Function AST_ReadOnly

src/ast/ast.c:149–187

}

bool AST_ReadOnly
(
	const cypher_astnode_t *root
) {
	// check for empty query
	if(root == NULL) return true;

	cypher_astnode_type_t type = cypher_astnode_type(root);
	if(type == CYPHER_AST_CREATE                     ||
	   type == CYPHER_AST_MERGE                      ||
	   type == CYPHER_AST_DELETE                     ||
	   type == CYPHER_AST_SET                        ||
	   type == CYPHER_AST_REMOVE                     ||
	   type == CYPHER_AST_CREATE_NODE_PROPS_INDEX    ||
	   type == CYPHER_AST_CREATE_PATTERN_PROPS_INDEX ||
	   type == CYPHER_AST_DROP_PROPS_INDEX) {
		return false;
	}

	// in case of procedure call which modifies the graph/indices
	if(type == CYPHER_AST_CALL) {
		const char *proc_name = cypher_ast_proc_name_get_value(
									cypher_ast_call_get_proc_name(root));

		ProcedureCtx *proc = Proc_Get(proc_name);
		bool read_only = Procedure_IsReadOnly(proc);
		Proc_Free(proc);

		if(!read_only) return false;
	}

	uint num_children = cypher_astnode_nchildren(root);
	for(uint i = 0; i < num_children; i ++) {
		const cypher_astnode_t *child = cypher_astnode_get_child(root, i);
		if(!AST_ReadOnly(child)) return false;
	}

	return true;
}

// returns true if the given ast-node will result in an eager operation
static bool _clause_is_eager