Support missing columns in "information_schema"."columns".

[neverchanje]

SELECT
  table_name,
  column_name,
  data_type,
  is_nullable,
  column_default,
  character_maximum_length,
  numeric_precision,
  numeric_scale,
  character_set_name,
  collation_name,
  is_identity,
  identity_start,
  identity_increment,
  generation_expression
from
  "information_schema"."columns";