Thought it would be the case

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I did some research and I found that the DDL contents are stored in the table

So, in case that someone else has the same problem and reads this, let's say that the conclusion is: if you have large quantities of data and need to filter by field values; don't use DDLs (at least not in the 6.2 version), use tables built with ServiceBuilder instead (and if you need the users to manage the data, develop a portlet which allows them to do it).