Add 1 more column to downloads_v2 (#5861)

* Add new column 'campaign_from_event_params' to schema.yaml

* Updated query

sql/moz-fx-data-marketing-prod/ga_derived/www_site_downloads_v2/query.sql

@@ -16,6 +16,7 @@ WITH staging AS (
     campaign,
     ad_content,
     browser,
+    campaign_from_event_params,
   --note: the 2 columns are the same because in GA4, there is no logic saying you can only count 1 download per session, unlike GA3
     COUNTIF(
     --prior to and including 2/16/24
@@ -58,6 +59,16 @@ WITH staging AS (
         collected_traffic_source.manual_content AS ad_content,
         device.web_info.browser AS browser,
         event_name,
+        (
+          SELECT
+            `value`
+          FROM
+            UNNEST(event_params)
+          WHERE
+            key = 'campaign'
+          LIMIT
+            1
+        ).string_value AS campaign_from_event_params,
         (
           SELECT
             `value`
@@ -103,7 +114,8 @@ WITH staging AS (
     medium,
     campaign,
     ad_content,
-    browser
+    browser,
+    campaign_from_event_params
 )
 SELECT
   `date`,
@@ -121,6 +133,7 @@ SELECT
   medium,
   campaign,
   ad_content,
+  campaign_from_event_params,
   browser,
   download_events,
   download_events AS downloads,

sql/moz-fx-data-marketing-prod/ga_derived/www_site_downloads_v2/schema.yaml

@@ -63,6 +63,10 @@ fields:
   name: browser
   type: STRING
   description: Browser
+- mode: NULLABLE
+  name: campaign_from_event_params
+  type: STRING
+  description: Campaign - Parsed from nested event_params key = campaign
 - mode: NULLABLE
   name: download_events
   type: INT64