#72: Support arrays with start index != 1
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Reporter: cito | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: 5.1
Component: DB API 2 | Version: 5.0
Keywords: array cast |
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The current implementation of the `cast_array` function in the C module
ignores the start index of PostgreSQL arrays. They are assumed to always
be 1. As discussed on the mailing list in September 2016, this should be
improved:
The idea is that the `cast_array` function should take an additonal,
optional `cls` parameter which will then be used as the base class for the
array. If that parameter is `None` or `list`, then the method works as
before, returning a list or a list of lists for multidimensional arrays.
If it is any other class, then this will be considered as a subclass of
list that will be used instead of the builtin list for building the return
values. In addition, the instances of this list subclass will have a
`lower` attribute set to the start index of the corresponding PostgreSQL
(sub)arrays by the `cast_array` function.
It should then be possible to change the default value for `cls` passed
into the `cast_array` function to a custom list subclass. That subclass
could consider the start index when getting items, and return `None` it
the index points to outside the array. This would emulate the behavior of
PostgreSQL arrays more closely.
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Ticket URL: <http://trac.pygresql.org:8000/pgtracker/ticket/72>
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