Add a hashcode implementation to SchemaField by azymnis · Pull Request #3601 · googleapis/google-cloud-python

azymnis · 2017-07-12T10:03:04Z

Problem: I need to compare a new schema with an existing table schema. Easiest way would be to use set comparison operators. However this is not possible with SchemaField because there is no implementation of __hash__.

Solution: Add a simple implementation of __hash__ using tuple keys. This is not the most efficient implementation of a hashcode but should probably be ok for most purposes.

googlebot · 2017-07-12T10:03:06Z

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azymnis · 2017-07-12T10:04:20Z

I signed!

googlebot · 2017-07-12T10:04:21Z

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dhermes · 2017-07-12T15:12:28Z

I was a bit confused by what is needed, but this example clarifies for me:

>>>classA(object):
... def__init__(self, val):
... self.val=val
... def__repr__(self):
... return'A({!r})'.format(self.val)
... def__eq__(self, other):
... ifnotisinstance(other, A):
... returnNotImplemented
... returnother.val==self.val
... def__ne__(self, other):
... ifnotisinstance(other, A):
... returnNotImplemented
... returnother.val!=self.val
...
>>>a1=A(10)
>>>a2=A(11)
>>>a3=A(11)
>>>a1==a2False>>>a1==a3False>>>a2==a3True>>>set([a1, a2, a3])
set([A(10), A(11), A(11)])

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 self.fields = fields

- def __eq__(self, other):
+ def __key(self):


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+ self.field_type.lower(),
+ self.mode,
+ self.description,
+ self.fields)


azymnis · 2017-07-13T11:00:45Z

@dhermes @tseaver what do you think of this?

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 self.mode = mode
 self.description = description
- self.fields = fields
+ self.fields = None if(fields is None) else tuple(fields)


azymnis · 2017-07-17T13:41:03Z

@dhermes @tseaver i modified the default arg for fields to be (). The question is what to do with how this resource is represented. Should I use () there too? This is what I did, so if you would rather have me use [] I can change that.

FYI: this broke a few tests and I'm wondering if it will break any of the actual api calls.

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 info['description'] = field.description
 if field.fields is not None:
- info['fields'] = _build_schema_resource(field.fields)
+ info['fields'] = tuple(_build_schema_resource(field.fields))


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 """
 if 'fields' not in info:
- return None
+ return ()


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+ def __hash__(self):
+ return hash(self._key())
+
+ def __repr__(self):


azymnis · 2017-07-17T16:28:49Z

Hmm looks like I broke some tests in circleci, let me go fix that

googlebot · 2017-07-17T17:11:28Z

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dhermes · 2017-07-17T17:12:17Z

@azymnis We (@jonparrott, @lukesneeringer and I) just had a discussion about this and determined SchemaField should be immutable in order to be hashable.

Rather than put the burden on you, I have sent a commit into this PR to make the class immutable.

lukesneeringer

One style nitpick.

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 'schema': {'fields': [
- {'name': 'full_name', 'type': 'STRING', 'mode': 'REQUIRED'},
- {'name': 'age', 'type': 'INTEGER', 'mode': 'REQUIRED'},
+ {'name':


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+ self._fields,
+ )
+
+ def __eq__(self, other):


azymnis · 2017-07-17T17:45:06Z

@dhermes makes sense, thanks for the update

azymnis · 2017-07-17T18:54:44Z

Thank you all!

* Add a __hash__ implementation to SchemaField * Modify default list of subfields to be the empty tuple * Making SchemaField immutable. * Adding SchemaField.__ne__.

googlebot added the cla: no This human has *not* signed the Contributor License Agreement. label Jul 12, 2017

googlebot added cla: yes This human has signed the Contributor License Agreement. and removed cla: no This human has *not* signed the Contributor License Agreement. labels Jul 12, 2017

dhermes reviewed Jul 12, 2017
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Comment threadbigquery/google/cloud/bigquery/schema.py Outdated
self.fields = fields

def __eq__(self, other):
def __key(self):
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tseaver reviewed Jul 12, 2017
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dhermes added the api: bigquery Issues related to the BigQuery API. label Jul 12, 2017

dhermes reviewed Jul 13, 2017
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Comment threadbigquery/google/cloud/bigquery/schema.py Outdated
self.mode = mode
self.description = description
self.fields = fields
self.fields = None if(fields is None) else tuple(fields)
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azymnis commented Jul 17, 2017
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Comment threadbigquery/google/cloud/bigquery/table.py Outdated
info['description'] = field.description
if field.fields is not None:
info['fields'] = _build_schema_resource(field.fields)
info['fields'] = tuple(_build_schema_resource(field.fields))
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azymnis commented Jul 17, 2017
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Comment threadbigquery/google/cloud/bigquery/table.py
"""
if 'fields' not in info:
return None
return ()
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azymnis commented Jul 17, 2017
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Comment threadbigquery/google/cloud/bigquery/schema.py
def __hash__(self):
return hash(self._key())

def __repr__(self):
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lukesneeringer approved these changes Jul 17, 2017
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dhermes force-pushed the azymnis/schema_hashcode branch from 5dc1f46 to 66a3d66Compare July 17, 2017 17:11

googlebot added cla: no This human has *not* signed the Contributor License Agreement. and removed cla: yes This human has signed the Contributor License Agreement. labels Jul 17, 2017

lukesneeringer suggested changes Jul 17, 2017
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Argyris Zymnisand others added 6 commits July 17, 2017 10:33

Add a hashcode implementation to SchemaField
7c015fc

Rename key method, add docstring, store fields as tuples
3b5c7ba

Modify default list of subfields to be the empty tuple
1974553

Fix linting and remove unused if statement
b650702

Fix a typo
5a6a4a0

Making SchemaField immutable.
2f728fa

Reducing the number of "secondary" changes caused by SchemaField change.
8882df3

dhermes force-pushed the azymnis/schema_hashcode branch from 66a3d66 to 8882df3Compare July 17, 2017 17:33

dhermes added 2 commits July 17, 2017 10:34

Getting rid of spurious empty line in SchemaField.mode docstring.
3a0ad42

Adding SchemaField.__ne__.
c4f4234

theacodes approved these changes Jul 17, 2017
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dhermes merged commit 59fd1e4 into googleapis:masterJul 17, 2017

azymnis deleted the azymnis/schema_hashcode branch July 17, 2017 18:53

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