Function copy_byval_expanded_array

src/backend/utils/adt/array_expanded.c:184–227

* helper for expand_array(): copy pass-by-value Datum-array representation */

 * helper for expand_array(): copy pass-by-value Datum-array representation
 */
static void
copy_byval_expanded_array(ExpandedArrayHeader *eah,
						  ExpandedArrayHeader *oldeah)
{
	MemoryContext objcxt = eah->hdr.eoh_context;
	int			ndims = oldeah->ndims;
	int			dvalueslen = oldeah->dvalueslen;

	/* Copy array dimensionality information */
	eah->ndims = ndims;
	/* We can alloc both dimensionality arrays with one palloc */
	eah->dims = (int *) MemoryContextAlloc(objcxt, ndims * 2 * sizeof(int));
	eah->lbound = eah->dims + ndims;
	/* .. but don't assume the source's arrays are contiguous */
	memcpy(eah->dims, oldeah->dims, ndims * sizeof(int));
	memcpy(eah->lbound, oldeah->lbound, ndims * sizeof(int));

	/* Copy element-type data */
	eah->element_type = oldeah->element_type;
	eah->typlen = oldeah->typlen;
	eah->typbyval = oldeah->typbyval;
	eah->typalign = oldeah->typalign;

	/* Copy the deconstructed representation */
	eah->dvalues = (Datum *) MemoryContextAlloc(objcxt,
												dvalueslen * sizeof(Datum));
	memcpy(eah->dvalues, oldeah->dvalues, dvalueslen * sizeof(Datum));
	if (oldeah->dnulls)
	{
		eah->dnulls = (bool *) MemoryContextAlloc(objcxt,
												  dvalueslen * sizeof(bool));
		memcpy(eah->dnulls, oldeah->dnulls, dvalueslen * sizeof(bool));
	}
	else
		eah->dnulls = NULL;
	eah->dvalueslen = dvalueslen;
	eah->nelems = oldeah->nelems;
	eah->flat_size = oldeah->flat_size;

	/* we don't make a flat representation */
	eah->fvalue = NULL;
	eah->fstartptr = NULL;
	eah->fendptr = NULL;
}

/*
 * get_flat_size method for expanded arrays