feat: optimise query for determining latest verification for consumer…

… and provider

db/ddl_statements/latest_verification_ids_for_consumer_and_provider.rb

@@ -0,0 +1,25 @@
+LATEST_VERIFICATION_IDS_FOR_CONSUMER_AND_PROVIDER_V1 = "select
+        pv.pacticipant_id as provider_id,
+        lpp.consumer_id,
+        max(v.id) as latest_verification_id
+      from verifications v
+      join latest_pact_publications_by_consumer_versions lpp
+        on v.pact_version_id = lpp.pact_version_id
+      join versions pv
+        on v.provider_version_id = pv.id
+      group by pv.pacticipant_id, lpp.consumer_id"
+
+LATEST_VERIFICATION_IDS_FOR_CONSUMER_AND_PROVIDER_V2 = "select
+        provider_id,
+        consumer_id,
+        max(id) as latest_verification_id
+        from verifications v
+        group by provider_id, consumer_id"
+
+
+LATEST_VERIFICATION_IDS_FOR_CONSUMER_AND_PROVIDER_V3 = "select
+        provider_id,
+        consumer_id,
+        max(verification_id) as latest_verification_id
+        from latest_verification_id_for_pact_version_and_provider_version v
+        group by provider_id, consumer_id"

db/migrations/20180524_create_latest_verifications_for_consumer_and_provider.rb

@@ -1,17 +1,10 @@
+require_relative '../ddl_statements/latest_verification_ids_for_consumer_and_provider'
+
 Sequel.migration do
   up do
-    # The latest verification id for each consumer version tag
+    # The latest verification id for each consumer/provider
     create_view(:latest_verification_ids_for_consumer_and_provider,
-      "select
-        pv.pacticipant_id as provider_id,
-        lpp.consumer_id,
-        max(v.id) as latest_verification_id
-      from verifications v
-      join latest_pact_publications_by_consumer_versions lpp
-        on v.pact_version_id = lpp.pact_version_id
-      join versions pv
-        on v.provider_version_id = pv.id
-      group by pv.pacticipant_id, lpp.consumer_id")
+      LATEST_VERIFICATION_IDS_FOR_CONSUMER_AND_PROVIDER_V1)
 
     # The most recent verification for each consumer/consumer version tag/provider
     latest_verifications = from(:verifications)

db/migrations/20180614_update_latest_verification_ids_for_consumer_and_provider.rb

@@ -1,27 +1,15 @@
+require_relative '../ddl_statements/latest_verification_ids_for_consumer_and_provider'
+
 Sequel.migration do
   up do
-    # The latest verification id for each consumer version tag
+    # The latest verification id for each consumer/provider
     create_or_replace_view(:latest_verification_ids_for_consumer_and_provider,
-      "select
-        provider_id,
-        consumer_id,
-        max(id) as latest_verification_id
-        from verifications v
-        group by provider_id, consumer_id")
+          LATEST_VERIFICATION_IDS_FOR_CONSUMER_AND_PROVIDER_V2)
   end
 
   down do
-    # The latest verification id for each consumer version tag
+    # The latest verification id for each consumer/provider
     create_or_replace_view(:latest_verification_ids_for_consumer_and_provider,
-      "select
-        pv.pacticipant_id as provider_id,
-        lpp.consumer_id,
-        max(v.id) as latest_verification_id
-      from verifications v
-      join latest_pact_publications_by_consumer_versions lpp
-        on v.pact_version_id = lpp.pact_version_id
-      join versions pv
-        on v.provider_version_id = pv.id
-      group by pv.pacticipant_id, lpp.consumer_id")
+      LATEST_VERIFICATION_IDS_FOR_CONSUMER_AND_PROVIDER_V1)
   end
 end

db/migrations/20201026_update_latest_verification_ids_for_consumer_and_provider.rb

@@ -0,0 +1,14 @@
+require_relative 'migration_helper'
+require_relative '../ddl_statements/latest_verification_ids_for_consumer_and_provider'
+
+Sequel.migration do
+  up do
+    create_or_replace_view(:latest_verification_ids_for_consumer_and_provider,
+      LATEST_VERIFICATION_IDS_FOR_CONSUMER_AND_PROVIDER_V3)
+  end
+
+  down do
+    create_or_replace_view(:latest_verification_ids_for_consumer_and_provider,
+      LATEST_VERIFICATION_IDS_FOR_CONSUMER_AND_PROVIDER_V2)
+  end
+end