| checkColRow | R Documentation | 
In order to safely merge by a unique row identifier, that row identifier must not be edited from input to output. checkColRow helps checking that based on the control stream.
checkColRow(col.row, file)
| col.row | The name of the unique row identifier (say "ROW"). | 
| file | a list file or input control stream file path. | 
TRUE if no issues found
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