Function PAR_sort_internal

src/jrd/par.cpp:1519–1564

Parse the internals of a sort clause. This is used for blr_sort, blr_project, blr_group_by and blr_partition_by.

// Parse the internals of a sort clause. This is used for blr_sort, blr_project, blr_group_by
// and blr_partition_by.
SortNode* PAR_sort_internal(thread_db* tdbb, CompilerScratch* csb, bool allClauses, USHORT count)
{
	SET_TDBB(tdbb);

	SortNode* sort = FB_NEW_POOL(*tdbb->getDefaultPool()) SortNode(
		*tdbb->getDefaultPool());

	NestConst<ValueExprNode>* ptr = sort->expressions.getBuffer(count);
	SortDirection* ptr2 = sort->direction.getBuffer(count);
	NullsPlacement* ptr3 = sort->nullOrder.getBuffer(count);

	while (count-- > 0)
	{
		if (allClauses)
		{
			UCHAR code = csb->csb_blr_reader.getByte();

			switch (code)
			{
				case blr_nullsfirst:
					*ptr3++ = NULLS_FIRST;
					code = csb->csb_blr_reader.getByte();
					break;

				case blr_nullslast:
					*ptr3++ = NULLS_LAST;
					code = csb->csb_blr_reader.getByte();
					break;

				default:
					*ptr3++ = NULLS_DEFAULT;
			}

			*ptr2++ = (code == blr_descending) ? ORDER_DESC : ORDER_ASC;
		}
		else
		{
			*ptr2++ = ORDER_ANY;
			*ptr3++ = NULLS_DEFAULT;
		}

		*ptr++ = PAR_parse_value(tdbb, csb);
	}

	return sort;
}


// Parse a boolean node.