Polishing.

Original pull request #1869

spring-data-jdbc/src/main/java/org/springframework/data/jdbc/core/convert/QueryMapper.java

@@ -32,7 +32,6 @@ import org.springframework.data.mapping.PropertyPath;
 import org.springframework.data.mapping.PropertyReferenceException;
 import org.springframework.data.mapping.context.InvalidPersistentPropertyPath;
 import org.springframework.data.mapping.context.MappingContext;
-import org.springframework.data.relational.core.dialect.Dialect;
 import org.springframework.data.relational.core.mapping.RelationalPersistentEntity;
 import org.springframework.data.relational.core.mapping.RelationalPersistentProperty;
 import org.springframework.data.relational.core.query.CriteriaDefinition;
@@ -90,8 +89,7 @@ public class QueryMapper {
 			SqlSort.validate(order);
 
 			OrderByField simpleOrderByField = createSimpleOrderByField(table, entity, order);
-			OrderByField orderBy = simpleOrderByField
-					.withNullHandling(order.getNullHandling());
+			OrderByField orderBy = simpleOrderByField.withNullHandling(order.getNullHandling());
 			mappedOrder.add(order.isAscending() ? orderBy.asc() : orderBy.desc());
 		}
 
@@ -424,7 +422,8 @@ public class QueryMapper {
 	@Nullable
 	private Object convertValue(Comparator comparator, @Nullable Object value, TypeInformation<?> typeHint) {
 
-		if ((Comparator.IN.equals(comparator) || Comparator.NOT_IN.equals(comparator)) && value instanceof Collection<?> collection && !collection.isEmpty()) {
+		if ((Comparator.IN.equals(comparator) || Comparator.NOT_IN.equals(comparator))
+				&& value instanceof Collection<?> collection && !collection.isEmpty()) {
 
 			Collection<Object> mapped = new ArrayList<>(collection.size());
 

spring-data-jdbc/src/main/java/org/springframework/data/jdbc/core/convert/SqlParametersFactory.java

@@ -26,7 +26,6 @@ import org.springframework.data.jdbc.support.JdbcUtil;
 import org.springframework.data.mapping.PersistentProperty;
 import org.springframework.data.mapping.PersistentPropertyAccessor;
 import org.springframework.data.relational.core.conversion.IdValueSource;
-import org.springframework.data.relational.core.dialect.Dialect;
 import org.springframework.data.relational.core.mapping.RelationalMappingContext;
 import org.springframework.data.relational.core.mapping.RelationalPersistentEntity;
 import org.springframework.data.relational.core.mapping.RelationalPersistentProperty;

spring-data-jdbc/src/test/java/org/springframework/data/jdbc/mybatis/MyBatisCustomizingNamespaceHsqlIntegrationTests.java

@@ -25,7 +25,6 @@ import org.apache.ibatis.session.Configuration;
 import org.apache.ibatis.session.SqlSession;
 import org.apache.ibatis.session.SqlSessionFactory;
 import org.junit.jupiter.api.Test;
-import org.junit.jupiter.api.extension.ExtendWith;
 import org.mybatis.spring.SqlSessionFactoryBean;
 import org.mybatis.spring.SqlSessionTemplate;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -42,14 +41,9 @@ import org.springframework.data.jdbc.testing.EnabledOnDatabase;
 import org.springframework.data.jdbc.testing.IntegrationTest;
 import org.springframework.data.jdbc.testing.TestClass;
 import org.springframework.data.jdbc.testing.TestConfiguration;
-import org.springframework.data.relational.core.dialect.HsqlDbDialect;
 import org.springframework.data.relational.core.mapping.RelationalMappingContext;
 import org.springframework.data.repository.CrudRepository;
 import org.springframework.jdbc.datasource.embedded.EmbeddedDatabase;
-import org.springframework.test.context.ActiveProfiles;
-import org.springframework.test.context.ContextConfiguration;
-import org.springframework.test.context.junit.jupiter.SpringExtension;
-import org.springframework.transaction.annotation.Transactional;
 
 /**
  * Tests the integration for customizing the namespace with Mybatis.

spring-data-relational/src/main/java/org/springframework/data/relational/core/conversion/RelationalConverter.java

@@ -15,16 +15,12 @@
  */
 package org.springframework.data.relational.core.conversion;
 
-import java.util.function.Function;
-
 import org.springframework.core.convert.ConversionService;
-import org.springframework.data.mapping.Parameter;
 import org.springframework.data.mapping.PersistentEntity;
 import org.springframework.data.mapping.PersistentPropertyAccessor;
 import org.springframework.data.mapping.PersistentPropertyPathAccessor;
 import org.springframework.data.mapping.context.MappingContext;
 import org.springframework.data.mapping.model.EntityInstantiators;
-import org.springframework.data.mapping.model.ParameterValueProvider;
 import org.springframework.data.projection.EntityProjection;
 import org.springframework.data.projection.EntityProjectionIntrospector;
 import org.springframework.data.relational.core.mapping.RelationalPersistentEntity;
@@ -127,5 +123,4 @@ public interface RelationalConverter {
 	@Nullable
 	Object writeValue(@Nullable Object value, TypeInformation<?> type);
 
-
 }

spring-data-relational/src/main/java/org/springframework/data/relational/core/mapping/BasicRelationalPersistentProperty.java

@@ -53,7 +53,6 @@ public class BasicRelationalPersistentProperty extends AnnotationBasedPersistent
 	private final boolean hasExplicitColumnName;
 	private final @Nullable Expression columnNameExpression;
 	private final Lazy<Optional<SqlIdentifier>> collectionIdColumnName;
-	private final @Nullable Expression collectionIdColumnNameExpression;
 	private final Lazy<SqlIdentifier> collectionKeyColumnName;
 	private final @Nullable Expression collectionKeyColumnNameExpression;
 	private final boolean isEmbedded;
@@ -98,8 +97,6 @@ public class BasicRelationalPersistentProperty extends AnnotationBasedPersistent
 				collectionIdColumnName = Lazy.of(() -> Optional.of(createSqlIdentifier(mappedCollection.idColumn())));
 			}
 
-			this.collectionIdColumnNameExpression = detectExpression(mappedCollection.idColumn());
-
 			collectionKeyColumnName = Lazy.of(
 					() -> StringUtils.hasText(mappedCollection.keyColumn()) ? createSqlIdentifier(mappedCollection.keyColumn())
 							: createDerivedSqlIdentifier(namingStrategy.getKeyColumn(this)));
@@ -107,7 +104,6 @@ public class BasicRelationalPersistentProperty extends AnnotationBasedPersistent
 			this.collectionKeyColumnNameExpression = detectExpression(mappedCollection.keyColumn());
 		} else {
 
-			this.collectionIdColumnNameExpression = null;
 			this.collectionKeyColumnNameExpression = null;
 		}