Merge pull request #3115 from ClickHouse/polyglot/jdbc-v2-new-clickhouse-keywords

jdbc-v2: allow new ClickHouse keywords in identifier positions

Author: chernser

CHANGELOG.md

@@ -153,6 +153,11 @@
 
 ### Bug Fixes 
 
+- **[jdbc-v2]** Added the non-reserved keywords `AGGREGATE`, `BOUNDED`, `EXTEND`, `HANDLER`, `IDLE`, `PROTOCOL`,
+  `RECENT`, `TIMEOUT` and `UNORDERED` (ClickHouse `26.8+`; `IDLE`, `TIMEOUT` and `RECENT` come from the multi-word
+  keywords `IDLE TIMEOUT` and `RECENT SAMPLES`) to the list of keywords allowed in identifier positions. The server
+  accepts all of them as a column or table alias, so a query using one of them as an identifier must parse.
+  (https://github.com/ClickHouse/clickhouse-java/issues/3113)
 - **[client-v2]** Fixed a query with statement parameters sent in the request body
   (`client.http.use_form_request_for_query=true`) failing with `LZ4 decompression failed ... (LZ4_DECODER_FAILED)`
   when client request compression and HTTP compression were both enabled. The multipart body is always sent

jdbc-v2/src/main/java/com/clickhouse/jdbc/internal/parser/javacc/ClickHouseSqlUtils.java

@@ -73,7 +73,9 @@ private static Set<String> initAllowedKeywordAliases() {
                 // Appended 06/26/2026
                 "ENUM", "HYPOTHETICAL", "WHATIF",
                 // Appended 07/21/2026
-                "ANALYZE", "AT", "MANIFEST", "RESERVATION"
+                "ANALYZE", "AT", "MANIFEST", "RESERVATION",
+                // Appended 09/10/2026
+                "AGGREGATE", "BOUNDED", "EXTEND", "HANDLER", "IDLE", "PROTOCOL", "RECENT", "TIMEOUT", "UNORDERED"
             );
     }