RethinkDB converts float 0.0 to int 0

[EugeniuZ]

Hi,

Seems that RethinkDB is converting float value of 0.0 to integer value of 0. In my scenario the problem is that python dictionaries are saved in RethinkDB and upon retrieval this (undesired) conversion happens. Some of the upstream systems check for the type of the field (float is expected but an int is received).

Is there a way to avoid this conversion? Is it a feature or a bug?

task_info = {'a': 0.0, 'b': +0.0, 'c': -0.0}
ta = task_info['a']
tb = task_info['b']
tc = task_info['c']
print(f'ta - {type(ta)}, {ta}')
print(f'tb - {type(tb)}, {tb}')
print(f'tc - {type(tc)}, {tc}')
result = r.table(table).insert(task_info).run(connection)
task_id = result['generated_keys'][0]

Output is:

ta - <class 'float'>, 0.0
tb - <class 'float'>, 0.0
tc - <class 'float'>, -0.0

document = r.table(table).get(task_id).run(connection)
print(document)
a = document['a']
b = document['b']
c = document['c']
print(f'a - {type(a)}, {a}')
print(f'b - {type(b)}, {b}')
print(f'b - {type(c)}, {c}')

Output is:

{'a': 0, 'b': 0, 'c': -0.0, 'id': 'd8df59a5-330f-4cd0-84ac-394b70a05b9d'}
a - <class 'int'>, 0
b - <class 'int'>, 0
b - <class 'float'>, -0.0

Using the latest container (rethinkdb 2.4.1~0buster) Python client version (rethinkdb==2.4.8)

[sefgit]

You could enforce type, instead of relying on implicit type conversion.

a = foat(document['a']) b = float(document['b']) c = float(document['c'])

https://www.geeksforgeeks.org/type-conversion-python/

On Thu, Sep 2, 2021, 22:30 Eugeniu @.***> wrote:

Hi,

Seems that RethinkDB is converting float value of 0.0 to integer value of 0. In my scenario the problem is that python dictionaries are saved in RethinkDB and upon retrieval this (undesired) conversion happens. Some of the upstream systems check for the type of the field (float is expected but an int is received).

Is there a way to avoid this conversion? Is it a feature or a bug?

task_info = {'a': 0.0, 'b': +0.0, 'c': -0.0}ta = task_info['a']tb = task_info['b']tc = task_info['c']print(f'ta - {type(ta)}, {ta}')print(f'tb - {type(tb)}, {tb}')print(f'tc - {type(tc)}, {tc}')result = r.table(table).insert(task_info).run(connection)task_id = result['generated_keys'][0]

Output is:

ta - <class 'float'>, 0.0 tb - <class 'float'>, 0.0 tc - <class 'float'>, -0.0

document = r.table(table).get(task_id).run(connection)print(document)a = document['a']b = document['b']c = document['c']print(f'a - {type(a)}, {a}')print(f'b - {type(b)}, {b}')print(f'b - {type(c)}, {c}')

Output is:

{'a': 0, 'b': 0, 'c': -0.0, 'id': 'd8df59a5-330f-4cd0-84ac-394b70a05b9d'} a - <class 'int'>, 0 b - <class 'int'>, 0 b - <class 'float'>, -0.0

Using the latest container (rethinkdb 2.4.1~0buster) Python client version (rethinkdb==2.4.8)

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[srh]

This is a behavior of the Python driver, not RethinkDB itself, which only has one numeric type, finite 64-bit floats.

I think the related code is here:

https://github.com/rethinkdb/rethinkdb-python/blob/master/rethinkdb/ast.py#L780

and that this behavior is a result of JSONDecoder: https://docs.python.org/3/library/json.html#json.JSONDecoder

There is no way to avoid this behavior. I don't think it's a bug. I'd describe the behavior as a decision rather than a feature.

[EugeniuZ]

Hi @srh ,

If i try conversion to an from a string i get this result:

>>> task_info
{'a': 0.0, 'b': 0.0, 'c': -0.0}
>>> s = json.dumps(task_info)
>>> s
'{"a": 0.0, "b": 0.0, "c": -0.0}'
>>> json.loads(s)
{'a': 0.0, 'b': 0.0, 'c': -0.0}

@sefgit - the code handling the python dictionaries doesn't make any assumption about the structure of received the documents (which can have various levels of nesting) so using explicit conversion would require to make assumptions about the structure and data types of the fields in received documents.