between 0 and 1.0 for the column
    truncate-beginning if value can't fit a table cell, remove the first characters
    truncate-end if value can't fit a table cell, remove the last characters

 If no value exist, or a numeric value can't be aggregated, the result is 'N/A',
 unless missing:whitespace is used. The top frame of a stack trace can be referred'
 to as stackTrace.topFrame. When multiple event types are specified in a FROM clause,
 the union of the event types are used (not the cartesian product)

 To see all available events, use the query '"SHOW EVENTS"'. To see all fields for
 a particular event type, use the query '"SHOW FIELDS <type>"'.