Re: [PATCH v2] merge-recursive: change current file dir string_lists to hashmap

> The code was using two string_lists, one for the directories and
> one for the files.  The code never checks the lists independently
> so we should be able to only use one list.  The string_list also
> is a O(log n) for lookup and insertion.  Switching this to use a
> hashmap will give O(1) which will save some time when there are
> millions of paths that will be checked.
>
> Also cleaned up a memory leak and method where the return was not
> being used.
>
> Signed-off-by: Kevin Willford <kewillf@microsoft.com>
> ---
>  merge-recursive.c | 76 ++++++++++++++++++++++++++++++++++++++++---------------
>  merge-recursive.h |  3 +--
>  2 files changed, 57 insertions(+), 22 deletions(-)
>
> diff --git a/merge-recursive.c b/merge-recursive.c
> index 1494ffdb82..ebfe01017f 100644
> --- a/merge-recursive.c
> +++ b/merge-recursive.c
> @@ -24,6 +24,31 @@
>  #include "dir.h"
>  #include "submodule.h"
>  
> +struct path_hashmap_entry {
> +	struct hashmap_entry;