[GENERAL] lower() silently fails for 9.5.3 on Windows, but works on Mac, Linux

[Alexander Farber]

Hello fellow PostgreSQL users,

does anybody else observe the problem, that calling lower() method on UTF8
cyrillic strings works on Mac and Linux for version 9.5.3, but fails on
Windows 7 / 64 bit (I am using the unzippable version w/o installer)?

I am probably not providing enough information here... not sure what else
to write.

Here is my code (trying to lowercase a string before saving it in 2-dim.
array):


        FOR _tile IN SELECT * FROM JSONB_ARRAY_ELEMENTS(in_tiles)
        LOOP
                _letter :=  _tile->>'letter';
                _value  := (_tile->>'value')::int;
                _col    := (_tile->>'col')::int + 1;
                _row    := (_tile->>'row')::int + 1;

                RAISE NOTICE 'tile = %', _tile;

                IF NOT words_valid_tile(_letter,
                                        _value,
                                        _col,
                                        _row) THEN
                        RAISE EXCEPTION 'Invalid tile = %', _tile;
                END IF;

                IF (_letters[_col][_row] IS NOT NULL) THEN
                        RAISE EXCEPTION 'Cell already occupied %', _tile;
                END IF;

                _letters[_col][_row] := lower(_letter);
                RAISE NOTICE 'letter = %', _letters[_col][_row];  -- STILL
UPPERCASE
                _values[_col][_row]  := _value;

        END LOOP;

I wonder if there is a workaround for this problem on Windows

Thank you
Alex