Spanner: Automatically release session to the pool when read/query ends on single use transaction

[vkedia]

Currently in a single use transaction, when the ResultSet returned by read/executeQuery is closed or it completely iterated on (till next returns false), we release the session to the pool. This is error prone as the user might not do either.
Instead of this we should automatically free up the session when the rpc finished.

[pongad]

@vkedia Has this been worked on?

[vkedia]

Not yet.

[charlesliqlogic]

this feature seems like already exist, can you please try using latest version.

[sduskis]

I'm closing this for now. Please reopen this issue if there's anything we need to do.