okumin commented on code in PR #5541:
URL: https://github.com/apache/hive/pull/5541#discussion_r1875517603
##########
parser/src/java/org/apache/hadoop/hive/ql/parse/HiveParser.g:
##########
@@ -1840,6 +1841,14 @@ tableImplBuckets
-> ^(TOK_ALTERTABLE_BUCKETS $num)
;
+tableWriteOrdered
+@init { pushMsg("table sorted specification", state); }
+@after { popMsg(state); }
+ :
+ KW_WRITE KW_ORDERED KW_BY sortCols=columnNameOrderList
Review Comment:
I understand the SORT order of the Iceberg is a hint in writing.
- [Table Spec](https://iceberg.apache.org/spec/#sorting) says, "Writers
should use this default sort order to sort the data on write, but are not
required to if the default order is prohibitively expensive, as it would be for
streaming writes."
- [Spark
DDL](https://learn.microsoft.com/en-us/cli/azure/role/definition?view=azure-cli-latest#az-role-definition-list)
says, "Table write order does not guarantee data order for queries. It only
affects how data is written to the table."
- [Trino has a toggle, sorted_writing_enabled, to obey the
hint](https://trino.io/docs/current/connector/iceberg.html#iceberg-sorted-files)
So, I agree that reusing SORTED BY is confusing. I'm also checking what
syntaxes are used in other engines...
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