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tests for handling of value_null in each datasource #1644

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springmeyer opened this Issue · 2 comments

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@springmeyer
Owner

When the postgis tests are done, I will close mapbox/carto#75

Followup to #1642 and #794

@springmeyer
Owner

also need to review entire behavior after 562fada#include/mapnik/feature.hpp, in that we may no longer need to return actual value_null() instance from datasource plugins.

@springmeyer springmeyer referenced this issue in mapbox/carto
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Allow searching for null values #75

@springmeyer
Owner

confirmed that for postgres we do not need to store null values. storing nulls is equivalent to accessing attributes that do not exist in the feature, but saves space. The only other plugins that started storing nulls were sqlite and shape and they should behave the same.

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