test: query the empty string

test/spec/Feature/Query/QuerySpec.hs

@@ -1397,3 +1397,13 @@ spec actualPgVersion = do
         { matchStatus  = 404
         , matchHeaders = [matchContentTypeJson]
         }
+
+  context "searching for an empty string" $ do
+    it "works with an empty eq filter" $
+      get "/empty_string?string=eq.&select=id,string" `shouldRespondWith`
+        [json|
+          [{"id":1,"string":""}]
+        |]
+        { matchStatus  = 200
+        , matchHeaders = [matchContentTypeJson]
+        }

test/spec/fixtures/schema.sql

@@ -3625,3 +3625,5 @@ create aggregate test.bom_csv_agg (test.lines) (
 , sfunc = bom_csv_trans
 , finalfunc = bom_csv_final
 );
+
+create table empty_string as select 1 as id, ''::text as string;