outfuncs.c

PostgreSQL 8.1.4的源码 适用于Linux下的开源数据库系统

/*-------------------------------------------------------------------------
 *
 * outfuncs.c
 *	  Output functions for Postgres tree nodes.
 *
 * Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 *
 * IDENTIFICATION
 *	  $PostgreSQL: pgsql/src/backend/nodes/outfuncs.c,v 1.261.2.1 2005/11/14 23:54:34 tgl Exp $
 *
 * NOTES
 *	  Every node type that can appear in stored rules' parsetrees *must*
 *	  have an output function defined here (as well as an input function
 *	  in readfuncs.c).	For use in debugging, we also provide output
 *	  functions for nodes that appear in raw parsetrees, path, and plan trees.
 *	  These nodes however need not have input functions.
 *
 *-------------------------------------------------------------------------
 */
#include "postgres.h"

#include <ctype.h>

#include "lib/stringinfo.h"
#include "nodes/parsenodes.h"
#include "nodes/plannodes.h"
#include "nodes/relation.h"
#include "utils/datum.h"


/*
 * Macros to simplify output of different kinds of fields.	Use these
 * wherever possible to reduce the chance for silly typos.	Note that these
 * hard-wire conventions about the names of the local variables in an Out
 * routine.
 */

/* Write the label for the node type */
#define WRITE_NODE_TYPE(nodelabel) \
	appendStringInfoString(str, nodelabel)

/* Write an integer field (anything written as ":fldname %d") */
#define WRITE_INT_FIELD(fldname) \
	appendStringInfo(str, " :" CppAsString(fldname) " %d", node->fldname)

/* Write an unsigned integer field (anything written as ":fldname %u") */
#define WRITE_UINT_FIELD(fldname) \
	appendStringInfo(str, " :" CppAsString(fldname) " %u", node->fldname)

/* Write an OID field (don't hard-wire assumption that OID is same as uint) */
#define WRITE_OID_FIELD(fldname) \
	appendStringInfo(str, " :" CppAsString(fldname) " %u", node->fldname)

/* Write a long-integer field */
#define WRITE_LONG_FIELD(fldname) \
	appendStringInfo(str, " :" CppAsString(fldname) " %ld", node->fldname)

/* Write a char field (ie, one ascii character) */
#define WRITE_CHAR_FIELD(fldname) \
	appendStringInfo(str, " :" CppAsString(fldname) " %c", node->fldname)

/* Write an enumerated-type field as an integer code */
#define WRITE_ENUM_FIELD(fldname, enumtype) \
	appendStringInfo(str, " :" CppAsString(fldname) " %d", \
					 (int) node->fldname)

/* Write a float field --- caller must give format to define precision */
#define WRITE_FLOAT_FIELD(fldname,format) \
	appendStringInfo(str, " :" CppAsString(fldname) " " format, node->fldname)

/* Write a boolean field */
#define WRITE_BOOL_FIELD(fldname) \
	appendStringInfo(str, " :" CppAsString(fldname) " %s", \
					 booltostr(node->fldname))

/* Write a character-string (possibly NULL) field */
#define WRITE_STRING_FIELD(fldname) \
	(appendStringInfo(str, " :" CppAsString(fldname) " "), \
	 _outToken(str, node->fldname))

/* Write a Node field */
#define WRITE_NODE_FIELD(fldname) \
	(appendStringInfo(str, " :" CppAsString(fldname) " "), \
	 _outNode(str, node->fldname))

/* Write a bitmapset field */
#define WRITE_BITMAPSET_FIELD(fldname) \
	(appendStringInfo(str, " :" CppAsString(fldname) " "), \
	 _outBitmapset(str, node->fldname))


#define booltostr(x)  ((x) ? "true" : "false")

static void _outNode(StringInfo str, void *obj);


/*
 * _outToken
 *	  Convert an ordinary string (eg, an identifier) into a form that
 *	  will be decoded back to a plain token by read.c's functions.
 *
 *	  If a null or empty string is given, it is encoded as "<>".
 */
static void
_outToken(StringInfo str, char *s)
{
	if (s == NULL || *s == '\0')
	{
		appendStringInfo(str, "<>");
		return;
	}

	/*
	 * Look for characters or patterns that are treated specially by read.c
	 * (either in pg_strtok() or in nodeRead()), and therefore need a
	 * protective backslash.
	 */
	/* These characters only need to be quoted at the start of the string */
	if (*s == '<' ||
		*s == '\"' ||
		isdigit((unsigned char) *s) ||
		((*s == '+' || *s == '-') &&
		 (isdigit((unsigned char) s[1]) || s[1] == '.')))
		appendStringInfoChar(str, '\\');
	while (*s)
	{
		/* These chars must be backslashed anywhere in the string */
		if (*s == ' ' || *s == '\n' || *s == '\t' ||
			*s == '(' || *s == ')' || *s == '{' || *s == '}' ||
			*s == '\\')
			appendStringInfoChar(str, '\\');
		appendStringInfoChar(str, *s++);
	}
}

static void
_outList(StringInfo str, List *node)
{
	ListCell   *lc;

	appendStringInfoChar(str, '(');

	if (IsA(node, IntList))
		appendStringInfoChar(str, 'i');
	else if (IsA(node, OidList))
		appendStringInfoChar(str, 'o');

	foreach(lc, node)
	{
		/*
		 * For the sake of backward compatibility, we emit a slightly
		 * different whitespace format for lists of nodes vs. other types of
		 * lists. XXX: is this necessary?
		 */
		if (IsA(node, List))
		{
			_outNode(str, lfirst(lc));
			if (lnext(lc))
				appendStringInfoChar(str, ' ');
		}
		else if (IsA(node, IntList))
			appendStringInfo(str, " %d", lfirst_int(lc));
		else if (IsA(node, OidList))
			appendStringInfo(str, " %u", lfirst_oid(lc));
		else
			elog(ERROR, "unrecognized list node type: %d",
				 (int) node->type);
	}

	appendStringInfoChar(str, ')');
}

/*
 * _outBitmapset -
 *	   converts a bitmap set of integers
 *
 * Note: the output format is "(b int int ...)", similar to an integer List.
 * Currently bitmapsets do not appear in any node type that is stored in
 * rules, so there is no support in readfuncs.c for reading this format.
 */
static void
_outBitmapset(StringInfo str, Bitmapset *bms)
{
	Bitmapset  *tmpset;
	int			x;

	appendStringInfoChar(str, '(');
	appendStringInfoChar(str, 'b');
	tmpset = bms_copy(bms);
	while ((x = bms_first_member(tmpset)) >= 0)
		appendStringInfo(str, " %d", x);
	bms_free(tmpset);
	appendStringInfoChar(str, ')');
}

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

	length = datumGetSize(value, typbyval, typlen);

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


/*
 *	Stuff from plannodes.h
 */

/*
 * print the basic stuff of all nodes that inherit from Plan
 */
static void
_outPlanInfo(StringInfo str, Plan *node)
{
	WRITE_FLOAT_FIELD(startup_cost, "%.2f");
	WRITE_FLOAT_FIELD(total_cost, "%.2f");
	WRITE_FLOAT_FIELD(plan_rows, "%.0f");
	WRITE_INT_FIELD(plan_width);
	WRITE_NODE_FIELD(targetlist);
	WRITE_NODE_FIELD(qual);
	WRITE_NODE_FIELD(lefttree);
	WRITE_NODE_FIELD(righttree);
	WRITE_NODE_FIELD(initPlan);
	WRITE_BITMAPSET_FIELD(extParam);
	WRITE_BITMAPSET_FIELD(allParam);
	WRITE_INT_FIELD(nParamExec);
}

/*
 * print the basic stuff of all nodes that inherit from Scan
 */
static void
_outScanInfo(StringInfo str, Scan *node)
{
	_outPlanInfo(str, (Plan *) node);

	WRITE_UINT_FIELD(scanrelid);
}

/*
 * print the basic stuff of all nodes that inherit from Join
 */
static void
_outJoinPlanInfo(StringInfo str, Join *node)
{
	_outPlanInfo(str, (Plan *) node);

	WRITE_ENUM_FIELD(jointype, JoinType);
	WRITE_NODE_FIELD(joinqual);
}


static void
_outPlan(StringInfo str, Plan *node)
{
	WRITE_NODE_TYPE("PLAN");

	_outPlanInfo(str, (Plan *) node);
}

static void
_outResult(StringInfo str, Result *node)
{
	WRITE_NODE_TYPE("RESULT");

	_outPlanInfo(str, (Plan *) node);

	WRITE_NODE_FIELD(resconstantqual);
}

static void
_outAppend(StringInfo str, Append *node)
{
	WRITE_NODE_TYPE("APPEND");

	_outPlanInfo(str, (Plan *) node);

	WRITE_NODE_FIELD(appendplans);
	WRITE_BOOL_FIELD(isTarget);
}

static void
_outBitmapAnd(StringInfo str, BitmapAnd *node)
{
	WRITE_NODE_TYPE("BITMAPAND");

	_outPlanInfo(str, (Plan *) node);

	WRITE_NODE_FIELD(bitmapplans);
}

static void
_outBitmapOr(StringInfo str, BitmapOr *node)
{
	WRITE_NODE_TYPE("BITMAPOR");

	_outPlanInfo(str, (Plan *) node);

	WRITE_NODE_FIELD(bitmapplans);
}

static void
_outScan(StringInfo str, Scan *node)
{
	WRITE_NODE_TYPE("SCAN");

	_outScanInfo(str, (Scan *) node);
}

static void
_outSeqScan(StringInfo str, SeqScan *node)
{
	WRITE_NODE_TYPE("SEQSCAN");

	_outScanInfo(str, (Scan *) node);
}

static void
_outIndexScan(StringInfo str, IndexScan *node)
{
	WRITE_NODE_TYPE("INDEXSCAN");

	_outScanInfo(str, (Scan *) node);

	WRITE_OID_FIELD(indexid);
	WRITE_NODE_FIELD(indexqual);
	WRITE_NODE_FIELD(indexqualorig);
	WRITE_NODE_FIELD(indexstrategy);
	WRITE_NODE_FIELD(indexsubtype);
	WRITE_ENUM_FIELD(indexorderdir, ScanDirection);
}

static void
_outBitmapIndexScan(StringInfo str, BitmapIndexScan *node)
{
	WRITE_NODE_TYPE("BITMAPINDEXSCAN");

	_outScanInfo(str, (Scan *) node);

	WRITE_OID_FIELD(indexid);
	WRITE_NODE_FIELD(indexqual);
	WRITE_NODE_FIELD(indexqualorig);
	WRITE_NODE_FIELD(indexstrategy);
	WRITE_NODE_FIELD(indexsubtype);
}

static void
_outBitmapHeapScan(StringInfo str, BitmapHeapScan *node)
{
	WRITE_NODE_TYPE("BITMAPHEAPSCAN");

	_outScanInfo(str, (Scan *) node);

	WRITE_NODE_FIELD(bitmapqualorig);
}

static void
_outTidScan(StringInfo str, TidScan *node)
{
	WRITE_NODE_TYPE("TIDSCAN");

	_outScanInfo(str, (Scan *) node);

	WRITE_NODE_FIELD(tideval);
}

static void
_outSubqueryScan(StringInfo str, SubqueryScan *node)
{
	WRITE_NODE_TYPE("SUBQUERYSCAN");

	_outScanInfo(str, (Scan *) node);

	WRITE_NODE_FIELD(subplan);
}

static void
_outFunctionScan(StringInfo str, FunctionScan *node)
{
	WRITE_NODE_TYPE("FUNCTIONSCAN");

	_outScanInfo(str, (Scan *) node);
}

static void
_outJoin(StringInfo str, Join *node)
{
	WRITE_NODE_TYPE("JOIN");

	_outJoinPlanInfo(str, (Join *) node);
}

static void
_outNestLoop(StringInfo str, NestLoop *node)
{
	WRITE_NODE_TYPE("NESTLOOP");

	_outJoinPlanInfo(str, (Join *) node);
}

static void
_outMergeJoin(StringInfo str, MergeJoin *node)
{
	WRITE_NODE_TYPE("MERGEJOIN");

	_outJoinPlanInfo(str, (Join *) node);

	WRITE_NODE_FIELD(mergeclauses);
}

static void
_outHashJoin(StringInfo str, HashJoin *node)
{
	WRITE_NODE_TYPE("HASHJOIN");

	_outJoinPlanInfo(str, (Join *) node);

	WRITE_NODE_FIELD(hashclauses);
}

static void
_outAgg(StringInfo str, Agg *node)
{
	WRITE_NODE_TYPE("AGG");

	_outPlanInfo(str, (Plan *) node);

	WRITE_ENUM_FIELD(aggstrategy, AggStrategy);
	WRITE_INT_FIELD(numCols);
	WRITE_LONG_FIELD(numGroups);
}

static void
_outGroup(StringInfo str, Group *node)
{
	int			i;

	WRITE_NODE_TYPE("GROUP");

	_outPlanInfo(str, (Plan *) node);

	WRITE_INT_FIELD(numCols);

	appendStringInfo(str, " :grpColIdx");
	for (i = 0; i < node->numCols; i++)
		appendStringInfo(str, " %d", node->grpColIdx[i]);
}

static void
_outMaterial(StringInfo str, Material *node)
{
	WRITE_NODE_TYPE("MATERIAL");

	_outPlanInfo(str, (Plan *) node);
}

static void
_outSort(StringInfo str, Sort *node)
{
	int			i;

	WRITE_NODE_TYPE("SORT");

	_outPlanInfo(str, (Plan *) node);

	WRITE_INT_FIELD(numCols);

	appendStringInfo(str, " :sortColIdx");
	for (i = 0; i < node->numCols; i++)
		appendStringInfo(str, " %d", node->sortColIdx[i]);

	appendStringInfo(str, " :sortOperators");
	for (i = 0; i < node->numCols; i++)
		appendStringInfo(str, " %u", node->sortOperators[i]);
}

static void
_outUnique(StringInfo str, Unique *node)
{
	int			i;

	WRITE_NODE_TYPE("UNIQUE");

	_outPlanInfo(str, (Plan *) node);

	WRITE_INT_FIELD(numCols);

	appendStringInfo(str, " :uniqColIdx");
	for (i = 0; i < node->numCols; i++)
		appendStringInfo(str, " %d", node->uniqColIdx[i]);
}

static void
_outSetOp(StringInfo str, SetOp *node)
{
	int			i;

	WRITE_NODE_TYPE("SETOP");

	_outPlanInfo(str, (Plan *) node);

	WRITE_ENUM_FIELD(cmd, SetOpCmd);
	WRITE_INT_FIELD(numCols);

	appendStringInfo(str, " :dupColIdx");
	for (i = 0; i < node->numCols; i++)
		appendStringInfo(str, " %d", node->dupColIdx[i]);

	WRITE_INT_FIELD(flagColIdx);
}

static void
_outLimit(StringInfo str, Limit *node)
{
	WRITE_NODE_TYPE("LIMIT");

	_outPlanInfo(str, (Plan *) node);

	WRITE_NODE_FIELD(limitOffset);
	WRITE_NODE_FIELD(limitCount);
}

static void
_outHash(StringInfo str, Hash *node)
{
	WRITE_NODE_TYPE("HASH");

	_outPlanInfo(str, (Plan *) node);
}

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

static void
_outAlias(StringInfo str, Alias *node)
{
	WRITE_NODE_TYPE("ALIAS");

	WRITE_STRING_FIELD(aliasname);
	WRITE_NODE_FIELD(colnames);
}

static void
_outRangeVar(StringInfo str, RangeVar *node)
{
	WRITE_NODE_TYPE("RANGEVAR");

	/*
	 * we deliberately ignore catalogname here, since it is presently not
	 * semantically meaningful
	 */
	WRITE_STRING_FIELD(schemaname);
	WRITE_STRING_FIELD(relname);
	WRITE_ENUM_FIELD(inhOpt, InhOption);
	WRITE_BOOL_FIELD(istemp);
	WRITE_NODE_FIELD(alias);
}

static void
_outVar(StringInfo str, Var *node)
{
	WRITE_NODE_TYPE("VAR");

	WRITE_UINT_FIELD(varno);
	WRITE_INT_FIELD(varattno);
	WRITE_OID_FIELD(vartype);
	WRITE_INT_FIELD(vartypmod);
	WRITE_UINT_FIELD(varlevelsup);
	WRITE_UINT_FIELD(varnoold);
	WRITE_INT_FIELD(varoattno);
}

static void
_outConst(StringInfo str, Const *node)
{
	WRITE_NODE_TYPE("CONST");

	WRITE_OID_FIELD(consttype);
	WRITE_INT_FIELD(constlen);
	WRITE_BOOL_FIELD(constbyval);
	WRITE_BOOL_FIELD(constisnull);

	appendStringInfo(str, " :constvalue ");
	if (node->constisnull)
		appendStringInfo(str, "<>");
	else
		_outDatum(str, node->constvalue, node->constlen, node->constbyval);
}

static void
_outParam(StringInfo str, Param *node)
{
	WRITE_NODE_TYPE("PARAM");

	WRITE_INT_FIELD(paramkind);
	WRITE_INT_FIELD(paramid);
	WRITE_STRING_FIELD(paramname);
	WRITE_OID_FIELD(paramtype);
}

static void
_outAggref(StringInfo str, Aggref *node)
{
	WRITE_NODE_TYPE("AGGREF");

	WRITE_OID_FIELD(aggfnoid);
	WRITE_OID_FIELD(aggtype);
	WRITE_NODE_FIELD(target);
	WRITE_UINT_FIELD(agglevelsup);
	WRITE_BOOL_FIELD(aggstar);
	WRITE_BOOL_FIELD(aggdistinct);
}

static void
_outArrayRef(StringInfo str, ArrayRef *node)
{
	WRITE_NODE_TYPE("ARRAYREF");

	WRITE_OID_FIELD(refrestype);
	WRITE_OID_FIELD(refarraytype);
	WRITE_OID_FIELD(refelemtype);
	WRITE_NODE_FIELD(refupperindexpr);
	WRITE_NODE_FIELD(reflowerindexpr);
	WRITE_NODE_FIELD(refexpr);
	WRITE_NODE_FIELD(refassgnexpr);
}

static void
_outFuncExpr(StringInfo str, FuncExpr *node)
{
	WRITE_NODE_TYPE("FUNCEXPR");

	WRITE_OID_FIELD(funcid);
	WRITE_OID_FIELD(funcresulttype);
	WRITE_BOOL_FIELD(funcretset);
	WRITE_ENUM_FIELD(funcformat, CoercionForm);
	WRITE_NODE_FIELD(args);
}

static void
_outOpExpr(StringInfo str, OpExpr *node)
{
	WRITE_NODE_TYPE("OPEXPR");

	WRITE_OID_FIELD(opno);
	WRITE_OID_FIELD(opfuncid);
	WRITE_OID_FIELD(opresulttype);
	WRITE_BOOL_FIELD(opretset);
	WRITE_NODE_FIELD(args);
}

static void
_outDistinctExpr(StringInfo str, DistinctExpr *node)
{
	WRITE_NODE_TYPE("DISTINCTEXPR");

	WRITE_OID_FIELD(opno);
	WRITE_OID_FIELD(opfuncid);
	WRITE_OID_FIELD(opresulttype);
	WRITE_BOOL_FIELD(opretset);
	WRITE_NODE_FIELD(args);
}

static void
_outScalarArrayOpExpr(StringInfo str, ScalarArrayOpExpr *node)
{
	WRITE_NODE_TYPE("SCALARARRAYOPEXPR");

	WRITE_OID_FIELD(opno);
	WRITE_OID_FIELD(opfuncid);
	WRITE_BOOL_FIELD(useOr);
	WRITE_NODE_FIELD(args);
}

static void
_outBoolExpr(StringInfo str, BoolExpr *node)
{
	char	   *opstr = NULL;