10.2 Dataset extraneous print using Transpose

Question

Bug introduced in 10.2 and fixed in 10.2 (by paclet update GeneralUtilities 10.2.1)

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This is probably patch code in 10.2. Is there a way to turn off print with Transpose?

ds = <|"k1" -> <|"a" -> 1, "b" -> 2|>, 
   "k2" -> <|"a" -> 3, "b" -> 4|>|> // Dataset

ds[Transpose]

{a,b}{k1,k2}{{1,3},{2,4}}

This only affects Dataset :

ds // Normal // Transpose // Dataset 

Answer 1

As a stop-gap, one can use Block to turn off Print:

Block[{Print}, ds[Transpose]]

Answer 2

Update

This problem has been fixed by a paclet update -- specifically version 10.2.1 of the GeneralUtilities paclet:

PacletFind["GeneralUtilities"] // PacletInformation //
  GeneralUtilities`ToAssociations // Dataset

In chat, Arnoud Buzing stated that this patch will normally be loaded automatically during the weekly paclet update. He also offered the following steps to perform the update manually:

1. Evaluate these expressions:

   PacletSiteUpdate /@ PacletSites[];
   PacletInstall /@ PacletFindRemote["WolframAutoUpdate"];
   PacletInstall /@ PacletFindRemote["GeneralUtilities"];
   

2. Quit and restart the kernel.

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Original Response

As we await a fix from WRI, we can remove the errant Print as follows:

Needs["GeneralUtilities`"]
DownValues[GeneralUtilities`AssociationTranspose] =
  DeleteCases[
    DownValues[GeneralUtilities`AssociationTranspose]
  , HoldPattern @
      Print[
        GeneralUtilities`General`PackagePrivate`ikeys
      , GeneralUtilities`General`PackagePrivate`keys
      , GeneralUtilities`General`PackagePrivate`vals
      ]
  , Infinity
  ]

Naturally, this will void your warranty...