When pressing Ctrl+C the content of the shell history gets doubled

If Ctrl+C was pressed in the impala-shell, the content of the ~/.impalahistory got copied into the end of the file for each instance the Ctrl+C was pressed.

The new queries written while the shell was open is not duplicated and the file is only updated after the impala-shell was closed.

Example:

$ rm ~/.impalahistory

$ impala-shell.sh
impala> select 1;
impala> select 2;
impala> quit;

$ cat -n ~/.impalahistory
1 select 1;
2 select 2;
3 quit;

$ impala-shell.sh
impala> ^C
impala> quit;

$ cat -n ~/.impalahistory
1 select 1;
2 select 2;
3 quit;
4 select 1;
5 select 2;
6 quit;

The second impala-shell session, Ctrl-C doubled all the history entries.