fix(mep): Handle title queries (#37145)

- This fixes title queries in the MEP dataset, which were failing
  because the lhs of the condition was an AliasedExpression when the
  only accepted classes are Column, Function, CurriedFunction
- Fixes SENTRY-TNK

src/sentry/search/events/builder.py

@@ -1895,6 +1895,9 @@ class MetricsQueryBuilder(QueryBuilder):
         value = search_filter.value.value
 
         lhs = self.resolve_column(name)
+        # If this is an aliasedexpression, we don't need the alias here, just the expression
+        if isinstance(lhs, AliasedExpression):
+            lhs = lhs.exp
 
         # resolve_column will try to resolve this name with indexer, and if its a tag the Column will be tags[1]
         is_tag = isinstance(lhs, Column) and lhs.subscriptable == "tags"

tests/snuba/api/endpoints/test_organization_events_stats_mep.py

@@ -477,3 +477,28 @@ class OrganizationEventsStatsMetricsEnhancedPerformanceEndpointTest(
             },
         )
         assert response.status_code == 400, response.content
+
+    def test_title_filter(self):
+        self.store_transaction_metric(
+            123,
+            tags={"transaction": "foo_transaction"},
+            timestamp=self.day_ago + timedelta(minutes=30),
+        )
+        response = self.do_request(
+            data={
+                "start": iso_format(self.day_ago),
+                "end": iso_format(self.day_ago + timedelta(hours=2)),
+                "interval": "1h",
+                "query": "title:foo_transaction",
+                "yAxis": [
+                    "sum(transaction.duration)",
+                ],
+                "dataset": "metricsEnhanced",
+            },
+        )
+        assert response.status_code == 200, response.content
+        data = response.data["data"]
+        assert [attrs for time, attrs in data] == [
+            [{"count": 123}],
+            [{"count": 0}],
+        ]