Polishing.

Fixes copyright dates of new files to the current year.
Fixes the issue reference to use the GitHub notation.
Adds an additional test to ensure that the `ConstantConditionVisitor` doesn't need a predicate.

Original pull request #978

spring-data-relational/src/main/java/org/springframework/data/relational/core/sql/ConstantCondition.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2019-2021 the original author or authors.
+ * Copyright 2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,7 +16,7 @@
 package org.springframework.data.relational.core.sql;
 
 /**
- * {@link Condition} representing fixed sql statement
+ * {@link Condition} representing fixed sql predicate.
  *
  * @author Daniele Canteri
  * @since 2.3

spring-data-relational/src/main/java/org/springframework/data/relational/core/sql/render/ConstantConditionVisitor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2019-2021 the original author or authors.
+ * Copyright 2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

spring-data-relational/src/test/java/org/springframework/data/relational/core/sql/render/ConditionRendererUnitTests.java

@@ -22,6 +22,7 @@ import org.junit.jupiter.api.Test;
 import org.springframework.data.relational.core.sql.Column;
 import org.springframework.data.relational.core.sql.Conditions;
 import org.springframework.data.relational.core.sql.Functions;
+import org.springframework.data.relational.core.sql.SQL;
 import org.springframework.data.relational.core.sql.StatementBuilder;
 import org.springframework.data.relational.core.sql.Table;
 
@@ -232,7 +233,7 @@ public class ConditionRendererUnitTests {
 		assertThat(sql).endsWith("WHERE my_table.left NOT IN (my_table.right)");
 	}
 
-	@Test // DATAJDBC-907
+	@Test // #907
 	public void shouldRenderJust() {
 
 		String sql = SqlRenderer.toString(StatementBuilder.select(left).from(table)
@@ -241,4 +242,14 @@ public class ConditionRendererUnitTests {
 
 		assertThat(sql).endsWith("WHERE sql");
 	}
+
+	@Test // #907
+	public void shouldRenderMultipleJust() {
+
+		String sql = SqlRenderer.toString(StatementBuilder.select(left).from(table)
+				.where( Conditions.just("sql1").and(Conditions.just("sql2")))
+				.build());
+
+		assertThat(sql).endsWith("WHERE sql1 AND sql2");
+	}
 }