Function _collect_call_subquery_projections

src/ast/ast_shared.c:349–386

collect aliases from a CALL {} clause

// collect aliases from a CALL {} clause
static void _collect_call_subquery_projections
(
	const cypher_astnode_t *clause,
	rax *identifiers
) {
	// collect returned aliases from the subquery, if there are any
	const cypher_astnode_t *query =
		cypher_ast_call_subquery_get_query(clause);
	uint nclauses = cypher_ast_query_nclauses(query);
	const cypher_astnode_t *last_clause =
		cypher_ast_query_get_clause(query, nclauses - 1);
	bool is_returning = (cypher_astnode_type(last_clause) == CYPHER_AST_RETURN);
	if(!is_returning) {
		return;
	}

	// collect aliases from the RETURN clause
	uint projection_count = cypher_ast_return_nprojections(last_clause);
	for(uint i = 0; i < projection_count; i ++) {
		const cypher_astnode_t *projection =
			cypher_ast_return_get_projection(last_clause, i);
		const cypher_astnode_t *identifier_node =
			cypher_ast_projection_get_alias(projection);
		if(identifier_node == NULL) {
			// the projection was not aliased
			// so the projection itself must be an identifier
			identifier_node = cypher_ast_projection_get_expression(projection);
			ASSERT(cypher_astnode_type(identifier_node) == CYPHER_AST_IDENTIFIER);
		} else {
			// do not include empty projections, which may have been made to
			// handle the MATCH () WITH * case
			if(!strcmp(cypher_ast_identifier_get_name(identifier_node), "")) continue;
		}
		const char *identifier = cypher_ast_identifier_get_name(identifier_node);
		raxTryInsert(identifiers, (unsigned char *)identifier,
			strlen(identifier), (void *)identifier_node, NULL);
	}
}

// collect aliases defined in a scope bounded by scope_start and scope_end
void collect_aliases_in_scope