From 5a233b75687644fd118054f5aafd147b86c0cb91 Mon Sep 17 00:00:00 2001
From: Lukas Eder <lukas.eder@gmail.com>
Date: Wed, 15 Apr 2020 10:39:47 +0200
Subject: [PATCH] [jOOQ/jOOQ#10060] Non-Oracle DBs cannot concatenate NULL to
 strings

---
 jOOQ/src/main/java/org/jooq/impl/JSONArrayAgg.java | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/jOOQ/src/main/java/org/jooq/impl/JSONArrayAgg.java b/jOOQ/src/main/java/org/jooq/impl/JSONArrayAgg.java
index d3392dc925..c13571bfcd 100644
--- a/jOOQ/src/main/java/org/jooq/impl/JSONArrayAgg.java
+++ b/jOOQ/src/main/java/org/jooq/impl/JSONArrayAgg.java
@@ -84,11 +84,11 @@ implements JSONArrayAggOrderByStep<J> {
 
                 // Workaround for https://jira.mariadb.org/browse/MDEV-21914
                 if (!Tools.isEmpty(withinGroupOrderBy))
-                    ctx.visit(DSL.concat(inline('['), groupConcat(arguments.get(0)).orderBy(withinGroupOrderBy), inline(']')));
+                    ctx.visit(DSL.concat(inline('['), DSL.coalesce(groupConcat(arguments.get(0)).orderBy(withinGroupOrderBy), inline("")), inline(']')));
 
                 // Workaround for https://jira.mariadb.org/browse/MDEV-21912
                 else
-                    ctx.visit(DSL.concat(inline('['), groupConcat(arguments.get(0)), inline(']')));
+                    ctx.visit(DSL.concat(inline('['), DSL.coalesce(groupConcat(arguments.get(0)), inline("")), inline(']')));
 
                 break;