| gather_factory | R Documentation | 
Factory to create gather functions
gather_factory( default.column.name, default.column.empty, expand.fun, required.type )
| default.column.name | the desired name of the default added column | 
| default.column.empty | the value to use when the default column should be empty because the JSON has length 0 | 
| expand.fun | a function applied to the JSON that will expand the rows in the tbl_df | 
| required.type | the json_types type that must be present in every element of the JSON for this to succeed | 
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