[jOOQ/jOOQ#8950] Added JSON_ARRAY() NULL clause support

jOOQ/src/main/java/org/jooq/JSONArrayNullStep.java

@@ -0,0 +1,71 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Other licenses:
+ * -----------------------------------------------------------------------------
+ * Commercial licenses for this work are available. These replace the above
+ * ASL 2.0 and offer limited warranties, support, maintenance, and commercial
+ * database integrations.
+ *
+ * For more information, please visit: http://www.jooq.org/licenses
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ */
+package org.jooq;
+
+// ...
+// ...
+import static org.jooq.SQLDialect.H2;
+import static org.jooq.SQLDialect.MARIADB;
+import static org.jooq.SQLDialect.MYSQL;
+// ...
+import static org.jooq.SQLDialect.POSTGRES;
+// ...
+
+import org.jooq.impl.DSL;
+
+/**
+ * A step in the construction of {@link DSL#jsonArray(Field...)} or
+ * {@link DSL#jsonbArray(Field...)} functions where the <code>NULL</code> clause
+ * can be defined.
+ *
+ * @author Lukas Eder
+ */
+public interface JSONArrayNullStep<T> extends Field<T> {
+
+    /**
+     * Include <code>NULL</code> values in output JSON.
+     */
+    @Support({ H2, MARIADB, MYSQL, POSTGRES })
+    Field<T> nullOnNull();
+
+    /**
+     * Exclude <code>NULL</code> values in output JSON.
+     */
+    @Support({ H2, POSTGRES })
+    Field<T> absentOnNull();
+}

jOOQ/src/main/java/org/jooq/impl/ParserImpl.java

@@ -425,6 +425,7 @@ import org.jooq.InsertValuesStepN;
 import org.jooq.JSON;
 import org.jooq.JSONArrayAggNullStep;
 import org.jooq.JSONArrayAggOrderByStep;
+import org.jooq.JSONArrayNullStep;
 import org.jooq.JSONEntry;
 import org.jooq.JSONObjectAggNullStep;
 import org.jooq.JSONObjectNullStep;
@@ -6677,8 +6678,26 @@ final class ParserImpl implements Parser {
     }
 
     private static final Field<?> parseFieldJSONArrayConstructorIf(ParserContext ctx) {
-        if (parseKeywordIf(ctx, "JSON_ARRAY"))
-            return DSL.jsonArray(parseFieldsOrEmptyParenthesised(ctx));
+        if (parseKeywordIf(ctx, "JSON_ARRAY")) {
+            parse(ctx, '(');
+
+            List<Field<?>> result = null;
+            JSONNullClause nullClause = parseJSONObjectNullClauseIf(ctx);
+
+            if (nullClause == null) {
+                result = parseFields(ctx);
+                nullClause = parseJSONObjectNullClauseIf(ctx);
+            }
+
+            parse(ctx, ')');
+
+            JSONArrayNullStep<JSON> a = result == null ? DSL.jsonArray() : DSL.jsonArray(result);
+            return nullClause == NULL_ON_NULL
+                 ? a.nullOnNull()
+                 : nullClause == ABSENT_ON_NULL
+                 ? a.absentOnNull()
+                 : a;
+        }
 
         return null;
     }