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The impact of the wide columns is mainly when you query the data. I.e. if the user queries others columns in the table, the wide column will not impact the query performance. If the column is queried often, the better approach is to parse out the pertinent piece(s) of information and load into dedicated & right-sized columns for most reporting purposes. You can leave the raw data in the current column but advise users to avoid accessing those columns.
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