class ActiveRecord::ConnectionAdapters::PostgreSQL::ExplainPrettyPrinter

(6 rows)
Filter: (posts.user_id = 1)
-> Seq Scan on posts (cost=0.00..28.88 rows=8 width=4)
Index Cond: (id = 1)
-> Index Scan using users_pkey on users (cost=0.00..8.27 rows=1 width=4)
Join Filter: (posts.user_id = users.id)
Nested Loop Left Join (cost=0.00..37.24 rows=8 width=0)
------------------------------------------------------------------------------
QUERY PLAN

PostgreSQL shell:
Pretty prints the result of an EXPLAIN in a way that resembles the output of the
:nodoc:

def pp(result)
  header = result.columns.first
  lines  = result.rows.map(&:first)
  # We add 2 because there's one char of padding at both sides, note
  # the extra hyphens in the example above.
  width = [header, *lines].map(&:length).max + 2
  pp = []
  pp << header.center(width).rstrip
  pp << "-" * width
  pp += lines.map { |line| " #{line}" }
  nrows = result.rows.length
  rows_label = nrows == 1 ? "row" : "rows"
  pp << "(#{nrows} #{rows_label})"
  pp.join("\n") + "\n"
end