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Avoid xarray len implementation loading data #1467

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merged 1 commit into from May 22, 2017

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philippjfr commented May 21, 2017

XArray supports lazy loading of data but the current xarray interface uses the actual array data to determine the length of the data, which is highly inefficient. This PR instead uses the product of the coordinate array lengths which are always in memory to determine the overall length.

@philippjfr philippjfr added the data label May 21, 2017

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jlstevens commented May 21, 2017

Makes sense, happy to merge when the tests go green.

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jlstevens commented May 22, 2017

Tests are green. Merging.

@jlstevens jlstevens merged commit 9388c12 into master May 22, 2017

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coverage/coveralls Coverage increased (+1.1%) to 78.832%
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s3-reference-data-cache Test data is cached.
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@philippjfr philippjfr deleted the xarray_len branch May 25, 2017

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