copyfuncs.c

PostgreSQL 8.1.4的源码 适用于Linux下的开源数据库系统

_copyRangeVar(RangeVar *from)
{
	RangeVar   *newnode = makeNode(RangeVar);

	COPY_STRING_FIELD(catalogname);
	COPY_STRING_FIELD(schemaname);
	COPY_STRING_FIELD(relname);
	COPY_SCALAR_FIELD(inhOpt);
	COPY_SCALAR_FIELD(istemp);
	COPY_NODE_FIELD(alias);

	return newnode;
}

/*
 * We don't need a _copyExpr because Expr is an abstract supertype which
 * should never actually get instantiated.	Also, since it has no common
 * fields except NodeTag, there's no need for a helper routine to factor
 * out copying the common fields...
 */

/*
 * _copyVar
 */
static Var *
_copyVar(Var *from)
{
	Var		   *newnode = makeNode(Var);

	COPY_SCALAR_FIELD(varno);
	COPY_SCALAR_FIELD(varattno);
	COPY_SCALAR_FIELD(vartype);
	COPY_SCALAR_FIELD(vartypmod);
	COPY_SCALAR_FIELD(varlevelsup);
	COPY_SCALAR_FIELD(varnoold);
	COPY_SCALAR_FIELD(varoattno);

	return newnode;
}

/*
 * _copyConst
 */
static Const *
_copyConst(Const *from)
{
	Const	   *newnode = makeNode(Const);

	COPY_SCALAR_FIELD(consttype);
	COPY_SCALAR_FIELD(constlen);

	if (from->constbyval || from->constisnull)
	{
		/*
		 * passed by value so just copy the datum. Also, don't try to copy
		 * struct when value is null!
		 */
		newnode->constvalue = from->constvalue;
	}
	else
	{
		/*
		 * passed by reference.  We need a palloc'd copy.
		 */
		newnode->constvalue = datumCopy(from->constvalue,
										from->constbyval,
										from->constlen);
	}

	COPY_SCALAR_FIELD(constisnull);
	COPY_SCALAR_FIELD(constbyval);

	return newnode;
}

/*
 * _copyParam
 */
static Param *
_copyParam(Param *from)
{
	Param	   *newnode = makeNode(Param);

	COPY_SCALAR_FIELD(paramkind);
	COPY_SCALAR_FIELD(paramid);
	COPY_STRING_FIELD(paramname);
	COPY_SCALAR_FIELD(paramtype);

	return newnode;
}

/*
 * _copyAggref
 */
static Aggref *
_copyAggref(Aggref *from)
{
	Aggref	   *newnode = makeNode(Aggref);

	COPY_SCALAR_FIELD(aggfnoid);
	COPY_SCALAR_FIELD(aggtype);
	COPY_NODE_FIELD(target);
	COPY_SCALAR_FIELD(agglevelsup);
	COPY_SCALAR_FIELD(aggstar);
	COPY_SCALAR_FIELD(aggdistinct);

	return newnode;
}

/*
 * _copyArrayRef
 */
static ArrayRef *
_copyArrayRef(ArrayRef *from)
{
	ArrayRef   *newnode = makeNode(ArrayRef);

	COPY_SCALAR_FIELD(refrestype);
	COPY_SCALAR_FIELD(refarraytype);
	COPY_SCALAR_FIELD(refelemtype);
	COPY_NODE_FIELD(refupperindexpr);
	COPY_NODE_FIELD(reflowerindexpr);
	COPY_NODE_FIELD(refexpr);
	COPY_NODE_FIELD(refassgnexpr);

	return newnode;
}

/*
 * _copyFuncExpr
 */
static FuncExpr *
_copyFuncExpr(FuncExpr *from)
{
	FuncExpr   *newnode = makeNode(FuncExpr);

	COPY_SCALAR_FIELD(funcid);
	COPY_SCALAR_FIELD(funcresulttype);
	COPY_SCALAR_FIELD(funcretset);
	COPY_SCALAR_FIELD(funcformat);
	COPY_NODE_FIELD(args);

	return newnode;
}

/*
 * _copyOpExpr
 */
static OpExpr *
_copyOpExpr(OpExpr *from)
{
	OpExpr	   *newnode = makeNode(OpExpr);

	COPY_SCALAR_FIELD(opno);
	COPY_SCALAR_FIELD(opfuncid);
	COPY_SCALAR_FIELD(opresulttype);
	COPY_SCALAR_FIELD(opretset);
	COPY_NODE_FIELD(args);

	return newnode;
}

/*
 * _copyDistinctExpr (same as OpExpr)
 */
static DistinctExpr *
_copyDistinctExpr(DistinctExpr *from)
{
	DistinctExpr *newnode = makeNode(DistinctExpr);

	COPY_SCALAR_FIELD(opno);
	COPY_SCALAR_FIELD(opfuncid);
	COPY_SCALAR_FIELD(opresulttype);
	COPY_SCALAR_FIELD(opretset);
	COPY_NODE_FIELD(args);

	return newnode;
}

/*
 * _copyScalarArrayOpExpr
 */
static ScalarArrayOpExpr *
_copyScalarArrayOpExpr(ScalarArrayOpExpr *from)
{
	ScalarArrayOpExpr *newnode = makeNode(ScalarArrayOpExpr);

	COPY_SCALAR_FIELD(opno);
	COPY_SCALAR_FIELD(opfuncid);
	COPY_SCALAR_FIELD(useOr);
	COPY_NODE_FIELD(args);

	return newnode;
}

/*
 * _copyBoolExpr
 */
static BoolExpr *
_copyBoolExpr(BoolExpr *from)
{
	BoolExpr   *newnode = makeNode(BoolExpr);

	COPY_SCALAR_FIELD(boolop);
	COPY_NODE_FIELD(args);

	return newnode;
}

/*
 * _copySubLink
 */
static SubLink *
_copySubLink(SubLink *from)
{
	SubLink    *newnode = makeNode(SubLink);

	COPY_SCALAR_FIELD(subLinkType);
	COPY_SCALAR_FIELD(useOr);
	COPY_NODE_FIELD(lefthand);
	COPY_NODE_FIELD(operName);
	COPY_NODE_FIELD(operOids);
	COPY_NODE_FIELD(subselect);

	return newnode;
}

/*
 * _copySubPlan
 */
static SubPlan *
_copySubPlan(SubPlan *from)
{
	SubPlan    *newnode = makeNode(SubPlan);

	COPY_SCALAR_FIELD(subLinkType);
	COPY_SCALAR_FIELD(useOr);
	COPY_NODE_FIELD(exprs);
	COPY_NODE_FIELD(paramIds);
	COPY_NODE_FIELD(plan);
	COPY_SCALAR_FIELD(plan_id);
	COPY_NODE_FIELD(rtable);
	COPY_SCALAR_FIELD(useHashTable);
	COPY_SCALAR_FIELD(unknownEqFalse);
	COPY_NODE_FIELD(setParam);
	COPY_NODE_FIELD(parParam);
	COPY_NODE_FIELD(args);

	return newnode;
}

/*
 * _copyFieldSelect
 */
static FieldSelect *
_copyFieldSelect(FieldSelect *from)
{
	FieldSelect *newnode = makeNode(FieldSelect);

	COPY_NODE_FIELD(arg);
	COPY_SCALAR_FIELD(fieldnum);
	COPY_SCALAR_FIELD(resulttype);
	COPY_SCALAR_FIELD(resulttypmod);

	return newnode;
}

/*
 * _copyFieldStore
 */
static FieldStore *
_copyFieldStore(FieldStore *from)
{
	FieldStore *newnode = makeNode(FieldStore);

	COPY_NODE_FIELD(arg);
	COPY_NODE_FIELD(newvals);
	COPY_NODE_FIELD(fieldnums);
	COPY_SCALAR_FIELD(resulttype);

	return newnode;
}

/*
 * _copyRelabelType
 */
static RelabelType *
_copyRelabelType(RelabelType *from)
{
	RelabelType *newnode = makeNode(RelabelType);

	COPY_NODE_FIELD(arg);
	COPY_SCALAR_FIELD(resulttype);
	COPY_SCALAR_FIELD(resulttypmod);
	COPY_SCALAR_FIELD(relabelformat);

	return newnode;
}

/*
 * _copyConvertRowtypeExpr
 */
static ConvertRowtypeExpr *
_copyConvertRowtypeExpr(ConvertRowtypeExpr *from)
{
	ConvertRowtypeExpr *newnode = makeNode(ConvertRowtypeExpr);

	COPY_NODE_FIELD(arg);
	COPY_SCALAR_FIELD(resulttype);
	COPY_SCALAR_FIELD(convertformat);

	return newnode;
}

/*
 * _copyCaseExpr
 */
static CaseExpr *
_copyCaseExpr(CaseExpr *from)
{
	CaseExpr   *newnode = makeNode(CaseExpr);

	COPY_SCALAR_FIELD(casetype);
	COPY_NODE_FIELD(arg);
	COPY_NODE_FIELD(args);
	COPY_NODE_FIELD(defresult);

	return newnode;
}

/*
 * _copyCaseWhen
 */
static CaseWhen *
_copyCaseWhen(CaseWhen *from)
{
	CaseWhen   *newnode = makeNode(CaseWhen);

	COPY_NODE_FIELD(expr);
	COPY_NODE_FIELD(result);

	return newnode;
}

/*
 * _copyCaseTestExpr
 */
static CaseTestExpr *
_copyCaseTestExpr(CaseTestExpr *from)
{
	CaseTestExpr *newnode = makeNode(CaseTestExpr);

	COPY_SCALAR_FIELD(typeId);
	COPY_SCALAR_FIELD(typeMod);

	return newnode;
}

/*
 * _copyArrayExpr
 */
static ArrayExpr *
_copyArrayExpr(ArrayExpr *from)
{
	ArrayExpr  *newnode = makeNode(ArrayExpr);

	COPY_SCALAR_FIELD(array_typeid);
	COPY_SCALAR_FIELD(element_typeid);
	COPY_NODE_FIELD(elements);
	COPY_SCALAR_FIELD(multidims);

	return newnode;
}

/*
 * _copyRowExpr
 */
static RowExpr *
_copyRowExpr(RowExpr *from)
{
	RowExpr    *newnode = makeNode(RowExpr);

	COPY_NODE_FIELD(args);
	COPY_SCALAR_FIELD(row_typeid);
	COPY_SCALAR_FIELD(row_format);

	return newnode;
}

/*
 * _copyCoalesceExpr
 */
static CoalesceExpr *
_copyCoalesceExpr(CoalesceExpr *from)
{
	CoalesceExpr *newnode = makeNode(CoalesceExpr);

	COPY_SCALAR_FIELD(coalescetype);
	COPY_NODE_FIELD(args);

	return newnode;
}

/*
 * _copyMinMaxExpr
 */
static MinMaxExpr *
_copyMinMaxExpr(MinMaxExpr *from)
{
	MinMaxExpr *newnode = makeNode(MinMaxExpr);

	COPY_SCALAR_FIELD(minmaxtype);
	COPY_SCALAR_FIELD(op);
	COPY_NODE_FIELD(args);

	return newnode;
}

/*
 * _copyNullIfExpr (same as OpExpr)
 */
static NullIfExpr *
_copyNullIfExpr(NullIfExpr *from)
{
	NullIfExpr *newnode = makeNode(NullIfExpr);

	COPY_SCALAR_FIELD(opno);
	COPY_SCALAR_FIELD(opfuncid);
	COPY_SCALAR_FIELD(opresulttype);
	COPY_SCALAR_FIELD(opretset);
	COPY_NODE_FIELD(args);

	return newnode;
}

/*
 * _copyNullTest
 */
static NullTest *
_copyNullTest(NullTest *from)
{
	NullTest   *newnode = makeNode(NullTest);

	COPY_NODE_FIELD(arg);
	COPY_SCALAR_FIELD(nulltesttype);

	return newnode;
}

/*
 * _copyBooleanTest
 */
static BooleanTest *
_copyBooleanTest(BooleanTest *from)
{
	BooleanTest *newnode = makeNode(BooleanTest);

	COPY_NODE_FIELD(arg);
	COPY_SCALAR_FIELD(booltesttype);

	return newnode;
}

/*
 * _copyCoerceToDomain
 */
static CoerceToDomain *
_copyCoerceToDomain(CoerceToDomain *from)
{
	CoerceToDomain *newnode = makeNode(CoerceToDomain);

	COPY_NODE_FIELD(arg);
	COPY_SCALAR_FIELD(resulttype);
	COPY_SCALAR_FIELD(resulttypmod);
	COPY_SCALAR_FIELD(coercionformat);

	return newnode;
}

/*
 * _copyCoerceToDomainValue
 */
static CoerceToDomainValue *
_copyCoerceToDomainValue(CoerceToDomainValue *from)
{
	CoerceToDomainValue *newnode = makeNode(CoerceToDomainValue);

	COPY_SCALAR_FIELD(typeId);
	COPY_SCALAR_FIELD(typeMod);

	return newnode;
}

/*
 * _copySetToDefault
 */
static SetToDefault *
_copySetToDefault(SetToDefault *from)
{
	SetToDefault *newnode = makeNode(SetToDefault);

	COPY_SCALAR_FIELD(typeId);
	COPY_SCALAR_FIELD(typeMod);

	return newnode;
}

/*
 * _copyTargetEntry
 */
static TargetEntry *
_copyTargetEntry(TargetEntry *from)
{
	TargetEntry *newnode = makeNode(TargetEntry);

	COPY_NODE_FIELD(expr);
	COPY_SCALAR_FIELD(resno);
	COPY_STRING_FIELD(resname);
	COPY_SCALAR_FIELD(ressortgroupref);
	COPY_SCALAR_FIELD(resorigtbl);
	COPY_SCALAR_FIELD(resorigcol);
	COPY_SCALAR_FIELD(resjunk);

	return newnode;
}

/*
 * _copyRangeTblRef
 */
static RangeTblRef *
_copyRangeTblRef(RangeTblRef *from)
{
	RangeTblRef *newnode = makeNode(RangeTblRef);

	COPY_SCALAR_FIELD(rtindex);

	return newnode;
}

/*
 * _copyJoinExpr
 */
static JoinExpr *
_copyJoinExpr(JoinExpr *from)
{
	JoinExpr   *newnode = makeNode(JoinExpr);

	COPY_SCALAR_FIELD(jointype);
	COPY_SCALAR_FIELD(isNatural);
	COPY_NODE_FIELD(larg);
	COPY_NODE_FIELD(rarg);
	COPY_NODE_FIELD(using);
	COPY_NODE_FIELD(quals);
	COPY_NODE_FIELD(alias);
	COPY_SCALAR_FIELD(rtindex);

	return newnode;
}

/*
 * _copyFromExpr
 */
static FromExpr *
_copyFromExpr(FromExpr *from)
{
	FromExpr   *newnode = makeNode(FromExpr);

	COPY_NODE_FIELD(fromlist);
	COPY_NODE_FIELD(quals);

	return newnode;
}

/* ****************************************************************
 *						relation.h copy functions
 *
 * We don't support copying RelOptInfo, IndexOptInfo, or Path nodes.
 * There are some subsidiary structs that are useful to copy, though.
 * ****************************************************************
 */

/*
 * _copyPathKeyItem
 */
static PathKeyItem *
_copyPathKeyItem(PathKeyItem *from)
{
	PathKeyItem *newnode = makeNode(PathKeyItem);

	COPY_NODE_FIELD(key);
	COPY_SCALAR_FIELD(sortop);

	return newnode;
}

/*
 * _copyRestrictInfo
 */
static RestrictInfo *
_copyRestrictInfo(RestrictInfo *from)
{
	RestrictInfo *newnode = makeNode(RestrictInfo);

	COPY_NODE_FIELD(clause);
	COPY_SCALAR_FIELD(is_pushed_down);
	COPY_SCALAR_FIELD(outerjoin_delayed);
	COPY_SCALAR_FIELD(can_join);
	COPY_BITMAPSET_FIELD(clause_relids);
	COPY_BITMAPSET_FIELD(required_relids);
	COPY_BITMAPSET_FIELD(left_relids);
	COPY_BITMAPSET_FIELD(right_relids);
	COPY_NODE_FIELD(orclause);
	COPY_SCALAR_FIELD(eval_cost);
	COPY_SCALAR_FIELD(this_selec);
	COPY_SCALAR_FIELD(mergejoinoperator);
	COPY_SCALAR_FIELD(left_sortop);
	COPY_SCALAR_FIELD(right_sortop);

	/*
	 * Do not copy pathkeys, since they'd not be canonical in a copied query
	 */
	newnode->left_pathkey = NIL;
	newnode->right_pathkey = NIL;

	COPY_SCALAR_FIELD(left_mergescansel);
	COPY_SCALAR_FIELD(right_mergescansel);
	COPY_SCALAR_FIELD(hashjoinoperator);
	COPY_SCALAR_FIELD(left_bucketsize);
	COPY_SCALAR_FIELD(right_bucketsize);

	return newnode;
}

/*
 * _copyInClauseInfo
 */
static InClauseInfo *
_copyInClauseInfo(InClauseInfo *from)
{
	InClauseInfo *newnode = makeNode(InClauseInfo);

	COPY_BITMAPSET_FIELD(lefthand);
	COPY_BITMAPSET_FIELD(righthand);
	COPY_NODE_FIELD(sub_targetlist);

	return newnode;