Columns without data (nulls) doesn't propagated in output schema

Description

It's not possible to propagate a column that has no values at all (null) when import a table from mysql.
When replacing the null values to some default value ,It can be seen in the output schema.

Empty columns (nulls) should be preserved in the output schema.

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Created December 3, 2018 at 8:20 PM
Updated June 16, 2020 at 7:55 PM