<p>A mix of integers and NULL values will work fine for a field with "integer" type and "nullable" node, but not if the mode is "required" (since this disallows NULL values). </p>
<p>Note that when importing data as CSV, NULL values are represented by an empty field, not by the string "NULL" nor like "\N".</p>
<p>This tip was originally posted on <a href="http://stackoverflow.com/questions/28740381/Working%20with%20null%20values%20in%20Google%20BigQuery%20using%20Talend%20Big%20Data/28741712">Stack Overflow</a>.</p>
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