presto-main/src/main/java/io/prestosql/sql/relational/SqlToRowExpressionTranslator.java/SqlToRowExpressionTranslator/changeType
class SqlToRowExpressionTranslator:        private static RowExpression changeType(RowExpression value, Type targetType)
        {
            ChangeTypeVisitor visitor = new ChangeTypeVisitor(targetType);
            return value.accept(visitor, null);
        }