Update QUERY_NAME_REGEX

Users of marginalia or other tools that can prepend content onto a SQL
statement consistently received 'mysql' as the span name because
statement type extraction required the statement to be at the
beginning of the string.

Now, the requirement for a query name to appear at the beginning of
a statement has been removed.

helpers/mysql/lib/opentelemetry/helpers/mysql.rb

@@ -36,7 +36,7 @@ class MySQL
         'create table'
       ].freeze
 
-      QUERY_NAME_REGEX = Regexp.new("^(#{QUERY_NAMES.join('|')})", Regexp::IGNORECASE)
+      QUERY_NAME_REGEX = Regexp.new("(#{QUERY_NAMES.join('|')})", Regexp::IGNORECASE)
 
       # This is a span naming utility intended for use in MySQL database
       # adapter instrumentation.

helpers/mysql/test/helpers/mysql_test.rb

@@ -93,6 +93,18 @@
       end
     end
 
+    describe 'when sql has marginalia-style prepended comments' do
+      let(:sql) do
+        '/*application:web,controller:blob,action:show,correlation_id:01EZVMR923313VV44ZJDJ7PMEZ,' \
+          'endpoint_id:Projects::BlobController#show*/ SELECT "routes".* FROM "routes" WHERE "routes"' \
+          '."source_id" = 75 AND "routes"."source_type" = \'Namespace\' LIMIT 1'
+      end
+
+      it 'finds the query name' do
+        assert_equal('select', extract_statement_type)
+      end
+    end
+
     describe 'when sql is nil' do
       let(:sql) { nil }