diff --git a/pom.xml b/pom.xml
index f0b2a42b23..f49293315a 100644
--- a/pom.xml
+++ b/pom.xml
@@ -5,7 +5,7 @@
 
 	<groupId>org.springframework.data</groupId>
 	<artifactId>spring-data-relational-parent</artifactId>
-	<version>3.4.0-SNAPSHOT</version>
+	<version>3.4.0-1680-duplicate-column-SNAPSHOT</version>
 	<packaging>pom</packaging>
 
 	<name>Spring Data Relational Parent</name>
diff --git a/spring-data-jdbc-distribution/pom.xml b/spring-data-jdbc-distribution/pom.xml
index 4626db4364..8b001af040 100644
--- a/spring-data-jdbc-distribution/pom.xml
+++ b/spring-data-jdbc-distribution/pom.xml
@@ -14,7 +14,7 @@
 	<parent>
 		<groupId>org.springframework.data</groupId>
 		<artifactId>spring-data-relational-parent</artifactId>
-		<version>3.4.0-SNAPSHOT</version>
+		<version>3.4.0-1680-duplicate-column-SNAPSHOT</version>
 		<relativePath>../pom.xml</relativePath>
 	</parent>
 
diff --git a/spring-data-jdbc/pom.xml b/spring-data-jdbc/pom.xml
index 266af71b96..473f9924ff 100644
--- a/spring-data-jdbc/pom.xml
+++ b/spring-data-jdbc/pom.xml
@@ -6,7 +6,7 @@
 	<modelVersion>4.0.0</modelVersion>
 
 	<artifactId>spring-data-jdbc</artifactId>
-	<version>3.4.0-SNAPSHOT</version>
+	<version>3.4.0-1680-duplicate-column-SNAPSHOT</version>
 
 	<name>Spring Data JDBC</name>
 	<description>Spring Data module for JDBC repositories.</description>
@@ -15,7 +15,7 @@
 	<parent>
 		<groupId>org.springframework.data</groupId>
 		<artifactId>spring-data-relational-parent</artifactId>
-		<version>3.4.0-SNAPSHOT</version>
+		<version>3.4.0-1680-duplicate-column-SNAPSHOT</version>
 	</parent>
 
 	<properties>
diff --git a/spring-data-jdbc/src/main/java/org/springframework/data/jdbc/core/convert/RowDocumentResultSetExtractor.java b/spring-data-jdbc/src/main/java/org/springframework/data/jdbc/core/convert/RowDocumentResultSetExtractor.java
index 5d0878d4ca..bf200535d3 100644
--- a/spring-data-jdbc/src/main/java/org/springframework/data/jdbc/core/convert/RowDocumentResultSetExtractor.java
+++ b/spring-data-jdbc/src/main/java/org/springframework/data/jdbc/core/convert/RowDocumentResultSetExtractor.java
@@ -22,6 +22,8 @@
 import java.util.Iterator;
 import java.util.Map;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.springframework.dao.DataRetrievalFailureException;
 import org.springframework.data.jdbc.core.convert.RowDocumentExtractorSupport.AggregateContext;
 import org.springframework.data.jdbc.core.convert.RowDocumentExtractorSupport.RowDocumentSink;
@@ -43,6 +45,9 @@
  */
 class RowDocumentResultSetExtractor {
 
+	private static final Logger log = LoggerFactory.getLogger(RowDocumentResultSetExtractor.class);
+	public static final String DUPLICATE_COLUMN_WARNING = "ResultSet contains column \"{}\" multiple times. Later column index is {}";
+
 	private final RelationalMappingContext context;
 	private final PathToColumnMapping propertyToColumn;
 
@@ -66,9 +71,13 @@ static RowDocument toRowDocument(ResultSet resultSet) throws SQLException {
 		RowDocument document = new RowDocument(columnCount);
 
 		for (int i = 0; i < columnCount; i++) {
+
 			Object rsv = JdbcUtils.getResultSetValue(resultSet, i + 1);
 			String columnName = md.getColumnLabel(i + 1);
-			document.put(columnName, rsv instanceof Array a ? a.getArray() : rsv);
+			Object old = document.put(columnName, rsv instanceof Array a ? a.getArray() : rsv);
+			if (old != null) {
+				log.warn(DUPLICATE_COLUMN_WARNING, columnName, i);
+			}
 		}
 
 		return document;
@@ -107,7 +116,12 @@ public Map<String, Integer> getColumnMap(ResultSet result) {
 				Map<String, Integer> columns = new LinkedCaseInsensitiveMap<>(metaData.getColumnCount());
 
 				for (int i = 0; i < metaData.getColumnCount(); i++) {
-					columns.put(metaData.getColumnLabel(i + 1), i + 1);
+
+					String columnLabel = metaData.getColumnLabel(i + 1);
+					Object old = columns.put(columnLabel, i + 1);
+					if (old != null) {
+						log.warn(DUPLICATE_COLUMN_WARNING, columnLabel, i);
+					}
 				}
 				return columns;
 			} catch (SQLException e) {
diff --git a/spring-data-r2dbc/pom.xml b/spring-data-r2dbc/pom.xml
index 3168f9d4f6..74537f6986 100644
--- a/spring-data-r2dbc/pom.xml
+++ b/spring-data-r2dbc/pom.xml
@@ -6,7 +6,7 @@
 	<modelVersion>4.0.0</modelVersion>
 
 	<artifactId>spring-data-r2dbc</artifactId>
-	<version>3.4.0-SNAPSHOT</version>
+	<version>3.4.0-1680-duplicate-column-SNAPSHOT</version>
 
 	<name>Spring Data R2DBC</name>
 	<description>Spring Data module for R2DBC</description>
@@ -15,7 +15,7 @@
 	<parent>
 		<groupId>org.springframework.data</groupId>
 		<artifactId>spring-data-relational-parent</artifactId>
-		<version>3.4.0-SNAPSHOT</version>
+		<version>3.4.0-1680-duplicate-column-SNAPSHOT</version>
 	</parent>
 
 	<properties>
diff --git a/spring-data-relational/pom.xml b/spring-data-relational/pom.xml
index 0287ece743..8fcf3e4988 100644
--- a/spring-data-relational/pom.xml
+++ b/spring-data-relational/pom.xml
@@ -6,7 +6,7 @@
 	<modelVersion>4.0.0</modelVersion>
 
 	<artifactId>spring-data-relational</artifactId>
-	<version>3.4.0-SNAPSHOT</version>
+	<version>3.4.0-1680-duplicate-column-SNAPSHOT</version>
 
 	<name>Spring Data Relational</name>
 	<description>Spring Data Relational support</description>
@@ -14,7 +14,7 @@
 	<parent>
 		<groupId>org.springframework.data</groupId>
 		<artifactId>spring-data-relational-parent</artifactId>
-		<version>3.4.0-SNAPSHOT</version>
+		<version>3.4.0-1680-duplicate-column-SNAPSHOT</version>
 	</parent>
 
 	<properties>