Function SQE_field

src/gpre/sqe.cpp:338–679

//

gpre_nod* SQE_field(gpre_req* request, bool aster_ok)
{
	gpre_req* slice_req;

	assert_IS_REQ(request);

	gpre_lls* upper_dim = NULL;
	gpre_lls* lower_dim = NULL;
	tok hold_token;
	hold_token.tok_type = tok_t(0);

	if (aster_ok && MSC_match(KW_ASTERISK))
	{
		gpre_nod* node = MSC_node(nod_asterisk, 1);
		return node;
	}

	// if the token isn't an identifier, complain

	SQL_resolve_identifier("<column name>", NULL, NAME_SIZE);

	// For domains we can't be resolving tokens to field names
	// in the CHECK constraint.

	TEXT s[ERROR_LENGTH];

	act* action;
	if (request && request->req_type == REQ_ddl && (action = request->req_actions) &&
		(action->act_type == ACT_create_domain || action->act_type == ACT_alter_domain))
	{
		fb_utils::snprintf(s, sizeof(s), "Illegal use of identifier: %s in domain constraint",
				gpreGlob.token_global.tok_string);
		PAR_error(s);
	}


	// Note: We *always* want to make a deferred name block - to handle
	// scoping of alias names in subselects properly, when we haven't
	// seen the list of relations (& aliases for them).  This occurs
	// during the select list, but by the time we see the having, group,
	// order, or where we do know all aliases and should be able to
	// precisely match.
	// Note that the case of request == NULL should never
	// occur, and request->req_contexts == NULL should only
	// occur for the very first select list in a request.
	// 1994-October-03 David Schnepper

	// if the request is null, make a deferred name block

	if (!request || !request->req_contexts || request->req_in_select_list)
	{
		gpre_nod* node = MSC_node(nod_deferred, 3);
		node->nod_count = 0;
		tok* f_token = (tok*) MSC_alloc(TOK_LEN);
		node->nod_arg[0] = (gpre_nod*) f_token;
		f_token->tok_length = gpreGlob.token_global.tok_length;
		SQL_resolve_identifier("<identifier>", f_token->tok_string, f_token->tok_length + 1);
		CPR_token();