Search where headline doesn't match

select
  o.id,
  o.dbid,
  o.type,
  o.name,
  o.display_name,
  o.short_label,
  o.full_label,
  o.description,
  o.data_source_description,
  o.sourcelink,
  o.query,
  o.all_words,
  o.rank,
  array_agg(distinct(o.words)) words
from (
  select
    i.id,
    i.dbid,
    i.type,
    i.name,
    i.display_name,
    i.short_label,
    i.full_label,
    i.description,
    i.data_source_description,
    i.sourcelink,
    i.query,
    i.all_words,
    i.rank,
    (regexp_matches(ts_headline(i.all_words, i.query, 'HighlightAll=true'), '<b>(.*?)</b>', 'g'))[1] words
  from (
    select
      case
        when column_id is not null then column_id
        when dataset_id is not null then dataset_id
        when set_id is not null then set_id
      end as id
      , id as dbid
      , type
      , coalesce (name, '') as name
      , coalesce (display_name, '') as display_name
      , coalesce (short_label, '') as short_label
      , coalesce (full_label, '') as full_label
      , coalesce (description, '') as description
      , coalesce (data_source_description, '') as data_source_description
      , coalesce (link, '') as sourcelink
      , query
      , all_words
      , ts_rank_cd (search, query) as rank
    from
      dataset_search ds
      , to_tsquery (:query) query
    where
      search @@ query
      and product_ids && :product_id
      and group_ids && :group_ids
      and type = any(:types)
    order by
      rank desc
    limit :limit
    offset :offset
  ) i
) o
group by
  o.id,
  o.dbid,
  o.type,
  o.name,
  o.display_name,
  o.short_label,
  o.full_label,
  o.description,
  o.data_source_description,
  o.sourcelink,
  o.query,
  o.all_words,
  o.rank
order by
  o.rank desc