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Added a fix for column rename in IcebergSchemaSync #712

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Added a fix for column rename in IcebergSchemaSync #712

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baf9ed5
Added a fix for column rename in IcebergSchemaSync
May 9, 2025
606c863
Added a fix for column rename in IcebergSchemaSync
May 9, 2025
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22 changes: 15 additions & 7 deletions xtable-core/src/main/java/org/apache/xtable/iceberg/IcebergSchemaSync.java
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Original file line number Diff line number Diff line change
Expand Up @@ -74,12 +74,12 @@ private static Map<Integer, Supplier<UpdateSchema>> addUpdates(
UpdateSchema updateSchema,
String parentPath) {
Map<Integer, Supplier<UpdateSchema>> updates = new HashMap<>();
Set<String> allColumnNames = new HashSet<>();
current.fields().stream().map(Types.NestedField::name).forEach(allColumnNames::add);
latest.fields().stream().map(Types.NestedField::name).forEach(allColumnNames::add);
for (String columnName : allColumnNames) {
Types.NestedField latestColumn = latest.field(columnName);
Types.NestedField currentColumn = current.field(columnName);
Set<Integer> allColumnFieldIds = new HashSet<>();
current.fields().stream().map(Types.NestedField::fieldId).forEach(allColumnFieldIds::add);
latest.fields().stream().map(Types.NestedField::fieldId).forEach(allColumnFieldIds::add);
for (int columnFieldId : allColumnFieldIds) {
Types.NestedField latestColumn = latest.field(columnFieldId);
Types.NestedField currentColumn = current.field(columnFieldId);
if (currentColumn == null) {
// add a new column
if (latestColumn.isOptional()) {
Expand All @@ -99,7 +99,9 @@ private static Map<Integer, Supplier<UpdateSchema>> addUpdates(
// drop the existing column, use fieldId 0 to perform deletes first
updates.put(
0,
() -> updateSchema.deleteColumn(constructFullyQualifiedName(columnName, parentPath)));
() ->
updateSchema.deleteColumn(
constructFullyQualifiedName(currentColumn.name(), parentPath)));
} else {
updates.putAll(updateColumn(latestColumn, currentColumn, updateSchema, parentPath));
}
Expand All @@ -123,6 +125,12 @@ private static Map<Integer, Supplier<UpdateSchema>> updateColumn(
updateSchema.updateColumn(
latestColumn.name(), latestColumn.type().asPrimitiveType()));
}
// update the name of the column
if (!latestColumn.name().equals(currentColumn.name())) {
updates.put(
latestColumn.fieldId(),
() -> updateSchema.renameColumn(currentColumn.name(), latestColumn.name()));
}
// update whether the column is required
if (latestColumn.isOptional() != currentColumn.isOptional()) {
if (latestColumn.isOptional()) {
Expand Down
27 changes: 27 additions & 0 deletions xtable-core/src/test/java/org/apache/xtable/iceberg/TestIcebergSchemaSync.java
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Expand Up @@ -335,6 +335,33 @@ void testAddMapFieldComment() {
verify(mockUpdateSchema).commit();
}

@Test
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Can we add a unit test which writes an actual iceberg table to a tempDir path? There are many examples in ITConversionController to follow from.

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I will take a look and will add it @vinishjail97

public void testUpdateColumnName() {
UpdateSchema mockUpdateSchema = Mockito.mock(UpdateSchema.class);
when(mockTransaction.updateSchema()).thenReturn(mockUpdateSchema);
schemaSync.sync(SCHEMA, updateColumnName(2), mockTransaction);

verify(mockUpdateSchema).renameColumn(SCHEMA.findColumnName(2), "updateColumnName");
verify(mockUpdateSchema).commit();
}

private Schema updateColumnName(int fieldId) {
List<Types.NestedField> fields = new ArrayList<>();
for (Types.NestedField existingField : SCHEMA.columns()) {
if (existingField.fieldId() == fieldId) {
fields.add(
Types.NestedField.of(
existingField.fieldId(),
existingField.isOptional(),
"updateColumnName",
existingField.type()));
} else {
fields.add(existingField);
}
}
return new Schema(fields);
}

private Schema addColumnToDefault(Schema schema, Types.NestedField field, Integer parentId) {
List<Types.NestedField> fields = new ArrayList<>();
for (Types.NestedField existingField : schema.columns()) {
Expand Down
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