On 9/29/16 1:51 PM, Heikki Linnakangas wrote:
Jim, I was confused, but you agreed with me. Were you also confused, or
am I missing something?
I was confused by inputs:
CREATE FUNCTION repr(i foo[]) RETURNS text LANGUAGE plpythonu AS
$$return repr(i)$$;
select repr(array[row(1,2)::foo, row(3,4)::foo]);
repr
--------------------
['(1,2)', '(3,4)']
(1 row)
(in ipython...)
In [1]: i=['(1,2)', '(3,4)']
In [2]: type(i)
Out[2]: list
In [3]: type(i[0])
Out[3]: str
I wonder if your examples work only
Now, back to multi-dimensional arrays. I can see that the Sequence
representation is problematic, with arrays, because if you have a python
list of lists, like [[1, 2]], it's not immediately clear if that's a
one-dimensional array of tuples, or two-dimensional array of integers.
Then again, we do have the type definitions available. So is it really
ambiguous?
[[1,2]] is a list of lists...
In [4]: b=[[1,2]]
In [5]: type(b)
Out[5]: list
In [6]: type(b[0])
Out[6]: list
If you want a list of tuples...
In [7]: c=[(1,2)]
In [8]: type(c)
Out[8]: list
In [9]: type(c[0])
Out[9]: tuple
--
Jim Nasby, Data Architect, Blue Treble Consulting, Austin TX
Experts in Analytics, Data Architecture and PostgreSQL
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