1.3.9+ and CJK support in sphinx.conf

[d tbsky]

Hi:
   I want to upgrade our piler from "1.3.4 + sphinx 2.2" to "1.3.9/10
+ sphinx 3.3.1".
  I notice there is a new config entry at sphinx.conf:
"SPHINX_CHARSET_TABLE".I am still confused after reading the document.
   if I already setup "ngram_len" and "ngram_chars"  as FAQ said, do I
need to change the setting of "SPHINX_CHARSET_TABLE" of piler default
to something else?
   thanks a lot for your help!!