Select -columns doesn't preserve string as raw SQL

[Epiphero]

According to the documentation, "the argument to -columns can also be a string instead of an arrayref". Although it's not explicit, the example given implies that the string is then just raw SQL and isn't parsed. Regardless the example does use a comma, and any plain string with commas produces bad SQL. Here is an example script:

#!/usr/bin/env perl
use feature 'say';

use SQL::Abstract::More;

say SQL::Abstract::More
  ->new(quote_char => '"', name_sep => '.')
  ->select(
    -columns => 'table.a, table.b',
    -from    => [ 'table' ]
  );

The output is:

SELECT "table"."a, table"."b" FROM "table"

Note the "a, table" quoted identifier. The output should be:

SELECT table.a, table.b FROM "table"