->reflowerindexpr);

	appendStringInfo(str, " :refexpr ");
	_outNode(str, node->refexpr);

	appendStringInfo(str, " :refassgnexpr ");
	_outNode(str, node->refassgnexpr);
}

/*
 *	Func is a subclass of Expr
 */
static void
_outFunc(StringInfo str, Func *node)
{
	appendStringInfo(str,
		   " FUNC :funcid %u :functype %u :funcisindex %s :funcsize %d ",
					 node->funcid,
					 node->functype,
					 node->funcisindex ? "true" : "false",
					 node->funcsize);

	appendStringInfo(str, " :func_fcache @ 0x%x :func_tlist ",
					 (int) node->func_fcache);
	_outNode(str, node->func_tlist);

	appendStringInfo(str, " :func_planlist ");
	_outNode(str, node->func_planlist);
}

/*
 *	Oper is a subclass of Expr
 */
static void
_outOper(StringInfo str, Oper *node)
{
	appendStringInfo(str,
					 " OPER :opno %u :opid %u :opresulttype %u ",
					 node->opno,
					 node->opid,
					 node->opresulttype);
}

/*
 *	Param is a subclass of Expr
 */
static void
_outParam(StringInfo str, Param *node)
{
	appendStringInfo(str,
		 " PARAM :paramkind %d :paramid %d :paramname %s :paramtype %u ",
					 node->paramkind,
					 node->paramid,
					 stringStringInfo(node->paramname),
					 node->paramtype);

	appendStringInfo(str, " :param_tlist ");
	_outNode(str, node->param_tlist);
}

/*
 *	Stuff from execnodes.h
 */

/*
 *	EState is a subclass of Node.
 */
static void
_outEState(StringInfo str, EState *node)
{
	appendStringInfo(str,
					 " ESTATE :direction %d :range_table ",
					 node->es_direction);
	_outNode(str, node->es_range_table);

	appendStringInfo(str, " :result_relation_info @ 0x%x ",
					 (int) (node->es_result_relation_info));
}

/*
 *	Stuff from relation.h
 */
static void
_outRelOptInfo(StringInfo str, RelOptInfo *node)
{
	appendStringInfo(str, " RELOPTINFO :relids ");
	_outIntList(str, node->relids);

	appendStringInfo(str,
	 " :indexed %s :pages %u :tuples %u :size %u :width %u :targetlist ",
					 node->indexed ? "true" : "false",
					 node->pages,
					 node->tuples,
					 node->size,
					 node->width);
	_outNode(str, node->targetlist);

	appendStringInfo(str, " :pathlist ");
	_outNode(str, node->pathlist);

	/*
	 * Not sure if these are nodes or not.	They're declared as struct
	 * Path *.	Since i don't know, i'll just print the addresses for now.
	 * This can be changed later, if necessary.
	 */

	appendStringInfo(str,
					 " :cheapestpath @ 0x%x :pruneable %s :restrictinfo ",
					 (int) node->cheapestpath,
					 node->pruneable ? "true" : "false");
	_outNode(str, node->restrictinfo);

	appendStringInfo(str, " :joininfo ");
	_outNode(str, node->joininfo);

	appendStringInfo(str, " :innerjoin ");
	_outNode(str, node->innerjoin);
}

/*
 *	TargetEntry is a subclass of Node.
 */
static void
_outTargetEntry(StringInfo str, TargetEntry *node)
{
	appendStringInfo(str, " TARGETENTRY :resdom ");
	_outNode(str, node->resdom);

	appendStringInfo(str, " :expr ");
	_outNode(str, node->expr);
}

static void
_outRangeTblEntry(StringInfo str, RangeTblEntry *node)
{
	appendStringInfo(str,
					 " RTE :relname %s :refname %s :relid %u :inh %s :inFromCl %s :skipAcl %s",
					 stringStringInfo(node->relname),
					 stringStringInfo(node->refname),
					 node->relid,
					 node->inh ? "true" : "false",
					 node->inFromCl ? "true" : "false",
					 node->skipAcl ? "true" : "false");
}

static void
_outRowMark(StringInfo str, RowMark *node)
{
	appendStringInfo(str, " ROWMARK :rti %u :info %u", node->rti, node->info);
}

/*
 *	Path is a subclass of Node.
 */
static void
_outPathOrder(StringInfo str, PathOrder *node)
{
	appendStringInfo(str, " PATHORDER :ordtype %d ",
					 node->ordtype);
	if (node->ordtype == SORTOP_ORDER)
	{
		int			i;

		appendStringInfo(str, " :sortop ");
		if (node->ord.sortop == NULL)
			appendStringInfo(str, "<>");
		else
		{
			for (i = 0; node->ord.sortop[i] != 0; i++)
				appendStringInfo(str, " %d ", node->ord.sortop[i]);
			appendStringInfo(str, " %d ", 0);
		}
	}
	else
	{
		appendStringInfo(str, " :merge ");
		_outNode(str, node->ord.merge);
	}
}

/*
 *	Path is a subclass of Node.
 */
static void
_outPath(StringInfo str, Path *node)
{
	appendStringInfo(str, " PATH :pathtype %d :cost %f :pathkeys ",
					 node->pathtype,
					 node->path_cost);
	_outNode(str, node->pathkeys);

	appendStringInfo(str, " :pathorder ");
	_outNode(str, node->pathorder);
}

/*
 *	IndexPath is a subclass of Path.
 */
static void
_outIndexPath(StringInfo str, IndexPath *node)
{
	appendStringInfo(str,
					 " INDEXPATH :pathtype %d :cost %f :pathkeys ",
					 node->path.pathtype,
					 node->path.path_cost);
	_outNode(str, node->path.pathkeys);

	appendStringInfo(str, " :pathorder ");
	_outNode(str, node->path.pathorder);

	appendStringInfo(str, " :indexid ");
	_outIntList(str, node->indexid);

	appendStringInfo(str, " :indexqual ");
	_outNode(str, node->indexqual);
}

/*
 *	NestPath is a subclass of Path
 */
static void
_outNestPath(StringInfo str, NestPath *node)
{
	appendStringInfo(str,
					 " NESTPATH :pathtype %d :cost %f :pathkeys ",
					 node->path.pathtype,
					 node->path.path_cost);
	_outNode(str, node->path.pathkeys);

	appendStringInfo(str, " :pathorder ");
	_outNode(str, node->path.pathorder);

	appendStringInfo(str, " :pathinfo ");
	_outNode(str, node->pathinfo);

	/*
	 * Not sure if these are nodes; they're declared as "struct path *".
	 * For now, i'll just print the addresses.
	 */

	appendStringInfo(str,
					 " :outerjoinpath @ 0x%x :innerjoinpath @ 0x%x :outjoincost %f :joinid ",
					 (int) node->outerjoinpath,
					 (int) node->innerjoinpath,
					 node->path.outerjoincost);
	_outIntList(str, node->path.joinid);
}

/*
 *	MergePath is a subclass of NestPath.
 */
static void
_outMergePath(StringInfo str, MergePath *node)
{
	appendStringInfo(str,
					 " MERGEPATH :pathtype %d :cost %f :pathkeys ",
					 node->jpath.path.pathtype,
					 node->jpath.path.path_cost);
	_outNode(str, node->jpath.path.pathkeys);

	appendStringInfo(str, " :pathorder ");
	_outNode(str, node->jpath.path.pathorder);

	appendStringInfo(str, " :pathinfo ");
	_outNode(str, node->jpath.pathinfo);

	/*
	 * Not sure if these are nodes; they're declared as "struct path *".
	 * For now, i'll just print the addresses.
	 */

	appendStringInfo(str,
					 " :outerjoinpath @ 0x%x :innerjoinpath @ 0x%x :outerjoincost %f :joinid ",
					 (int) node->jpath.outerjoinpath,
					 (int) node->jpath.innerjoinpath,
					 (int) node->jpath.path.outerjoincost);
	_outIntList(str, node->jpath.path.joinid);

	appendStringInfo(str, " :path_mergeclauses ");
	_outNode(str, node->path_mergeclauses);

	appendStringInfo(str, " :outersortkeys ");
	_outNode(str, node->outersortkeys);

	appendStringInfo(str, " :innersortkeys ");
	_outNode(str, node->innersortkeys);
}

/*
 *	HashPath is a subclass of NestPath.
 */
static void
_outHashPath(StringInfo str, HashPath *node)
{
	appendStringInfo(str,
					 " HASHPATH :pathtype %d :cost %f :pathkeys ",
					 node->jpath.path.pathtype,
					 node->jpath.path.path_cost);
	_outNode(str, node->jpath.path.pathkeys);

	appendStringInfo(str, " :pathorder ");
	_outNode(str, node->jpath.path.pathorder);

	appendStringInfo(str, " :pathinfo ");
	_outNode(str, node->jpath.pathinfo);

	/*
	 * Not sure if these are nodes; they're declared as "struct path *".
	 * For now, i'll just print the addresses.
	 */

	appendStringInfo(str,
					 " :outerjoinpath @ 0x%x :innerjoinpath @ 0x%x :outerjoincost %f :joinid ",
					 (int) node->jpath.outerjoinpath,
					 (int) node->jpath.innerjoinpath,
					 node->jpath.path.outerjoincost);
	_outIntList(str, node->jpath.path.joinid);

	appendStringInfo(str, " :path_hashclauses ");
	_outNode(str, node->path_hashclauses);

	appendStringInfo(str, " :outerhashkeys ");
	_outNode(str, node->outerhashkeys);

	appendStringInfo(str, " :innerhashkeys ");
	_outNode(str, node->innerhashkeys);
}

/*
 *	OrderKey is a subclass of Node.
 */
static void
_outOrderKey(StringInfo str, OrderKey *node)
{
	appendStringInfo(str,
					 " ORDERKEY :attribute_number %d :array_index %d ",
					 node->attribute_number,
					 node->array_index);
}

/*
 *	JoinKey is a subclass of Node.
 */
static void
_outJoinKey(StringInfo str, JoinKey *node)
{
	appendStringInfo(str, " JOINKEY :outer ");
	_outNode(str, node->outer);

	appendStringInfo(str, " :inner ");
	_outNode(str, node->inner);

}

/*
 *	MergeOrder is a subclass of Node.
 */
static void
_outMergeOrder(StringInfo str, MergeOrder *node)
{
	appendStringInfo(str,
	" MERGEORDER :join_operator %u :left_operator %u :right_operator %u ",
					 node->join_operator,
					 node->left_operator,
					 node->right_operator);

	appendStringInfo(str,
					 " :left_type %u :right_type %u ",
					 node->left_type,
					 node->right_type);
}

/*
 *	RestrictInfo is a subclass of Node.
 */
static void
_outRestrictInfo(StringInfo str, RestrictInfo *node)
{
	appendStringInfo(str, " RESTRICTINFO :clause ");
	_outNode(str, node->clause);

	appendStringInfo(str,
					 " :selectivity %f :notclause %s :indexids ",
					 node->selectivity,
					 node->notclause ? "true" : "false");
	_outNode(str, node->indexids);

	appendStringInfo(str, " :mergejoinorder ");
	_outNode(str, node->mergejoinorder);

	appendStringInfo(str, " :hashjoinoperator %u ", node->hashjoinoperator);

}

/*
 *	JoinMethod is a subclass of Node.
 */
static void
_outJoinMethod(StringInfo str, JoinMethod *node)
{
	appendStringInfo(str, " JOINMETHOD :jmkeys ");
	_outNode(str, node->jmkeys);

	appendStringInfo(str, " :clauses ");
	_outNode(str, node->clauses);
}

/*
 * HashInfo is a subclass of JoinMethod.
 */
static void
_outHashInfo(StringInfo str, HashInfo *node)
{
	appendStringInfo(str, " HASHINFO :hashop %u :jmkeys ", node->hashop);
	_outNode(str, node->jmethod.jmkeys);

	appendStringInfo(str, " :clauses ");
	_outNode(str, node->jmethod.clauses);
}

/*
 *	JoinInfo is a subclass of Node.
 */
static void
_outJoinInfo(StringInfo str, JoinInfo *node)
{
	appendStringInfo(str, " JINFO :unjoined_relids ");
	_outIntList(str, node->unjoined_relids);

	appendStringInfo(str, " :jinfo_restrictinfo ");
	_outNode(str, node->jinfo_restrictinfo);

	appendStringInfo(str, " :mergejoinable %s :hashjoinable %s ",
					 node->mergejoinable ? "true" : "false",
					 node->hashjoinable ? "true" : "false");
}

/*
 * Print the value of a Datum given its type.
 */
static void
_outDatum(StringInfo str, Datum value, Oid type)
{
	char	   *s;
	Size		length,
				typeLength;
	bool		byValue;
	int			i;

	/*
	 * find some information about the type and the "real" length of the
	 * datum.
	 */
	byValue = get_typbyval(type);
	typeLength = get_typlen(type);
	length = datumGetSize(value, type, byValue, typeLength);

	if (byValue)
	{
		s = (char *) (&value);
		appendStringInfo(str, " %d [ ", length);
		for (i = 0; i < sizeof(Datum); i++)
			appendStringInfo(str, " %d ", (int) (s[i]));
		appendStringInfo(str, "] ");
	}
	else
	{							/* !byValue */
		s = (char *) DatumGetPointer(value);
		if (!PointerIsValid(s))
			appendStringInfo(str, " 0 [ ] ");
		else
		{

			/*
			 * length is unsigned - very bad to do < comparison to -1
			 * without casting it to int first!! -mer 8 Jan 1991
			 */
			if (((int) length) <= -1)
				length = VARSIZE(s);
			appendStringInfo(str, " %d [ ", length);
			for (i = 0; i < length; i++)
				appendStringInfo(str, " %d ", (int) (s[i]));
			appendStringInfo(str, "] ");
		}
	}
}

static void
_outIter(StringInfo str, Iter *node)
{
	appendStringInfo(str, " ITER :iterexpr ");
	_outNode(str, node->iterexpr);
}

static void
_outStream(StringInfo str, Stream *node)
{
	appendStringInfo(str,
					 " STREAM :pathptr @ 0x%x :cinfo @ 0x%x :clausetype %d :upstream @ 0x%x ",
					 (int) node->pathptr,
					 (int) node->cinfo,
					 (int) node->clausetype,
					 (int) node->upstream);

	appendStringInfo(str,
		   " :downstream @ 0x%x :groupup %d :groupcost %f :groupsel %f ",
					 (int) node->downstream,
					 node->groupup,
					 node->groupcost,
					 node->groupsel);
}

static void
_outAExpr(StringInfo str, A_Expr *node)
{
	appendStringInfo(str, "EXPR ");
	switch (node->oper)
	{
		case AND:
			appendStringInfo(str, "AND");
			break;
		case OR:
			appendStringInfo(str, "OR");
			break;
		case NOT:
			appendStringInfo(str, "NOT");
			break;
		case ISNULL:
			appendStringInfo(str, "ISNULL");
			break;
		case NOTNULL:
			appendStringInfo(str, "NOTNULL");
			break;
		default:
			appendStringInfo(str, stringStringInfo(node->opname));
			break;
	}
	_outNode(str, node->lexpr);
	_outNode(str, node->rexpr);
	return;
}

static void
_outValue(StringInfo str, Value *value)
{
	switch (value->type)
	{
			case T_String:
			appendStringInfo(str, " \"%s\" ", stringStringInfo(value->val.str));
			break;
		case T_Integer:
			appendStringInfo(str, " %ld ", value->val.ival);
			break;
		case T_Float:
			appendStringInfo(str, " %f ", value->val.dval);
			break;
		default:
			break;
	}
	return;
}

static void
_outIdent(StringInfo str, Ident *node)
{
	appendStringInfo(str, " IDENT \"%s\" ", stringStringInfo(node->name));
	return;
}

static void
_outAttr(StringInfo str, Attr *node)
{
	List	   *l;

	appendStringInfo(str, " ATTR \"%s\" ", stringStringInfo(node->relname));

	appendStringInfo(str, "(");
	foreach(l, node->attrs)
	{
		_outNode(str, lfirst(l));
		if (lnext(l))
			appendStringInfo(str, ",");
	}
	appendStringInfo(str, ")");
	return;
}

static void
_outAConst(StringInfo str, A_Const *node)
{
	appendStringInfo(str, "CONST ");
	_outValue(str, &(node->val));
	return;
}

static void
_outConstraint(StringInfo str, Constraint *node)
{
	appendStringInfo(str, " %s :type", stringStringInfo(node->name));

	switch (node->contype)
	{
		case CONSTR_PRIMARY:
			appendStringInfo(str, " PRIMARY KEY ");
			_outNode(str, node->keys);
			break;

		case CONSTR_CHECK:
			appendStringInfo(str, " CHECK %s", stringStringInfo(node->def));
			break;

		case CONSTR_DEFAULT:
			appendStringInfo(str, " DEFAULT %s", stringStringInfo(node->def));
			break;

		case CONSTR_NOTNULL:
			appendStringInfo(str, " NOT NULL ");
			break;

		case CONSTR_UNIQUE:
			appendStringInfo(str, " UNIQUE ");
			_outNode(str, node->keys);
			break;

		default:
			appendStringInfo(str, "<unrecognized constraint>");
			break;
	}
	return;
}

static void
_outCaseExpr(StringInfo str, CaseExpr *node)
{
	appendStringInfo(str, "CASE ");
	_outNode(str, node->args);

	appendStringInfo(str, " :default ");
	_outNode(str, node->defresult);

	return;
}

static void
_outCaseWhen(StringInfo str, CaseWhen *node)
{
	appendStringInfo(str, " WHEN ");
	_outNode(str, node->expr);

	appendStringInfo(str, " :then ");
	_outNode(str, node->result);

	return;
}

/*
 * _outNode -
 *	  converts a Node into ascii string and append it to 'str'
 */
static void
_outNode(StringInfo str, void *obj)
{
	if (obj == NULL)
	{
		appendStringInfo(str, "<>");
		return;
	}

	if (nodeTag(obj) == T_List)
	{
		List	   *l;

		appendStringInfo(str, "(");
		foreach(l, (List *) obj)
		{
			_outNode(str, lfirst(l));
			if (lnext(l))
				appendStringInfo(str, " ");
		}
		appendStringInfo(str, ")");
	}
	else
	{
		appendStringInfo(str, "{");
		switch (nodeTag(obj))
		{
			case T_CreateStmt:
				_outCreateStmt(str, obj);
				break;
			case T_IndexStmt:
				_outIndexStmt(str, obj);
				break;

			case T_ColumnDef:
				_outColumnDef(str, obj);
				break;
			case T_TypeName:
				_outTypeName(str, obj);
				break;
			case T_IndexElem:
				_outIndexElem(str, obj);
				break;
			case T_Query:
				_outQuery(str, obj);
				break;
			case T_SortClause:
				_outSortClause(str, obj);
				break;
			case T_GroupClause:
				_outGroupClause(str, obj);
				break;
			case T_Plan:
				_outPlan(str, obj);
				break;
			case T_Result:
				_outResult(str, obj);
				break;
			case T_Append:
				_outAppend(str, obj);
				break;
			case T_Join:
				_outJoin(str, obj);
				break;
			case T_NestLoop:
				_outNestLoop(str, obj);
				break;
			case T_MergeJoin:
				_outMergeJoin(str, obj);
				break;
			case T_HashJoin:
				_outHashJoin(str, obj);
				break;
			case T_Scan:
				_outScan(str, obj);
				break;
			case T_SeqScan:
				_outSeqScan(str, obj);
				break;
			case T_IndexScan:
				_outIndexScan(str, obj);
				break;
			case T_Noname:
				_outNoname(str, obj);
				break;
			case T_Sort:
				_outSort(str, obj);
				break;
			case T_Agg:
				_outAgg(str, obj);
				break;
			case T_Group:
				_outGroup(str, obj);
				break;
			case T_Unique:
				_outUnique(str, obj);
				break;
			case T_Hash:
				_outHash(str, obj);
				break;
			case T_SubPlan:
				_outSubPlan(str, obj);
				break;
			case T_Resdom:
				_outResdom(str, obj);
				break;
			case T_Fjoin:
				_outFjoin(str, obj);
				break;
			case T_Expr:
				_outExpr(str, obj);
				break;
			case T_Var:
				_outVar(str, obj);
				break;
			case T_Const:
				_outConst(str, obj);
				break;
			case T_Aggref:
				_outAggref(str, obj);
				break;
			case T_SubLink:
				_outSubLink(str, obj);
				break;
			case T_Array:
				_outArray(str, obj);
				break;
			case T_ArrayRef:
				_outArrayRef(str, obj);
				break;
			case T_Func:
				_outFunc(str, obj);
				break;
			case T_Oper:
				_outOper(str, obj);
				break;
			case T_Param:
				_outParam(str, obj);
				break;
			case T_EState:
				_outEState(str, obj);
				break;
			case T_RelOptInfo:
				_outRelOptInfo(str, obj);
				break;
			case T_TargetEntry:
				_outTargetEntry(str, obj);
				break;
			case T_RangeTblEntry:
				_outRangeTblEntry(str, obj);
				break;
			case T_RowMark:
				_outRowMark(str, obj);
				break;
			case T_PathOrder:
				_outPathOrder(str, obj);
				break;
			case T_Path:
				_outPath(str, obj);
				break;
			case T_IndexPath:
				_outIndexPath(str, obj);
				break;
			case T_NestPath:
				_outNestPath(str, obj);
				break;
			case T_MergePath:
				_outMergePath(str, obj);
				break;
			case T_HashPath:
				_outHashPath(str, obj);
				break;
			case T_OrderKey:
				_outOrderKey(str, obj);
				break;
			case T_JoinKey:
				_outJoinKey(str, obj);
				break;
			case T_MergeOrder:
				_outMergeOrder(str, obj);
				break;
			case T_RestrictInfo:
				_outRestrictInfo(str, obj);
				break;
			case T_JoinMethod:
				_outJoinMethod(str, obj);
				break;
			case T_HashInfo:
				_outHashInfo(str, obj);
				break;
			case T_JoinInfo:
				_outJoinInfo(str, obj);
				break;
			case T_Iter:
				_outIter(str, obj);
				break;
			case T_Stream:
				_outStream(str, obj);
				break;
			case T_Integer:
			case T_String:
			case T_Float:
				_outValue(str, obj);
				break;
			case T_A_Expr:
				_outAExpr(str, obj);
				break;
			case T_Ident:
				_outIdent(str, obj);
				break;
			case T_A_Const:
				_outAConst(str, obj);
				break;
			case T_Constraint:
				_outConstraint(str, obj);
				break;
			case T_CaseExpr:
				_outCaseExpr(str, obj);
				break;
			case T_CaseWhen:
				_outCaseWhen(str, obj);
				break;

			case T_VariableSetStmt:
				break;
			case T_SelectStmt:
				_outSelectStmt(str, obj);
				break;
			case T_FuncCall:
				_outFuncCall(str, obj);
				break;
			case T_Attr:
				_outAttr(str, obj);
				break;

			default:
				elog(NOTICE, "_outNode: don't know how to print type %d ",
					 nodeTag(obj));
				break;
		}
		appendStringInfo(str, "}");
	}
	return;
}

/*
 * nodeToString -
 *	   returns the ascii representation of the Node as a palloc'd string
 */
char *
nodeToString(void *obj)
{
	StringInfoData str;

	/* see stringinfo.h for an explanation of this maneuver */
	initStringInfo(&str);
	_outNode(&str, obj);
	return str.data;
}