While executing query on entry with a large key, gfsh automatically trims the columns width so it can fit in available width of the terminal.
In a documentation state following:
gfsh commands such as query produce output with wide columns that may become misaligned and require manual reformatting to view the output. If the output cannot fit in the available width of the terminal, gfsh automatically trims the columns widths to fit. You can disable this behavior by setting the gfsh environment variable GFSH.TRIMSCRWIDTH to false.
But this is wrong described. Only way to disable this behavior is setting gfsh environment variable APP_RESULT_VIEWER to an arbitrary value except 'external' as it enables viewing of the output using UNIX less command.