soumyakanti3578 commented on code in PR #5715:
URL: https://github.com/apache/hive/pull/5715#discussion_r2021873050
##########
iceberg/iceberg-handler/src/main/java/org/apache/iceberg/mr/hive/HiveIcebergMetaHook.java:
##########
@@ -927,6 +931,44 @@ 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().isEmpty()) {
+ schemaDifference.getMissingFromFirst().forEach(icebergCols::remove);
+ }
+
+ Pair<String, Optional<String>> outOfOrder =
HiveSchemaUtil.getReorderedColumn(
+ hmsCols, icebergCols, ImmutableMap.of());
+
+ if (schemaDifference.getMissingFromFirst().size() > 1) {
+ throw new MetaException("Cannot drop more than one column");
+ }
+
+ if (!schemaDifference.getMissingFromSecond().isEmpty() ||
!schemaDifference.getTypeChanged().isEmpty() ||
+ !schemaDifference.getCommentChanged().isEmpty() || outOfOrder !=
null) {
+ throw new MetaException("Unsupported operation to use DROP COLUMN for
adding a column, changing a " +
+ "column type, column comment or reordering columns. Only use
DROP COLUMN for dropping a column. " +
+ "For the other operations, consider using the ADD COLUMNS or
CHANGE COLUMN commands.");
+ }
Review Comment:
It looks like this Exception is handling too many scenarios. It might be
alright but this could be broken into more specific scenarios. What do you
think?
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