Fix query rendering for signed expressions & literals.

This commit makes sure to retain signed expressions (hql, jpql) and literals (jpql) when rendering the query.
Prior to the change singed expression/literal rendering added a space between the sign and the actual value so that `-1` would become `- 1` and `-count(u)` would be `- count(u)`.
Additionally a minor glitch in the jpql rendering was resolved that would add an extra space before the closing bracket of a LENGTH expression.

See: #3342

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

@@ -24,6 +24,7 @@
  * An ANTLR {@link org.antlr.v4.runtime.tree.ParseTreeVisitor} that renders an HQL query without making any changes.
  *
  * @author Greg Turnquist
+ * @author Christoph Strobl
  * @since 3.1
  */
 class HqlQueryRenderer extends HqlBaseVisitor<List<JpaQueryParsingToken>> {
@@ -1325,7 +1326,7 @@ public List<JpaQueryParsingToken> visitSignedExpression(HqlParser.SignedExpressi
 
 		List<JpaQueryParsingToken> tokens = new ArrayList<>();
 
-		tokens.add(new JpaQueryParsingToken(ctx.op));
+		tokens.add(new JpaQueryParsingToken(ctx.op, false));
 		tokens.addAll(visit(ctx.expression()));
 
 		return tokens;

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

@@ -1468,7 +1468,7 @@ public List<JpaQueryParsingToken> visitArithmetic_factor(JpqlParser.Arithmetic_f
 		List<JpaQueryParsingToken> tokens = new ArrayList<>();
 
 		if (ctx.op != null) {
-			tokens.add(new JpaQueryParsingToken(ctx.op));
+			tokens.add(new JpaQueryParsingToken(ctx.op, false));
 		}
 		tokens.addAll(visit(ctx.arithmetic_primary()));
 
@@ -1699,6 +1699,7 @@ public List<JpaQueryParsingToken> visitFunctions_returning_numerics(
 			tokens.add(new JpaQueryParsingToken(ctx.LENGTH(), false));
 			tokens.add(TOKEN_OPEN_PAREN);
 			tokens.addAll(visit(ctx.string_expression(0)));
+			NOSPACE(tokens);
 			tokens.add(TOKEN_CLOSE_PAREN);
 		} else if (ctx.LOCATE() != null) {
 

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

@@ -33,6 +33,7 @@
  * IMPORTANT: Purely verifies the parser without any transformations.
  *
  * @author Greg Turnquist
+ * @author Christoph Strobl
  * @since 3.1
  */
 class HqlQueryRendererTests {
@@ -1651,4 +1652,13 @@ group by extract(epoch from departureTime)
 	void signedLiteralShouldWork(String query) {
 		assertQuery(query);
 	}
+
+	@ParameterizedTest // GH-3342
+	@ValueSource(strings = {
+			"select -count(u) from User u",
+			"select +1*(-count(u)) from User u"
+	})
+	void signedExpressionsShouldWork(String query) {
+		assertQuery(query);
+	}
 }

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

@@ -22,6 +22,8 @@
 import org.antlr.v4.runtime.CommonTokenStream;
 import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
 
 /**
  * Tests built around examples of JPQL found in the JPA spec
@@ -30,6 +32,7 @@
  * IMPORTANT: Purely verifies the parser without any transformations.
  *
  * @author Greg Turnquist
+ * @author Christoph Strobl
  * @since 3.1
  */
 class JpqlQueryRendererTests {
@@ -988,4 +991,27 @@ void newShouldBeLegalAsPartOfAStateFieldPathExpression() {
 	void powerShouldBeLegalInAQuery() {
 		assertQuery("select e.power.id from MyEntity e");
 	}
+
+	@ParameterizedTest // GH-3342
+	@ValueSource(strings = {
+			"select 1 as value from User u",
+			"select -1 as value from User u",
+			"select +1 as value from User u",
+			"select +1*-100 as value from User u",
+			"select count(u)*-0.7f as value from User u",
+			"select count(oi) + (-100) as perc from StockOrderItem oi",
+			"select p from Payment p where length(p.cardNumber) between +16 and -20"
+	})
+	void signedLiteralShouldWork(String query) {
+		assertQuery(query);
+	}
+
+	@ParameterizedTest // GH-3342
+	@ValueSource(strings = {
+			"select -count(u) from User u",
+			"select +1*(-count(u)) from User u"
+	})
+	void signedExpressionsShouldWork(String query) {
+		assertQuery(query);
+	}
 }