tests for handling of value_null in each datasource #1644

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springmeyer opened this Issue Dec 12, 2012 · 2 comments

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

Followup to #1642 and #794

@springmeyer
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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 Apr 11, 2013
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Allow searching for null values #75

@springmeyer
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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.

@springmeyer springmeyer pushed a commit that referenced this issue Apr 11, 2013
Dane Springmeyer plugins do not need to store nulls / save space - refs #1644 9da1f35
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