From 36f0a4a56aef55e1f0fcc4ac50e672fe7f3ede64 Mon Sep 17 00:00:00 2001
From: Lukas Eder <lukas.eder@gmail.com>
Date: Mon, 9 Mar 2020 11:57:42 +0100
Subject: [PATCH] [jOOQ/jOOQ#9928] Added support for PostgreSQL

---
 jOOQ/src/main/java/org/jooq/JSONObjectNullStep.java | 5 +++--
 jOOQ/src/main/java/org/jooq/impl/JSONObject.java    | 7 +++++++
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/jOOQ/src/main/java/org/jooq/JSONObjectNullStep.java b/jOOQ/src/main/java/org/jooq/JSONObjectNullStep.java
index a0d85bb29e..f78ea3d71e 100644
--- a/jOOQ/src/main/java/org/jooq/JSONObjectNullStep.java
+++ b/jOOQ/src/main/java/org/jooq/JSONObjectNullStep.java
@@ -38,6 +38,7 @@
 package org.jooq;
 
 import static org.jooq.SQLDialect.H2;
+import static org.jooq.SQLDialect.POSTGRES;
 
 import org.jooq.impl.DSL;
 
@@ -53,12 +54,12 @@ public interface JSONObjectNullStep<T> extends Field<T> {
     /**
      * Include <code>NULL</code> values in output JSON.
      */
-    @Support({ H2 })
+    @Support({ H2, POSTGRES })
     Field<T> nullOnNull();
 
     /**
      * Exclude <code>NULL</code> values in output JSON.
      */
-    @Support({ H2 })
+    @Support({ H2, POSTGRES })
     Field<T> absentOnNull();
 }
diff --git a/jOOQ/src/main/java/org/jooq/impl/JSONObject.java b/jOOQ/src/main/java/org/jooq/impl/JSONObject.java
index 6e30cb9148..89c64be900 100644
--- a/jOOQ/src/main/java/org/jooq/impl/JSONObject.java
+++ b/jOOQ/src/main/java/org/jooq/impl/JSONObject.java
@@ -119,7 +119,14 @@ final class JSONObject<J> extends AbstractField<J> implements JSONObjectNullStep
 
 
             case POSTGRES:
+                if (nullClause == NullClause.ABSENT_ON_NULL)
+                    ctx.visit(unquotedName("json_strip_nulls")).sql('(');
+
                 ctx.visit(unquotedName("json_build_object")).sql('(').visit(args).sql(')');
+
+                if (nullClause == NullClause.ABSENT_ON_NULL)
+                    ctx.sql(')');
+
                 break;