Re: [PATCH 01/10] reftable/merged: expose functions to initialize iterators

> We do not expose any functions via our public headers that would allow a
> caller to initialize a reftable iterator from a merged table. Instead,
> they are expected to go via the generic `reftable_table` interface,
> which is somewhat roundabout.
> 
> Implement two new functions to initialize iterators for ref and log
> records to plug this gap.
> 
> Signed-off-by: Patrick Steinhardt <ps@pks.im>
> ---

> diff --git a/reftable/reftable-merged.h b/reftable/reftable-merged.h
> index 14d5fc9f05..4deb0ad22e 100644
> --- a/reftable/reftable-merged.h
> +++ b/reftable/reftable-merged.h
> @@ -36,6 +36,14 @@ int reftable_new_merged_table(struct reftable_merged_table **dest,
>  			      struct reftable_table *stack, size_t n,
>  			      uint32_t hash_id);
>  
> +/* Initialize a merged table iterator for reading refs. */
> +void reftable_merged_table_init_ref_iterator(struct reftable_merged_table *mt,
> +					     struct reftable_iterator *it);
> +
> +/* Initialize a merged table iterator for reading logs. */
> +void reftable_merged_table_init_log_iterator(struct reftable_merged_table *mt,
> +					     struct reftable_iterator *it);