presto-main/src/main/java/io/prestosql/execution/QueryStateMachine.java/QueryStateMachine/addPreparedStatement
class QueryStateMachine:    public void addPreparedStatement(String key, String value)
    {
        requireNonNull(key, "key is null");
        requireNonNull(value, "value is null");

        addedPreparedStatements.put(key, value);
    }