(paimon) branch master updated: [lance] Reject unsupported element types nested in ARRAY (#9102)

[lzljs3620320]

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JingsongLi pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/paimon.git


The following commit(s) were added to refs/heads/master by this push:
     new 3c43be6d88 [lance] Reject unsupported element types nested in ARRAY 
(#9102)
3c43be6d88 is described below

commit 3c43be6d88feef2a0781eb8e03af412a4db9ebd8
Author: jackylee <qcsd2...@gmail.com>
AuthorDate: Mon Aug 10 16:48:43 2026 +0800

    [lance] Reject unsupported element types nested in ARRAY (#9102)
---
 .../org/apache/paimon/format/lance/LanceFileFormat.java  |  2 +-
 .../apache/paimon/format/lance/LanceFileFormatTest.java  | 16 ++++++++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git 
a/paimon-lance/src/main/java/org/apache/paimon/format/lance/LanceFileFormat.java
 
b/paimon-lance/src/main/java/org/apache/paimon/format/lance/LanceFileFormat.java
index 52184ad798..05005432b6 100644
--- 
a/paimon-lance/src/main/java/org/apache/paimon/format/lance/LanceFileFormat.java
+++ 
b/paimon-lance/src/main/java/org/apache/paimon/format/lance/LanceFileFormat.java
@@ -190,7 +190,7 @@ public class LanceFileFormat extends FileFormat {
 
         @Override
         public Void visit(ArrayType arrayType) {
-            return null;
+            return arrayType.getElementType().accept(this);
         }
 
         @Override
diff --git 
a/paimon-lance/src/test/java/org/apache/paimon/format/lance/LanceFileFormatTest.java
 
b/paimon-lance/src/test/java/org/apache/paimon/format/lance/LanceFileFormatTest.java
index ab63fc91ac..2352be764f 100644
--- 
a/paimon-lance/src/test/java/org/apache/paimon/format/lance/LanceFileFormatTest.java
+++ 
b/paimon-lance/src/test/java/org/apache/paimon/format/lance/LanceFileFormatTest.java
@@ -63,6 +63,22 @@ public class LanceFileFormatTest {
         assertThrows(UnsupportedOperationException.class, () -> 
format.validateDataFields(rowType));
     }
 
+    @Test
+    public void testValidateDataFields_UnsupportedTypeNestedInArray() {
+        LanceFileFormat format =
+                new LanceFileFormat(new FileFormatFactory.FormatContext(new 
Options(), 1024, 1024));
+        RowType rowType = 
RowType.of(DataTypes.ARRAY(DataTypes.MULTISET(DataTypes.STRING())));
+        assertThrows(UnsupportedOperationException.class, () -> 
format.validateDataFields(rowType));
+    }
+
+    @Test
+    public void testValidateDataFields_SupportedTypeNestedInArray() {
+        LanceFileFormat format =
+                new LanceFileFormat(new FileFormatFactory.FormatContext(new 
Options(), 1024, 1024));
+        RowType rowType = 
RowType.of(DataTypes.ARRAY(DataTypes.ARRAY(DataTypes.INT())));
+        assertDoesNotThrow(() -> format.validateDataFields(rowType));
+    }
+
     @Test
     public void testValidateDataFields_SupportedTypes() {
         LanceFileFormat format =