Getting ValueError for DRO query that returns 0 rows

[mrafayaleem]

I have a DRO query that returns 0 rows. I get the following error in a case like this. Wouldn't it be better to skip DRO generation for queries with 0 rows and then fail those checks that have their dro files marked as instead of failing dro generation for an entire distribution reference file with multiple named dros?

Soda Core 3.0.10
Traceback (most recent call last):
    update_dro_func(
  File "/usr/local/lib/python3.8/site-packages/soda/cli/cli.py", line 346, in update_dro
    dro = DROGenerator(RefDataCfg(distribution_type=distribution_type), column_values).generate()
  File "/usr/local/lib/python3.8/site-packages/soda/scientific/distribution/generate_dro.py", line 121, in generate
    return self.generate_continuous_dro()
  File "/usr/local/lib/python3.8/site-packages/soda/scientific/distribution/generate_dro.py", line 70, in generate_continuous_dro
    n_bins = self._compute_n_bins(data)
  File "/usr/local/lib/python3.8/site-packages/soda/scientific/distribution/generate_dro.py", line 32, in _compute_n_bins
    _range = (data.min(), data.max())
  File "/usr/local/lib/python3.8/site-packages/numpy/core/_methods.py", line 44, in _amin
    return umr_minimum(a, axis, None, out, keepdims, initial, where)
ValueError: zero-size array to reduction operation minimum which has no identity

[jmarien]

SODA-1205

[baturayo]

Hi @mrafayaleem,

Thanks lot for reporting the issue. I created a PR to handle tables having 0 rows :)