Add support for JPA 3.2 additions to JPQL.

See #3136.

Author: gregturn

spring-data-jpa/src/main/antlr4/org/springframework/data/jpa/repository/query/Jpql.g4

@@ -428,6 +428,7 @@ string_expression
     | aggregate_expression
     | case_expression
     | function_invocation
+    | string_expression '||' string_expression
     | '(' subquery ')'
     ;
 

spring-data-jpa/src/main/java/org/springframework/data/jpa/repository/query/JpqlQueryRenderer.java

@@ -1527,6 +1527,11 @@ public List<JpaQueryParsingToken> visitString_expression(JpqlParser.String_expre
 			tokens.addAll(visit(ctx.case_expression()));
 		} else if (ctx.function_invocation() != null) {
 			tokens.addAll(visit(ctx.function_invocation()));
+		} else if (ctx.string_expression() != null) {
+
+			tokens.addAll(visit(ctx.string_expression(0)));
+			tokens.add(new JpaQueryParsingToken("||"));
+			tokens.addAll(visit(ctx.string_expression(1)));
 		} else if (ctx.subquery() != null) {
 
 			tokens.add(TOKEN_OPEN_PAREN);

spring-data-jpa/src/test/java/org/springframework/data/jpa/repository/query/HqlQueryRendererTests.java

@@ -1600,4 +1600,14 @@ void newShouldBeLegalAsPartOfAStateFieldPathExpression() {
 				ORDER BY j.id
 				""");
 	}
+
+	@Test // GH-3136
+	void doublePipeShouldBeValidAsAStringConcatOperator() {
+
+		assertQuery("""
+				select e.name || ' ' || e.title
+				from Employee e
+				""");
+	}
+
 }

spring-data-jpa/src/test/java/org/springframework/data/jpa/repository/query/JpqlQueryRendererTests.java

@@ -983,4 +983,13 @@ void newShouldBeLegalAsPartOfAStateFieldPathExpression() {
 				ORDER BY j.id
 				""");
 	}
+
+	@Test // GH-3136
+	void doublePipeShouldBeValidAsAStringConcatOperator() {
+
+		assertQuery("""
+				select e.name || ' ' || e.title
+				from Employee e
+				""");
+	}
 }