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update 4.0 release notes to reflect the removal of auto explain.

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1 parent 45321a6 commit 277784459f73a82581a3423d9a92477130729eb1 @senny senny committed
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  1. +2 −0  guides/source/
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@@ -200,6 +200,8 @@ Please refer to the [Changelog](
* Remove IdentityMap.
+* Remove automatic execution of EXPLAIN queries. The option `active_record.auto_explain_threshold_in_seconds` is no longer used and should be removed.
* Adds `ActiveRecord::NullRelation` and `ActiveRecord::Relation#none` implementing the null object pattern for the Relation class.
* Added `create_join_table` migration helper to create HABTM join tables.

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