Multiple appends with ndarray data raises UnhandledDtypeException

[aflag]

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Arctic Version

1.61

Arctic Store

VersionStore

Platform and version

Python 2.7.11

Description of problem and/or code sample that reproduces the issue

This code raises UnhandledDtypeException:

import numpy as np

from arctic import Arctic, VERSION_STORE

library_name = "mytest"
key = "mykey"

arctic = Arctic(mongo_host="127.0.0.1:27017")
arctic.initialize_library(library_name, VERSION_STORE)

vstore = arctic[library_name]

data = np.random.rand(1, 10)
vstore.write(key, data)
vstore.append(key, data)
vstore.append(key, data)

The append method works with one-dimensional arrays (ie. if we used rand(10) instead of rand(1, 10)). However, it doesn't properly keep track of the array shape as new dimensions are introduced.

[shashank88]

Still valid, just checked, will take a quick look