presto-parser/src/main/java/io/prestosql/sql/tree/CharLiteral.java/CharLiteral/CharLiteral
class CharLiteral:    public CharLiteral(Optional<NodeLocation> location, String value)
    {
        super(location);
        requireNonNull(value, "value is null");
        this.value = value;
        this.slice = utf8Slice(CharMatcher.is(' ').trimTrailingFrom(value));
    }