Merge branch '3.8.x' into 4.0.x

* 3.8.x:
  Deprecate getting query parts from QueryBuilder

Author: derrabus

UPGRADE.md

@@ -919,6 +919,13 @@ The following methods have been removed.
 | `QueryCacheProfile` | `setResultCacheDriver()` | `setResultCache()` |
 | `QueryCacheProfile` | `getResultCacheDriver()` | `getResultCache()` |
 
+# Upgrade to 3.8
+
+## Deprecated getting query parts from `QueryBuilder`
+
+The usage of `QueryBuilder::getQueryPart()` and `::getQueryParts()` is deprecated. The query parts
+are implementation details and should not be relied upon.
+
 # Upgrade to 3.6
 
 ## Deprecated not setting a schema manager factory