Re: [PR] Spark 3.5: Don't change table distribution when only altering local order [iceberg]

["manuzhang (via GitHub)" <gi...@apache.org>]

manuzhang commented on code in PR #10774:
URL: https://github.com/apache/iceberg/pull/10774#discussion_r1809013863


##########
spark/v3.5/spark-extensions/src/main/scala/org/apache/spark/sql/catalyst/parser/extensions/IcebergSqlExtensionsAstBuilder.scala:
##########
@@ -226,11 +226,13 @@ class IcebergSqlExtensionsAstBuilder(delegate: ParserInterface) extends IcebergS
     }
 
     val distributionMode = if (distributionSpec != null) {
-      DistributionMode.HASH
-    } else if (orderingSpec.UNORDERED != null || orderingSpec.LOCALLY != null) {
-      DistributionMode.NONE
+      Some(DistributionMode.HASH)
+    } else if (orderingSpec.UNORDERED != null) {

Review Comment:
   @RussellSpitzer This method is for ALTER only.
   
   https://github.com/apache/iceberg/blob/c16cefa5015dda417f80e0d59124cd92448787ab/spark/v3.5/spark-extensions/src/main/antlr/org.apache.spark.sql.catalyst.parser.extensions/IcebergSqlExtensions.g4#L73
   
   @szehon-ho The result of this method can be one of `HASH`, `NONE`, `RANGE` or unchanged depending on the combination of `distributionSpec` and `orderSpec`. Thus, we cannot just return None when `distributionSpec` is not set.
   
   



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