Function _collect_aliases_in_path

src/ast/ast_shared.c:234–280

}

static void _collect_aliases_in_path
(
	const cypher_astnode_t *path,
	rax *identifiers
) {
	// collect path name if, if exists
	if(cypher_astnode_type(path) == CYPHER_AST_NAMED_PATH) {
		const cypher_astnode_t *ast_alias =
			cypher_ast_named_path_get_identifier(path);
		if(ast_alias != NULL) {
			const char *identifier = cypher_ast_identifier_get_name(ast_alias);
			raxTryInsert(identifiers, (unsigned char *)identifier,
				strlen(identifier), (void *)ast_alias, NULL);
		}
	}

	uint path_len = cypher_ast_pattern_path_nelements(path);
	// every even offset corresponds to a node
	for(uint i = 0; i < path_len; i += 2) {
		const cypher_astnode_t *ast_node =
			cypher_ast_pattern_path_get_element(path, i);
		const cypher_astnode_t *ast_alias =
			cypher_ast_node_pattern_get_identifier(ast_node);

		if(ast_alias == NULL) continue;  // unaliased node, do nothing

		// add node alias to projection rax
		const char *identifier = cypher_ast_identifier_get_name(ast_alias);
		raxTryInsert(identifiers, (unsigned char *)identifier,
			strlen(identifier), (void *)ast_alias, NULL);
	}

	// every odd offset corresponds to an edge
	for(uint i = 1; i < path_len; i += 2) {
		const cypher_astnode_t *ast_edge =
			cypher_ast_pattern_path_get_element(path, i);
		const cypher_astnode_t *ast_alias =
			cypher_ast_rel_pattern_get_identifier(ast_edge);

		if(ast_alias == NULL) continue;  // unaliased edge, do nothing

		// add edge alias to projection rax
		const char *identifier = cypher_ast_identifier_get_name(ast_alias);
		raxTryInsert(identifiers, (unsigned char *)identifier,
			strlen(identifier), (void *)ast_alias, NULL);
	}
}

static void _collect_aliases_in_pattern
(