Fail duplicate import of field.

3 files changed, 21 insertions, 1 deletions

diff --git a/config-model/src/main/java/com/yahoo/searchdefinition/document/TemporaryImportedFields.java b/config-model/src/main/java/com/yahoo/searchdefinition/document/TemporaryImportedFields.java
index 11265fe70e8..a53c1b2c5ec 100644
--- a/config-model/src/main/java/com/yahoo/searchdefinition/document/TemporaryImportedFields.java
+++ b/config-model/src/main/java/com/yahoo/searchdefinition/document/TemporaryImportedFields.java
@@ -20,6 +20,8 @@ public class TemporaryImportedFields {
         fields.put(importedField.fieldName(), importedField);
     }
 
+    public boolean hasField(String fieldName) { return fields.get(fieldName) != null; }
+
     public Map<String, TemporaryImportedField> fields() {
         return Collections.unmodifiableMap(fields);
     }
diff --git a/config-model/src/main/javacc/SDParser.jj b/config-model/src/main/javacc/SDParser.jj
index a6fa472d5c4..31f81b76ea4 100644
--- a/config-model/src/main/javacc/SDParser.jj
+++ b/config-model/src/main/javacc/SDParser.jj
@@ -2453,7 +2453,11 @@ void importField(Search search) :
         int indexOfDot = fieldRefSpec.indexOf('.');
         String documentReferenceFieldName = fieldRefSpec.substring(0, indexOfDot);
         String foreignFieldName = fieldRefSpec.substring(indexOfDot + 1);
-        search.temporaryImportedFields().get().add(new TemporaryImportedField(aliasFieldName, documentReferenceFieldName, foreignFieldName));
+        TemporaryImportedFields importedFields = search.temporaryImportedFields().get();
+        if (importedFields.hasField(aliasFieldName)) {
+            throw new IllegalArgumentException("For search '" + search.getName() + "', import field as '" + aliasFieldName + "': Field already imported");
+        }
+        importedFields.add(new TemporaryImportedField(aliasFieldName, documentReferenceFieldName, foreignFieldName));
     }
 }
 
diff --git a/config-model/src/test/java/com/yahoo/searchdefinition/processing/ImportedFieldsTestCase.java b/config-model/src/test/java/com/yahoo/searchdefinition/processing/ImportedFieldsTestCase.java
index 4167e534653..536a52dd1b6 100644
--- a/config-model/src/test/java/com/yahoo/searchdefinition/processing/ImportedFieldsTestCase.java
+++ b/config-model/src/test/java/com/yahoo/searchdefinition/processing/ImportedFieldsTestCase.java
@@ -49,6 +49,20 @@ public class ImportedFieldsTestCase {
                 "}"));
     }
 
+    @Test
+    public void fail_duplicate_import() throws ParseException {
+        exception.expect(IllegalArgumentException.class);
+        exception.expectMessage("For search 'ad', import field as 'my_budget': Field already imported");
+        Search search = buildAdSearch(joinLines(
+                "search ad {",
+                "  document ad {",
+                "    field campaign_ref type reference<campaign> { indexing: attribute }",
+                "  }",
+                "  import field campaign_ref.budget as my_budget {}",
+                "  import field campaign_ref.budget as my_budget {}",
+                "}"));
+    }
+
     private static Search buildAdSearch(String sdContent) throws ParseException {
         SearchBuilder builder = new SearchBuilder();
         builder.importString(joinLines("search campaign {",