[development] Get real field and table alias in a filter handler

[Lluís Forns]

I am developing a module to expose a filter which search for selectect
text inside selected fields of a view.

I managed to code everything (most code taken from
"http://drupal.org/project/views_groupby").

My only problem is inside query(); I add a WHERE to the query with
CONCAT(all fields) LIKE 'string'. My problem is when getting fields; i
manage to get real_field, but I cannot get table_alias.

Any hint?

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