Add support for CloudTable.ExecuteQueryAsync

[zsmorris]

An ExecuteQueryAsync method on CloudTable would be very helpful.

ExecuteQuerySegmentedAsync exists but not as handy as ExecuteQuery. Something like https://github.com/glueckkanja/tasync/blob/master/StorageExtensions.cs but with full support for all query options (like Take).

[jharidas]

This is not considered best practice. Essentially to execute an entire query asynchronously would mean to follow all subsequent continuation tokens and store all resulting data in memory. In Azure Tables this could potentially mean 200 TB of data which is not practical. Once could conceivably create a helper method that simply executes N segmented operations until a given number of entities are returned, and such a method is simple enough do (i.e. an extension method ExecuteQueryForN) We will investigate possible alternatives in upcoming releases of the storage client library.

[zsmorris]

Understood. But there's ultimately really no way to protect people from themselves, and having to write continuation logic all the time is a waste of time. Maybe just add a 'max entities to return' parameter to ExecuteQueryAsync, as you mentioned?

[jharidas]

We are going to take this as a feature request and investigate for a future release.

[Cheesebaron]

Almost a year has passed and still nothing? Could you reconsider this?

[christav]

@Cheesebaron Azure storage library code and comments are at https://github.com/Azure/azure-storage-net. Could you open this discussion there?