Retrieving the most common keywords from a tsvector column

I'm considering adding a tsvector column to an existing table that will hold possible search terms fo开发者_开发百科r multiple columns in that same table (e.g. the tsvector column will equal to_tsvector(header || ' ' || body || ' ' || footer)). Before I decide to do so, one of my requirements is that I am able to find the most popular keywords amongst all records in the table.

Is there anything similar to tsquery that will find my the most popular keywords over all records?

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Most probably the ts_stat FTS function is what you're after.