Function PAR_sort

src/jrd/par.cpp:1489–1514

Parse a sort clause (sans header byte). This is used for blr_sort, blr_project and blr_group_by.

// Parse a sort clause (sans header byte). This is used for blr_sort, blr_project and blr_group_by.
SortNode* PAR_sort(thread_db* tdbb, CompilerScratch* csb, UCHAR expectedBlr,
	bool nullForEmpty)
{
	SET_TDBB(tdbb);

	const UCHAR blrOp = csb->csb_blr_reader.getByte();

	if (blrOp != expectedBlr)
	{
		char s[20];
		sprintf(s, "blr code %d", expectedBlr);
		PAR_syntax_error(csb, s);
	}

	USHORT count = csb->csb_blr_reader.getByte();

	if (count == 0 && nullForEmpty)
		return NULL;

	SortNode* sort = PAR_sort_internal(tdbb, csb, blrOp == blr_sort, count);

	if (blrOp != blr_sort)
		sort->unique = true;

	return sort;
}


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