MDEV-26312: Record iter methods for JOIN_CACHE_BNL #2758
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This commit creates new public methods to iterate the join cache. This is useful for engine condition pushdown in remote storage engines. In addition to push the condition, we can also push data to match rows during JOIN.
This avoids full table scan and hence full table read over the network.
Commit copied from #2176 and rebased to 11.3 to eliminate the merge commit.
Basing the PR against the correct MariaDB version