Function copy_pathtarget

src/backend/optimizer/util/tlist.c:888–906

* copy_pathtarget * Copy a PathTarget. * * The new PathTarget has its own exprs List, but shares the underlying * target expression trees with the old one. */

 * target expression trees with the old one.
 */
PathTarget *
copy_pathtarget(PathTarget *src)
{
	PathTarget *dst = makeNode(PathTarget);

	/* Copy scalar fields */
	memcpy(dst, src, sizeof(PathTarget));
	/* Shallow-copy the expression list */
	dst->exprs = list_copy(src->exprs);
	/* Duplicate sortgrouprefs if any (if not, the memcpy handled this) */
	if (src->sortgrouprefs)
	{
		Size		nbytes = list_length(src->exprs) * sizeof(Index);

		dst->sortgrouprefs = (Index *) palloc(nbytes);
		memcpy(dst->sortgrouprefs, src->sortgrouprefs, nbytes);
	}
	return dst;
}

/*
 * create_empty_pathtarget