LOAD DATA INFILE (*.csv) - ignore empty cells - sql

Question

I'm about to import a large (500 MB) *.csv file to a MySQL database.
I'm as far as that:
LOAD DATA INFILE '<file>'
REPLACE
INTO TABLE <table-name>
FIELDS
TERMINATED BY ';'
OPTIONALLY ENCLOSED BY '"'
IGNORE 1 LINES ( #Header
<column-name1>,
<column-name2>,
...
);
I have a problem with one of the coluns (it's data type is int) - I get an error Message:
Error Code: 1366 Incorrect integer value: ' ' for column at row
I looked at this line in the *.csv-file. The cell that causes the error has just a whitespace inside (like this: ...; ;...).
How can I tell SQL to ignore whitespaces in this column?
As the *.csv-file is very big and I have to import even bigger ones afterwards, I'd like to avoid editing the *.csv-file; I'm looking for a SQL-solution.

Answer 1

Add a SET COLUMN like so:
LOAD DATA INFILE 'file.txt'
INTO TABLE t1
(column1, #var1)
SET column2 = #var1/100;
You need to replace the #var1/100 with an expression that handles the 'space' and convert to -Infinity or 0 or 42... not sure..

Answer 2

This answer was originally included in the question as an edit by #speendo; I have converted it into a proper answer.
The solution is:
LOAD DATA INFILE '<file>'
REPLACE
INTO TABLE <table-name>
FIELDS
TERMINATED BY ';'
OPTIONALLY ENCLOSED BY '"'
IGNORE 1 LINES ( #Header
<column-name1>,
<column-name2>,
#var1 #the variable that causes the problem
...
)
SET <column-name-of-problematic-column> = CASE
WHEN #var1 = ' ' THEN NULL
ELSE #var1
END
;