Method: ClickHouse::Extend::ConnectionSelective#select_value

Defined in:
lib/click_house/extend/connection_selective.rb

#select_value(sql) ⇒ Object 



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# File 'lib/click_house/extend/connection_selective.rb', line 12

def select_value(sql)
  response = get(body: sql, query: { default_format: 'JSON' })
  got = Response::Factory.response(response, config).first

  case got
  when Hash
    Array(got).dig(0, -1) # get a value of a first key for JSON format
  when Array
    got[0] # for CSV format
  else
    got # for RowBinary format
  end
end