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jdbc-v2: allow new ClickHouse keywords in identifier positions #3115

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jdbc-v2: allow new ClickHouse keywords in identifier positions #3115

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5 changes: 5 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -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)
- **[jdbc-v2, client-v2]** Fixes issue with `FORMAT` in query unable to override format set by client when used with
ClickHouse 26.8+. Default format is `RowBinaryWithNamesAndTypes` set at client level. For JDBC, recommend using
`format=JSONEachRow` to query JSON. Setting `format=` (empty or `null`) omits the format request header so explicit
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4 changes: 3 additions & 1 deletion jdbc-v2/src/main/java/com/clickhouse/jdbc/internal/parser/javacc/ClickHouseSqlUtils.java
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Expand Up @@ -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"
);
}

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