quantopian / zipline / 10541

88%

master: 88%

Pull #2580

travis-ci

BUG: Fix bug concatenating empty chunks with strings.

Fixes a bug where running chunked pipelines containing string columns would
fail if some of the chunks were completely empty. We failed because the empty
chunks would have different dtypes (all `object`) than the non-empty chunks,
because pandas can't determine a dtype for an empty DataFrame.

We fix the bug by filtering out empty chunks before concatenation.

2 of 2 new or added lines in 1 file covered. (100.0%)

14125 of 16098 relevant lines covered (87.74%)

0.88 hits per line