deniskuzZ commented on code in PR #5715:
URL: https://github.com/apache/hive/pull/5715#discussion_r2048816686
##########
iceberg/iceberg-handler/src/main/java/org/apache/iceberg/mr/hive/HiveIcebergMetaHook.java:
##########
@@ -927,6 +931,52 @@ private void
handleAddColumns(org.apache.hadoop.hive.metastore.api.Table hmsTabl
updateSchema.commit();
}
+ private void handleDropColumn(org.apache.hadoop.hive.metastore.api.Table
hmsTable) throws MetaException {
+ List<FieldSchema> hmsCols = hmsTable.getSd().getCols();
+ List<FieldSchema> icebergCols =
HiveSchemaUtil.convert(icebergTable.schema());
+
+ HiveSchemaUtil.SchemaDifference schemaDifference =
HiveSchemaUtil.getSchemaDiff(hmsCols, icebergCols, true);
+
+ if (schemaDifference.getMissingFromFirst().size() > 1) {
+ throw new MetaException("Cannot drop more than one column");
+ }
+
+ if (!schemaDifference.getMissingFromFirst().isEmpty()) {
+ schemaDifference.getMissingFromFirst().forEach(icebergCols::remove);
+ }
+
+ Pair<String, Optional<String>> outOfOrder =
HiveSchemaUtil.getReorderedColumn(
+ hmsCols, icebergCols, ImmutableMap.of());
+
+ if (!schemaDifference.getMissingFromSecond().isEmpty()) {
+ throw new MetaException("Unsupported operation to use DROP COLUMN for
adding a column");
+ }
+
+ if (!schemaDifference.getTypeChanged().isEmpty()) {
+ throw new MetaException("Unsupported operation to use DROP COLUMN for
changing a column type");
+ }
+
+ if (!schemaDifference.getCommentChanged().isEmpty()) {
+ throw new MetaException("Unsupported operation to use DROP COLUMN for
changing a column comment");
+ }
+
+ if (outOfOrder != null) {
Review Comment:
i would expect a much simple logic, similar to handleAddColumns
````
Collection<FieldSchema> removedCols =
HiveSchemaUtil.getSchemaDiff(hmsTable.getSd().getCols(),
HiveSchemaUtil.convert(icebergTable.schema()), false)
.getMissingFromSecond();
if (!emovedCols.isEmpty()) {
throw exception
}
transaction = icebergTable.newTransaction();
transaction.updateSchema()
.deleteColumn(removedCol.get(0).getName());
.commit();
}
````
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