optimization: wrong dimensionality of string arrays

[pacesm]

The dimension of the string arrays saved in the optimized netCDF is not the same as read from the original product. This is likely caused by treating the strings as nested arrays (both dtype object).

E.g., the AE_OPER_AUX_ZWC_1B_20191125T225435_20191126T002435_000 /DATA/ZWC_result_type from the original product is read as (shape (106,)):

[
    'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both',
    'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both',
    'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both',
    'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both',
    'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both',
    'ZWC_Both', 'ZWC_Both', 'ZWC_Rayleigh', 'ZWC_Mie', 'ZWC_Mie', 'ZWC_Both',
    'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both',
    'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both',
    'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both',
    'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both',
    'ZWC_Rayleigh', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both',
    'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both',
    'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both',
    'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Mie',
    'ZWC_Both', 'ZWC_Rayleigh', 'ZWC_Both', 'ZWC_Mie', 'ZWC_Both', 'ZWC_Both',
    'ZWC_Both', 'ZWC_Both', 'ZWC_Mie', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both',
    'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both',
    'ZWC_Both', 'ZWC_Both', 'ZWC_Both', 'ZWC_Both'
]

... but the netCDF stores the same variable as (shape (106, 1))

[
    ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'],
    ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'],
    ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'],
    ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'],
    ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'],
    ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'],
    ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Rayleigh'], ['ZWC_Mie'], ['ZWC_Mie'],
    ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'],
    ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'],
    ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'],
    ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'],
    ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'],
    ['ZWC_Rayleigh'], ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'],
    ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'],
    ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'],
    ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'],
    ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Mie'], ['ZWC_Both'],
    ['ZWC_Rayleigh'], ['ZWC_Both'], ['ZWC_Mie'], ['ZWC_Both'], ['ZWC_Both'],
    ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Mie'], ['ZWC_Both'], ['ZWC_Both'],
    ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'],
    ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'], ['ZWC_Both'],
    ['ZWC_Both']
]