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ftstring vs varchar in TFDMemTable

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I usually use varchar fields in SQL databases with a big number as max size.

When I use a TFDMemTable, does the ftstring size consumes memory as described in its definition?

If I declare it as "Add('lab',ftstring,500)", does it consumes in memory 500bytes (or 1000bytes) for each record, or as a Delphi string type is just the content string size ?

I have Delphi professional and I can not see its code.

Thank you in advance

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