[linq] Use hashtable lookup instead of linear scan for groupby keys. Fixes #18673
authorMarek Safar <marek.safar@gmail.com>
Wed, 30 Apr 2014 09:53:43 +0000 (11:53 +0200)
committerMarek Safar <marek.safar@gmail.com>
Wed, 30 Apr 2014 09:55:17 +0000 (11:55 +0200)
commitf1790decb8db018578f2ff476618aabcb110fc06
tree48cdb83110cc9ae0024269b0b4016d7dd0f2684b
parent47f76bb61ed3f775be6404504cce61f332274a7b
[linq] Use hashtable lookup instead of linear scan for groupby keys. Fixes #18673
mcs/class/System.Core/System.Linq/Enumerable.cs