Don't try to backfill no-data values. Honor the row expression and copy

Crunch-io / scrunch

Pythonic scripting library for cleaning data in Crunch

GNU Lesser General Public License v3.0

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Don't try to backfill no-data values. Honor the row expression and copy #392

Closed jjdelc closed 3 years ago

jjdelc commented 3 years ago

This fix addresses a bug on backfill, that it would only overwrite values if the target column cells had No Data on them.

This eliminates the need for a fill function and replaces the column straight. This is safe because we know that they both have the exact same type given how we created the tmp dataset.