Large data sets take a while to complete. When you change any column type it restarts the compare. If you cancel, you can no longer see the column names.
An awesome feature would allow you to suspend the compare, set all the column types (key column, unimportant column, standard column), then restart the compare.
An awesome feature would allow you to suspend the compare, set all the column types (key column, unimportant column, standard column), then restart the compare.
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