Set database encoding to UTF8.

[zhm]

Fixes error when parsing this statement:

SELECT U&'\0441\043B\043E\043D'

The error is:

Unicode escape values cannot be used for code point values above
007F when the server encoding is not UTF8.

From here: https://github.com/postgres/postgres/blob/master/src/backend/parser/scan.l#L1236-L1247

Perhapes there could be an API to set the encoding used by the
parser. But I think it makes sense to use UTF8 by default.

[zhm]

The test statement came from http://www.postgresql.org/docs/9.0/static/sql-syntax-lexical.html

[lfittl]

Nice, good catch!

I think its safe to assume that you'd almost always want UTF-8 - until someone asks otherwise lets just default to that.