copyfuncs.c

关系型数据库 Postgresql 6.5.2

	/* ----------------
	 *	copy remainder of node
	 * ----------------
	 */
	Node_Copy(from, newnode, path_hashclauses);
	Node_Copy(from, newnode, outerhashkeys);
	Node_Copy(from, newnode, innerhashkeys);

	return newnode;
}

/* ----------------
 *		_copyOrderKey
 * ----------------
 */
static OrderKey *
_copyOrderKey(OrderKey *from)
{
	OrderKey   *newnode = makeNode(OrderKey);

	/* ----------------
	 *	copy remainder of node
	 * ----------------
	 */
	newnode->attribute_number = from->attribute_number;
	newnode->array_index = from->array_index;

	return newnode;
}


/* ----------------
 *		_copyJoinKey
 * ----------------
 */
static JoinKey *
_copyJoinKey(JoinKey *from)
{
	JoinKey    *newnode = makeNode(JoinKey);

	/* ----------------
	 *	copy remainder of node
	 * ----------------
	 */
	Node_Copy(from, newnode, outer);
	Node_Copy(from, newnode, inner);

	return newnode;
}

/* ----------------
 *		_copyMergeOrder
 * ----------------
 */
static MergeOrder *
_copyMergeOrder(MergeOrder *from)
{
	MergeOrder *newnode = makeNode(MergeOrder);

	/* ----------------
	 *	copy remainder of node
	 * ----------------
	 */
	newnode->join_operator = from->join_operator;
	newnode->left_operator = from->left_operator;
	newnode->right_operator = from->right_operator;
	newnode->left_type = from->left_type;
	newnode->right_type = from->right_type;

	return newnode;
}

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

	/* ----------------
	 *	copy remainder of node
	 * ----------------
	 */
	Node_Copy(from, newnode, clause);

	newnode->selectivity = from->selectivity;
	newnode->notclause = from->notclause;

	Node_Copy(from, newnode, indexids);
	Node_Copy(from, newnode, mergejoinorder);
	newnode->hashjoinoperator = from->hashjoinoperator;
	newnode->restrictinfojoinid = listCopy(from->restrictinfojoinid);

	return newnode;
}

/* ----------------
 *		CopyJoinMethodFields
 *
 *		This function copies the fields of the JoinMethod node.  It is used by
 *		all the copy functions for classes which inherit from JoinMethod.
 * ----------------
 */
static void
CopyJoinMethodFields(JoinMethod *from, JoinMethod *newnode)
{
	Node_Copy(from, newnode, jmkeys);
	Node_Copy(from, newnode, clauses);
	return;
}

/* ----------------
 *		_copyJoinMethod
 * ----------------
 */
static JoinMethod *
_copyJoinMethod(JoinMethod *from)
{
	JoinMethod *newnode = makeNode(JoinMethod);

	CopyJoinMethodFields(from, newnode);

	return newnode;
}

/* ----------------
 *		_copyHashInfo
 * ----------------
 */
static HashInfo *
_copyHashInfo(HashInfo *from)
{
	HashInfo   *newnode = makeNode(HashInfo);

	/* ----------------
	 *	copy remainder of node
	 * ----------------
	 */
	CopyJoinMethodFields((JoinMethod *) from, (JoinMethod *) newnode);
	newnode->hashop = from->hashop;

	return newnode;
}

/* ----------------
 *		_copyMergeInfo
 * ----------------
 */
static MergeInfo *
_copyMergeInfo(MergeInfo *from)
{
	MergeInfo  *newnode = makeNode(MergeInfo);

	/* ----------------
	 *	copy remainder of node
	 * ----------------
	 */
	CopyJoinMethodFields((JoinMethod *) from, (JoinMethod *) newnode);
	Node_Copy(from, newnode, m_ordering);

	return newnode;
}

/* ----------------
 *		_copyJoinInfo
 * ----------------
 */
static JoinInfo *
_copyJoinInfo(JoinInfo *from)
{
	JoinInfo   *newnode = makeNode(JoinInfo);

	/* ----------------
	 *	copy remainder of node
	 * ----------------
	 */
	newnode->unjoined_relids = listCopy(from->unjoined_relids);
	Node_Copy(from, newnode, jinfo_restrictinfo);

	newnode->mergejoinable = from->mergejoinable;
	newnode->hashjoinable = from->hashjoinable;

	return newnode;
}

static Iter *
_copyIter(Iter *from)
{
	Iter	   *newnode = makeNode(Iter);

	Node_Copy(from, newnode, iterexpr);
	newnode->itertype = from->itertype;

	return newnode;
}

static Stream *
_copyStream(Stream *from)
{
	Stream	   *newnode = makeNode(Stream);

	newnode->pathptr = from->pathptr;
	newnode->cinfo = from->cinfo;
	newnode->clausetype = from->clausetype;

	newnode->upstream = (StreamPtr) NULL;		/* only copy nodes
												 * downwards! */
	Node_Copy(from, newnode, downstream);
	if (newnode->downstream)
		((Stream *) newnode->downstream)->upstream = (Stream *) newnode;

	newnode->groupup = from->groupup;
	newnode->groupcost = from->groupcost;
	newnode->groupsel = from->groupsel;

	return newnode;
}

/*
 *	parsenodes.h routines have no copy functions
 */

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

	Node_Copy(from, newnode, resdom);
	Node_Copy(from, newnode, fjoin);
	Node_Copy(from, newnode, expr);
	return newnode;
}

static RangeTblEntry *
_copyRangeTblEntry(RangeTblEntry *from)
{
	RangeTblEntry *newnode = makeNode(RangeTblEntry);

	if (from->relname)
		newnode->relname = pstrdup(from->relname);
	if (from->refname)
		newnode->refname = pstrdup(from->refname);
	newnode->relid = from->relid;
	newnode->inh = from->inh;
	newnode->inFromCl = from->inFromCl;
	newnode->skipAcl = from->skipAcl;


	return newnode;
}

static RowMark *
_copyRowMark(RowMark *from)
{
	RowMark    *newnode = makeNode(RowMark);

	newnode->rti = from->rti;
	newnode->info = from->info;

	return newnode;
}

static SortClause *
_copySortClause(SortClause *from)
{
	SortClause *newnode = makeNode(SortClause);

	Node_Copy(from, newnode, resdom);
	newnode->opoid = from->opoid;

	return newnode;
}

static A_Const *
_copyAConst(A_Const *from)
{
	A_Const    *newnode = makeNode(A_Const);

	newnode->val = *((Value *) (copyObject(&(from->val))));
	Node_Copy(from, newnode, typename);

	return newnode;
}

static TypeName *
_copyTypeName(TypeName *from)
{
	TypeName   *newnode = makeNode(TypeName);

	if (from->name)
		newnode->name = pstrdup(from->name);
	newnode->timezone = from->timezone;
	newnode->setof = from->setof;
	newnode->typmod = from->typmod;
	Node_Copy(from, newnode, arrayBounds);

	return newnode;
}

static Query *
_copyQuery(Query *from)
{
	Query	   *newnode = makeNode(Query);

	newnode->commandType = from->commandType;
	if (from->utilityStmt && nodeTag(from->utilityStmt) == T_NotifyStmt)
	{
		NotifyStmt *from_notify = (NotifyStmt *) from->utilityStmt;
		NotifyStmt *n = makeNode(NotifyStmt);

		n->relname = pstrdup(from_notify->relname);
		newnode->utilityStmt = (Node *) n;
	}
	newnode->resultRelation = from->resultRelation;
	if (from->into)
		newnode->into = pstrdup(from->into);
	newnode->isPortal = from->isPortal;
	newnode->isBinary = from->isBinary;
	newnode->isTemp = from->isTemp;
	newnode->unionall = from->unionall;
	if (from->uniqueFlag)
		newnode->uniqueFlag = pstrdup(from->uniqueFlag);
	Node_Copy(from, newnode, sortClause);
	Node_Copy(from, newnode, rtable);
	Node_Copy(from, newnode, targetList);
	Node_Copy(from, newnode, qual);

	Node_Copy(from, newnode, groupClause);
	Node_Copy(from, newnode, havingQual);

	newnode->hasAggs = from->hasAggs;
	newnode->hasSubLinks = from->hasSubLinks;

	if (from->unionClause)
	{
		List	   *ulist,
				   *temp_list = NIL;

		foreach(ulist, from->unionClause)
			temp_list = lappend(temp_list, copyObject(lfirst(ulist)));
		newnode->unionClause = temp_list;
	}

	Node_Copy(from, newnode, limitOffset);
	Node_Copy(from, newnode, limitCount);

	Node_Copy(from, newnode, rowMark);

	return newnode;
}


/*
 *	mnodes.h routines have no copy functions
 */

/* ****************************************************************
 *					pg_list.h copy functions
 * ****************************************************************
 */

static Value *
_copyValue(Value *from)
{
	Value	   *newnode = makeNode(Value);

	newnode->type = from->type;
	switch (from->type)
	{
		case T_String:
			newnode->val.str = pstrdup(from->val.str);
			break;
		case T_Integer:
			newnode->val.ival = from->val.ival;
			break;
		case T_Float:
			newnode->val.dval = from->val.dval;
			break;
		default:
			break;
	}
	return newnode;
}

/* ----------------
 *		copyObject returns a copy of the node or list. If it is a list, it
 *		recursively copies its items.
 * ----------------
 */
void *
copyObject(void *from)
{
	void	   *retval;

	if (from == NULL)
		return NULL;
	switch (nodeTag(from))
	{

			/*
			 * PLAN NODES
			 */
		case T_Plan:
			retval = _copyPlan(from);
			break;
		case T_Result:
			retval = _copyResult(from);
			break;
		case T_Append:
			retval = _copyAppend(from);
			break;
		case T_Scan:
			retval = _copyScan(from);
			break;
		case T_SeqScan:
			retval = _copySeqScan(from);
			break;
		case T_IndexScan:
			retval = _copyIndexScan(from);
			break;
		case T_Join:
			retval = _copyJoin(from);
			break;
		case T_NestLoop:
			retval = _copyNestLoop(from);
			break;
		case T_MergeJoin:
			retval = _copyMergeJoin(from);
			break;
		case T_HashJoin:
			retval = _copyHashJoin(from);
			break;
		case T_Noname:
			retval = _copyNoname(from);
			break;
		case T_Material:
			retval = _copyMaterial(from);
			break;
		case T_Sort:
			retval = _copySort(from);
			break;
		case T_Group:
			retval = _copyGroup(from);
			break;
		case T_Agg:
			retval = _copyAgg(from);
			break;
		case T_GroupClause:
			retval = _copyGroupClause(from);
			break;
		case T_Unique:
			retval = _copyUnique(from);
			break;
		case T_Hash:
			retval = _copyHash(from);
			break;
		case T_SubPlan:
			retval = _copySubPlan(from);
			break;

			/*
			 * PRIMITIVE NODES
			 */
		case T_Resdom:
			retval = _copyResdom(from);
			break;
		case T_Fjoin:
			retval = _copyFjoin(from);
			break;
		case T_Expr:
			retval = _copyExpr(from);
			break;
		case T_Var:
			retval = _copyVar(from);
			break;
		case T_Oper:
			retval = _copyOper(from);
			break;
		case T_Const:
			retval = _copyConst(from);
			break;
		case T_Param:
			retval = _copyParam(from);
			break;
		case T_Func:
			retval = _copyFunc(from);
			break;
		case T_Array:
			retval = _copyArray(from);
			break;
		case T_ArrayRef:
			retval = _copyArrayRef(from);
			break;
		case T_Aggref:
			retval = _copyAggref(from);
			break;
		case T_SubLink:
			retval = _copySubLink(from);
			break;
		case T_CaseExpr:
			retval = _copyCaseExpr(from);
			break;
		case T_CaseWhen:
			retval = _copyCaseWhen(from);
			break;

			/*
			 * RELATION NODES
			 */
		case T_RelOptInfo:
			retval = _copyRelOptInfo(from);
			break;
		case T_Path:
			retval = _copyPath(from);
			break;
		case T_IndexPath:
			retval = _copyIndexPath(from);
			break;
		case T_NestPath:
			retval = _copyNestPath(from);
			break;
		case T_MergePath:
			retval = _copyMergePath(from);
			break;
		case T_HashPath:
			retval = _copyHashPath(from);
			break;
		case T_OrderKey:
			retval = _copyOrderKey(from);
			break;
		case T_JoinKey:
			retval = _copyJoinKey(from);
			break;
		case T_MergeOrder:
			retval = _copyMergeOrder(from);
			break;
		case T_RestrictInfo:
			retval = _copyRestrictInfo(from);
			break;
		case T_JoinMethod:
			retval = _copyJoinMethod(from);
			break;
		case T_HashInfo:
			retval = _copyHashInfo(from);
			break;
		case T_MergeInfo:
			retval = _copyMergeInfo(from);
			break;
		case T_JoinInfo:
			retval = _copyJoinInfo(from);
			break;
		case T_Iter:
			retval = _copyIter(from);
			break;
		case T_Stream:
			retval = _copyStream(from);
			break;

			/*
			 * PARSE NODES
			 */
		case T_Query:
			retval = _copyQuery(from);
			break;
		case T_TargetEntry:
			retval = _copyTargetEntry(from);
			break;
		case T_RangeTblEntry:
			retval = _copyRangeTblEntry(from);
			break;
		case T_RowMark:
			retval = _copyRowMark(from);
			break;
		case T_SortClause:
			retval = _copySortClause(from);
			break;
		case T_A_Const:
			retval = _copyAConst(from);
			break;
		case T_TypeName:
			retval = _copyTypeName(from);
			break;

			/*
			 * VALUE NODES
			 */
		case T_Integer:
		case T_String:
		case T_Float:
			retval = _copyValue(from);
			break;
		case T_List:
			{
				List	   *list = from,
						   *l;
				List	   *newlist = NIL,
						   *nl = NIL;

				foreach(l, list)
				{
					if (newlist == NIL)
						newlist = nl = lcons(copyObject(lfirst(l)), NIL);
					else
					{
						lnext(nl) = lcons(copyObject(lfirst(l)), NIL);
						nl = lnext(nl);
					}
				}
				retval = newlist;
			}
			break;
		default:
			elog(ERROR, "copyObject: don't know how to copy %d", nodeTag(from));
			retval = from;
			break;
	}
	return retval;
}