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Allowing user to set how many number of lines should be scan to determined field data type when importing *.xlsx file
With the current design, for .xlsx format excel files only first 200 rows are scanned to determine the field type, if no data presented in the first 200 rows, then that column is deemed as a numerical field by default.
So, when importing data with characters entered after the 200th line, Modeler treats it as $null$, even though the data is actually entered.
To avoid this unexpected result, Modeler should provide a WARNING to allow user make a correction by set the field type manually.
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