If a user searches the pdf, the first occurrence he finds is at:
43.13.2.4. Global variables and constants (in itself that occurrence/mention is all right, but is should not be the first find, I think)
(I think there was in earlier versions of the patch an entry in the 'contents', i.e., at the front of the manual). I think it would be good to have it in the front-index, pointing to either LET or CREATE VARIABLE, or maybe even to a small introductory paragraph somewhere else (again, I seem to remember that there was one in an earlier patch version).
I wrote new section to "advanced features" about schema variables
Of the new commands that this patch brings, 'LET' is the most immediately illuminating for a user (even when a CREATE VARIABLE has to be done first. There is an entry 'LET' in the index (good), but it would be better if that with LET-entry too the phrase 'schema variable' occurred. (I don't know if that's possible)
Then, in the CREATE VARIABLE paragraphs it says 'Changing a schema variable is non-transactional by default.'
I think that, unless there exists a mode where schema vars can be made transactional, 'by default' should be deleted (and there is no such 'transactional mode' for schema variables, is there?). The 'Description' also has such a 'By default' which is better removed for the same reason.
fixed
In the CREATE VARIABLE page the example is:
CREATE VARIABLE var1 AS integer; SELECT var1;
I suggest to make that
CREATE VARIABLE var1 AS date; LET var1 = (select current_date); SELECT var1;
So that the example immediately shows an application of functionality.
