From fc400a3ab8b0a17dbdad5b930e510329ed7b0c74 Mon Sep 17 00:00:00 2001
From: Lukas Eder <lukas.eder@datageekery.com>
Date: Wed, 10 Jul 2024 17:28:01 +0200
Subject: [PATCH] [jOOQ/jOOQ#14965] Wrong emulation of DISTINCT ON with UNION

---
 jOOQ/src/main/java/org/jooq/impl/SelectQueryImpl.java | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/jOOQ/src/main/java/org/jooq/impl/SelectQueryImpl.java b/jOOQ/src/main/java/org/jooq/impl/SelectQueryImpl.java
index ded141dbec..446bbccd29 100644
--- a/jOOQ/src/main/java/org/jooq/impl/SelectQueryImpl.java
+++ b/jOOQ/src/main/java/org/jooq/impl/SelectQueryImpl.java
@@ -3636,7 +3636,10 @@ final class SelectQueryImpl<R extends Record> extends AbstractResultQuery<R> imp
 
 
             || WRAP_EXP_BODY_IN_DERIVED_TABLE_ORDER_BY.contains(ctx.dialect()) && !getOrderBy().isEmpty()
-        );
+        )
+            // [#15189] Window functions calculated in "alternative fields" must be calculated
+            //          *after* qualify filtering has been done
+            || hasAlternativeFields && qualify.hasWhere();
     }