Revert "Don't try to EXPLAIN select_db calls"

Reason: This was backported, but the test does not pass as is.

This reverts commit a33d320cf4b57fabd9c299b09c217ee3955ecc77.

2 files changed, 1 insertions, 8 deletions

diff --git a/activerecord/lib/active_record/explain_subscriber.rb b/activerecord/lib/active_record/explain_subscriber.rb
index 1d861a57db..859c8edfc5 100644
--- a/activerecord/lib/active_record/explain_subscriber.rb
+++ b/activerecord/lib/active_record/explain_subscriber.rb
@@ -15,7 +15,7 @@ module ActiveRecord
     # On the other hand, we want to monitor the performance of our real database
     # queries, not the performance of the access to the query cache.
     IGNORED_PAYLOADS = %w(SCHEMA EXPLAIN CACHE)
-    EXPLAINED_SQLS = /\A\s*(select|update|delete|insert)\b/i
+    EXPLAINED_SQLS = /\A\s*(select|update|delete|insert)/i
     def ignore_payload?(payload)
       payload[:exception] || IGNORED_PAYLOADS.include?(payload[:name]) || payload[:sql] !~ EXPLAINED_SQLS
     end
diff --git a/activerecord/test/cases/explain_subscriber_test.rb b/activerecord/test/cases/explain_subscriber_test.rb
index f929ddd79e..7b852a625d 100644
--- a/activerecord/test/cases/explain_subscriber_test.rb
+++ b/activerecord/test/cases/explain_subscriber_test.rb
@@ -38,13 +38,6 @@ if ActiveRecord::Base.connection.supports_explain?
       end
     end
 
-    def test_collects_nothing_if_the_statement_is_only_partially_matched
-      with_queries([]) do |queries|
-        SUBSCRIBER.finish(:name => 'SQL', :sql => 'select_db yo_mama')
-        assert queries.empty?
-      end
-    end
-
     def test_collects_nothing_if_unexplained_sqls
       with_queries([]) do |queries|
         SUBSCRIBER.call(:name => 'SQL', :sql => 'SHOW max_identifier_length')