use an option to control input uppercase candidates or not

[stardiviner]

Here is the implementation, if you want, I can send PR:

(defcustom ejc-candidates-uppercase t
  "Use uppercase candidates or downcase.
Uppercase by default, set to nil to use downcase candidates."
  :type 'boolean
  :safe #'booleanp
  :group 'ejc-sql)

(defun ejc-get-ansi-sql-words ()
  (if (not (or (ejc-return-point) (ejc-get-prefix-word)))
      (progn
        (if ejc-candidates-uppercase
            (append (mapcar 'upcase ejc-ansi-sql-words)
                    (mapcar 'upcase ejc-auxulary-sql-words))
          (append ejc-ansi-sql-words
                  ejc-auxulary-sql-words)))
    nil))

[kostafey]

It's ok, please make a Pull request for it.

Furthermore, you can write

(unless (or (ejc-return-point) (ejc-get-prefix-word))
  ...)

instead of

(if (not (or (ejc-return-point) (ejc-get-prefix-word)))
    (progn
      ...
      )
  nil)

that's my outdated code... :)