Upgrade to optiq-0.4.15.
diff --git a/pom.xml b/pom.xml
index 1de310d..ddd02ca 100644
--- a/pom.xml
+++ b/pom.xml
@@ -82,7 +82,7 @@
     <dependency>
       <groupId>net.hydromatic</groupId>
       <artifactId>optiq-core</artifactId>
-      <version>0.4.14</version>
+      <version>0.4.15</version>
     </dependency>
     <dependency>
       <groupId>net.hydromatic</groupId>
diff --git a/src/main/java/net/hydromatic/optiq/impl/csv/CsvTable.java b/src/main/java/net/hydromatic/optiq/impl/csv/CsvTable.java
index 395be95..aae5e76 100644
--- a/src/main/java/net/hydromatic/optiq/impl/csv/CsvTable.java
+++ b/src/main/java/net/hydromatic/optiq/impl/csv/CsvTable.java
@@ -67,10 +67,6 @@
     return schema.getQueryProvider();
   }
 
-  public DataContext getDataContext() {
-    return schema;
-  }
-
   public Class getElementType() {
     return Object[].class;
   }