fluss-lake/fluss-lake-paimon/src/main/java/com/alibaba/fluss/lake/paimon/FlussDataTypeToPaimonDataType.java [45:166]:
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public class FlussDataTypeToPaimonDataType implements DataTypeVisitor<DataType> {

    public static final FlussDataTypeToPaimonDataType INSTANCE =
            new FlussDataTypeToPaimonDataType();

    @Override
    public DataType visit(CharType charType) {
        return withNullability(DataTypes.CHAR(charType.getLength()), charType.isNullable());
    }

    @Override
    public DataType visit(StringType stringType) {
        return withNullability(DataTypes.STRING(), stringType.isNullable());
    }

    @Override
    public DataType visit(BooleanType booleanType) {
        return withNullability(DataTypes.BOOLEAN(), booleanType.isNullable());
    }

    @Override
    public DataType visit(BinaryType binaryType) {
        return withNullability(DataTypes.BINARY(binaryType.getLength()), binaryType.isNullable());
    }

    @Override
    public DataType visit(BytesType bytesType) {
        return withNullability(DataTypes.BYTES(), bytesType.isNullable());
    }

    @Override
    public DataType visit(DecimalType decimalType) {
        return withNullability(
                DataTypes.DECIMAL(decimalType.getPrecision(), decimalType.getScale()),
                decimalType.isNullable());
    }

    @Override
    public DataType visit(TinyIntType tinyIntType) {
        return withNullability(DataTypes.TINYINT(), tinyIntType.isNullable());
    }

    @Override
    public DataType visit(SmallIntType smallIntType) {
        return withNullability(DataTypes.SMALLINT(), smallIntType.isNullable());
    }

    @Override
    public DataType visit(IntType intType) {
        return withNullability(DataTypes.INT(), intType.isNullable());
    }

    @Override
    public DataType visit(BigIntType bigIntType) {
        return withNullability(DataTypes.BIGINT(), bigIntType.isNullable());
    }

    @Override
    public DataType visit(FloatType floatType) {
        return withNullability(DataTypes.FLOAT(), floatType.isNullable());
    }

    @Override
    public DataType visit(DoubleType doubleType) {
        return withNullability(DataTypes.DOUBLE(), doubleType.isNullable());
    }

    @Override
    public DataType visit(DateType dateType) {
        return withNullability(DataTypes.DATE(), dateType.isNullable());
    }

    @Override
    public DataType visit(TimeType timeType) {
        return withNullability(DataTypes.TIME(), timeType.isNullable());
    }

    @Override
    public DataType visit(TimestampType timestampType) {
        return withNullability(
                DataTypes.TIMESTAMP(timestampType.getPrecision()), timestampType.isNullable());
    }

    @Override
    public DataType visit(LocalZonedTimestampType localZonedTimestampType) {
        return withNullability(
                DataTypes.TIMESTAMP_WITH_LOCAL_TIME_ZONE(localZonedTimestampType.getPrecision()),
                localZonedTimestampType.isNullable());
    }

    @Override
    public DataType visit(ArrayType arrayType) {
        return withNullability(
                DataTypes.ARRAY(arrayType.getElementType().accept(this)), arrayType.isNullable());
    }

    @Override
    public DataType visit(MapType mapType) {
        return withNullability(
                DataTypes.MAP(
                        mapType.getKeyType().accept(this), mapType.getValueType().accept(this)),
                mapType.isNullable());
    }

    @Override
    public DataType visit(RowType rowType) {
        org.apache.paimon.types.RowType.Builder rowTypeBuilder =
                org.apache.paimon.types.RowType.builder();
        for (DataField field : rowType.getFields()) {
            rowTypeBuilder.field(
                    field.getName(),
                    field.getType().accept(this),
                    field.getDescription().orElse(null));
        }
        return withNullability(rowTypeBuilder.build(), rowType.isNullable());
    }

    private DataType withNullability(DataType paimon, boolean nullable) {
        if (paimon.isNullable() != nullable) {
            return nullable ? paimon.nullable() : paimon.notNull();
        }
        return paimon;
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fluss-lakehouse/fluss-lakehouse-paimon/src/main/java/com/alibaba/fluss/lakehouse/paimon/sink/FlussDataTypeToPaimonDataType.java [45:166]:
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public class FlussDataTypeToPaimonDataType implements DataTypeVisitor<DataType> {

    public static final FlussDataTypeToPaimonDataType INSTANCE =
            new FlussDataTypeToPaimonDataType();

    @Override
    public DataType visit(CharType charType) {
        return withNullability(DataTypes.CHAR(charType.getLength()), charType.isNullable());
    }

    @Override
    public DataType visit(StringType stringType) {
        return withNullability(DataTypes.STRING(), stringType.isNullable());
    }

    @Override
    public DataType visit(BooleanType booleanType) {
        return withNullability(DataTypes.BOOLEAN(), booleanType.isNullable());
    }

    @Override
    public DataType visit(BinaryType binaryType) {
        return withNullability(DataTypes.BINARY(binaryType.getLength()), binaryType.isNullable());
    }

    @Override
    public DataType visit(BytesType bytesType) {
        return withNullability(DataTypes.BYTES(), bytesType.isNullable());
    }

    @Override
    public DataType visit(DecimalType decimalType) {
        return withNullability(
                DataTypes.DECIMAL(decimalType.getPrecision(), decimalType.getScale()),
                decimalType.isNullable());
    }

    @Override
    public DataType visit(TinyIntType tinyIntType) {
        return withNullability(DataTypes.TINYINT(), tinyIntType.isNullable());
    }

    @Override
    public DataType visit(SmallIntType smallIntType) {
        return withNullability(DataTypes.SMALLINT(), smallIntType.isNullable());
    }

    @Override
    public DataType visit(IntType intType) {
        return withNullability(DataTypes.INT(), intType.isNullable());
    }

    @Override
    public DataType visit(BigIntType bigIntType) {
        return withNullability(DataTypes.BIGINT(), bigIntType.isNullable());
    }

    @Override
    public DataType visit(FloatType floatType) {
        return withNullability(DataTypes.FLOAT(), floatType.isNullable());
    }

    @Override
    public DataType visit(DoubleType doubleType) {
        return withNullability(DataTypes.DOUBLE(), doubleType.isNullable());
    }

    @Override
    public DataType visit(DateType dateType) {
        return withNullability(DataTypes.DATE(), dateType.isNullable());
    }

    @Override
    public DataType visit(TimeType timeType) {
        return withNullability(DataTypes.TIME(), timeType.isNullable());
    }

    @Override
    public DataType visit(TimestampType timestampType) {
        return withNullability(
                DataTypes.TIMESTAMP(timestampType.getPrecision()), timestampType.isNullable());
    }

    @Override
    public DataType visit(LocalZonedTimestampType localZonedTimestampType) {
        return withNullability(
                DataTypes.TIMESTAMP_WITH_LOCAL_TIME_ZONE(localZonedTimestampType.getPrecision()),
                localZonedTimestampType.isNullable());
    }

    @Override
    public DataType visit(ArrayType arrayType) {
        return withNullability(
                DataTypes.ARRAY(arrayType.getElementType().accept(this)), arrayType.isNullable());
    }

    @Override
    public DataType visit(MapType mapType) {
        return withNullability(
                DataTypes.MAP(
                        mapType.getKeyType().accept(this), mapType.getValueType().accept(this)),
                mapType.isNullable());
    }

    @Override
    public DataType visit(RowType rowType) {
        org.apache.paimon.types.RowType.Builder rowTypeBuilder =
                org.apache.paimon.types.RowType.builder();
        for (DataField field : rowType.getFields()) {
            rowTypeBuilder.field(
                    field.getName(),
                    field.getType().accept(this),
                    field.getDescription().orElse(null));
        }
        return withNullability(rowTypeBuilder.build(), rowType.isNullable());
    }

    private DataType withNullability(DataType paimon, boolean nullable) {
        if (paimon.isNullable() != nullable) {
            return nullable ? paimon.nullable() : paimon.notNull();
        }
        return paimon;
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