presto-main/src/main/java/io/prestosql/type/TypeCoercion.java/TypeCoercion/coerceTypeBase
class TypeCoercion:    @SuppressWarnings("SwitchStatementWithTooFewBranches")
    public Optional<Type> coerceTypeBase(Type sourceType, String resultTypeBase)
    {
        String sourceTypeName = sourceType.getBaseName();
        if (sourceTypeName.equals(resultTypeBase)) {
            return Optional.of(sourceType);
        }

        switch (sourceTypeName) {
            case UnknownType.NAME: {
                switch (resultTypeBase) {
                    case StandardTypes.BOOLEAN:
                    case StandardTypes.BIGINT:
                    case StandardTypes.INTEGER:
                    case StandardTypes.DOUBLE:
                    case StandardTypes.REAL:
                    case StandardTypes.VARBINARY:
                    case StandardTypes.DATE:
                    case StandardTypes.TIME:
                    case StandardTypes.TIME_WITH_TIME_ZONE:
                    case StandardTypes.TIMESTAMP:
                    case StandardTypes.TIMESTAMP_WITH_TIME_ZONE:
                    case StandardTypes.HYPER_LOG_LOG:
                    case SetDigestType.NAME:
                    case StandardTypes.P4_HYPER_LOG_LOG:
                    case StandardTypes.JSON:
                    case StandardTypes.INTERVAL_YEAR_TO_MONTH:
                    case StandardTypes.INTERVAL_DAY_TO_SECOND:
                    case JoniRegexpType.NAME:
                    case JsonPathType.NAME:
                    case ColorType.NAME:
                    case CodePointsType.NAME:
                        return Optional.of(lookupType.apply(new TypeSignature(resultTypeBase)));
                    case StandardTypes.VARCHAR:
                        return Optional.of(createVarcharType(0));
                    case StandardTypes.CHAR:
                        return Optional.of(createCharType(0));
                    case StandardTypes.DECIMAL:
                        return Optional.of(createDecimalType(1, 0));
                    default:
                        return Optional.empty();
                }
            }
            case StandardTypes.TINYINT: {
                switch (resultTypeBase) {
                    case StandardTypes.SMALLINT:
                        return Optional.of(SMALLINT);
                    case StandardTypes.INTEGER:
                        return Optional.of(INTEGER);
                    case StandardTypes.BIGINT:
                        return Optional.of(BIGINT);
                    case StandardTypes.REAL:
                        return Optional.of(REAL);
                    case StandardTypes.DOUBLE:
                        return Optional.of(DOUBLE);
                    case StandardTypes.DECIMAL:
                        return Optional.of(createDecimalType(3, 0));
                    default:
                        return Optional.empty();
                }
            }
            case StandardTypes.SMALLINT: {
                switch (resultTypeBase) {
                    case StandardTypes.INTEGER:
                        return Optional.of(INTEGER);
                    case StandardTypes.BIGINT:
                        return Optional.of(BIGINT);
                    case StandardTypes.REAL:
                        return Optional.of(REAL);
                    case StandardTypes.DOUBLE:
                        return Optional.of(DOUBLE);
                    case StandardTypes.DECIMAL:
                        return Optional.of(createDecimalType(5, 0));
                    default:
                        return Optional.empty();
                }
            }
            case StandardTypes.INTEGER: {
                switch (resultTypeBase) {
                    case StandardTypes.BIGINT:
                        return Optional.of(BIGINT);
                    case StandardTypes.REAL:
                        return Optional.of(REAL);
                    case StandardTypes.DOUBLE:
                        return Optional.of(DOUBLE);
                    case StandardTypes.DECIMAL:
                        return Optional.of(createDecimalType(10, 0));
                    default:
                        return Optional.empty();
                }
            }
            case StandardTypes.BIGINT: {
                switch (resultTypeBase) {
                    case StandardTypes.REAL:
                        return Optional.of(REAL);
                    case StandardTypes.DOUBLE:
                        return Optional.of(DOUBLE);
                    case StandardTypes.DECIMAL:
                        return Optional.of(createDecimalType(19, 0));
                    default:
                        return Optional.empty();
                }
            }
            case StandardTypes.DECIMAL: {
                switch (resultTypeBase) {
                    case StandardTypes.REAL:
                        return Optional.of(REAL);
                    case StandardTypes.DOUBLE:
                        return Optional.of(DOUBLE);
                    default:
                        return Optional.empty();
                }
            }
            case StandardTypes.REAL: {
                switch (resultTypeBase) {
                    case StandardTypes.DOUBLE:
                        return Optional.of(DOUBLE);
                    default:
                        return Optional.empty();
                }
            }
            case StandardTypes.DATE: {
                switch (resultTypeBase) {
                    case StandardTypes.TIMESTAMP:
                        return Optional.of(TIMESTAMP);
                    case StandardTypes.TIMESTAMP_WITH_TIME_ZONE:
                        return Optional.of(TIMESTAMP_WITH_TIME_ZONE);
                    default:
                        return Optional.empty();
                }
            }
            case StandardTypes.TIME: {
                switch (resultTypeBase) {
                    case StandardTypes.TIME_WITH_TIME_ZONE:
                        return Optional.of(TIME_WITH_TIME_ZONE);
                    default:
                        return Optional.empty();
                }
            }
            case StandardTypes.TIMESTAMP: {
                switch (resultTypeBase) {
                    case StandardTypes.TIMESTAMP_WITH_TIME_ZONE:
                        return Optional.of(TIMESTAMP_WITH_TIME_ZONE);
                    default:
                        return Optional.empty();
                }
            }
            case StandardTypes.VARCHAR: {
                switch (resultTypeBase) {
                    case StandardTypes.CHAR:
                        VarcharType varcharType = (VarcharType) sourceType;
                        if (varcharType.isUnbounded()) {
                            return Optional.of(createCharType(CharType.MAX_LENGTH));
                        }

                        return Optional.of(createCharType(Math.min(CharType.MAX_LENGTH, varcharType.getBoundedLength())));
                    case JoniRegexpType.NAME:
                        return Optional.of(JONI_REGEXP);
                    case Re2JRegexpType.NAME:
                        return Optional.of(RE2J_REGEXP);
                    case JsonPathType.NAME:
                        return Optional.of(JSON_PATH);
                    case CodePointsType.NAME:
                        return Optional.of(CODE_POINTS);
                    default:
                        return Optional.empty();
                }
            }
            case StandardTypes.CHAR: {
                switch (resultTypeBase) {
                    case StandardTypes.VARCHAR:
                        return Optional.empty();
                    case JoniRegexpType.NAME:
                        return Optional.of(JONI_REGEXP);
                    case Re2JRegexpType.NAME:
                        return Optional.of(RE2J_REGEXP);
                    case JsonPathType.NAME:
                        return Optional.of(JSON_PATH);
                    case CodePointsType.NAME:
                        return Optional.of(CODE_POINTS);
                    default:
                        return Optional.empty();
                }
            }
            case StandardTypes.P4_HYPER_LOG_LOG: {
                switch (resultTypeBase) {
                    case StandardTypes.HYPER_LOG_LOG:
                        return Optional.of(HYPER_LOG_LOG);
                    default:
                        return Optional.empty();
                }
            }
            default:
                return Optional.empty();
        }
    }