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Table Column Retrieval

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Recently I read that one of the distinctions between a standard database and a columnar one, which led to an increase in its efficiency, was and I quote:

"Only relevant columns are retrieved (A row-wise database would pull
all columns and typically discard 80-95% of them)"

Is this true of PostgreSQL? That eventhough my query does not call for a
column it is still pulled from the table row(s). I know that my client via
the JDBC does not contain the data in the ResultSet for the column, because
of the packet monitoring I have done on queries.

danap

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