presto-plugin-toolkit/src/main/java/io/prestosql/plugin/base/security/FileBasedAccessControl.java/FileBasedAccessControl/isSchemaOwner
class FileBasedAccessControl:    private boolean isSchemaOwner(ConnectorSecurityContext context, String schemaName)
    {
        for (SchemaAccessControlRule rule : schemaRules) {
            Optional<Boolean> owner = rule.match(context.getIdentity().getUser(), schemaName);
            if (owner.isPresent()) {
                return owner.get();
            }
        }
        return false;
    }