private static DataType convertFromColumn(Column column) {
        switch (column.jdbcType()) {
            case Types.CHAR:
            case Types.VARCHAR:
            case Types.NCHAR:
            case Types.NVARCHAR:
            case Types.STRUCT:
            case Types.CLOB:
                return DataTypes.STRING();
            case Types.BLOB:
                return DataTypes.BYTES();
            case Types.INTEGER:
            case Types.SMALLINT:
            case Types.TINYINT:
                return DataTypes.INT();
            case Types.FLOAT:
            case Types.REAL:
            case OracleTypes.BINARY_FLOAT:
                return DataTypes.FLOAT();
            case Types.DOUBLE:
            case OracleTypes.BINARY_DOUBLE:
                return DataTypes.DOUBLE();
            case Types.NUMERIC:
            case Types.DECIMAL:
                return DataTypes.DECIMAL(column.length(), column.scale().orElse(0));
            case Types.DATE:
                return DataTypes.DATE();
            case Types.TIMESTAMP:
            case Types.TIMESTAMP_WITH_TIMEZONE:
            case OracleTypes.TIMESTAMPTZ:
            case OracleTypes.TIMESTAMPLTZ:
                return column.length() >= 0
                        ? DataTypes.TIMESTAMP(column.length())
                        : DataTypes.TIMESTAMP();
            case OracleTypes.INTERVALYM:
                return DataTypes.INTERVAL(DataTypes.YEAR(), DataTypes.MONTH());
            case OracleTypes.INTERVALDS:
                return DataTypes.INTERVAL(DataTypes.DAY(), DataTypes.SECOND());
            case Types.BOOLEAN:
                return DataTypes.BOOLEAN();
            default:
                throw new UnsupportedOperationException(
                        String.format(
                                "Don't support Oracle type '%s' yet, jdbcType:'%s'.",
                                column.typeName(), column.jdbcType()));
        }
    }
Returns a corresponding Flink data type from a debezium {@link Column} with nullable always
be true, copy from io.debezium.connector.oracle.OracleValueConverters#converte.
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/oracle-cdc/src/main/java/org/apache/inlong/sort/cdc/oracle/source/utils/OracleTypeUtils.java