[JDBC-V2] Fix Parser Issues #2579
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Client V2 CoverageCoverage Report
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Other comments (3)
- jdbc-v2/src/main/antlr4/com/clickhouse/jdbc/internal/parser/ClickHouseParser.g4 (490-490) There's a commented-out alternative in the cteUnboundCol rule (`// | LPAREN cteStmt? selectStmt RPAREN AS identifier # CteUnboundNestedSelect`). This suggests there might be an unresolved issue with handling nested selects in CTEs. Either implement this properly or remove the comment to avoid confusion.
- client-v2/src/test/java/com/clickhouse/client/datatypes/DataTypeTests.java (543-545) Consider using RoundingMode.HALF_UP or RoundingMode.HALF_EVEN instead of FLOOR for decimal comparisons. FLOOR always rounds down which might not be appropriate for all test cases, especially when dealing with financial data.
- jdbc-v2/src/test/java/com/clickhouse/jdbc/internal/SqlParserTest.java (240-240) The error message doesn't match the assertion. Consider changing to `Assert.assertFalse(stmt.isHasErrors(), "Statement has parsing errors")` for clarity.
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jdbc-v2/src/test/java/com/clickhouse/jdbc/internal/SqlParserTest.java
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jdbc-v2/src/main/antlr4/com/clickhouse/jdbc/internal/parser/antlr4/ClickHouseParser.g4
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jdbc-v2/src/main/antlr4/com/clickhouse/jdbc/internal/parser/antlr4/ClickHouseParser.g4
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AVMusorin
reviewed
Oct 10, 2025
jdbc-v2/src/test/java/com/clickhouse/jdbc/internal/BaseSqlParserFacadeTest.java
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EastLord
reviewed
Oct 13, 2025
jdbc-v2/src/main/antlr4/com/clickhouse/jdbc/internal/parser/ClickHouseParser.g4
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EastLord
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Oct 15, 2025
| | ADD PROJECTION (IF NOT EXISTS)? tableProjectionDfnt (AFTER nestedIdentifier)? # AlterTableClauseAddProjection | ||
| : ADD COLUMN (IF NOT EXISTS)? tableColumnDfnt ((AFTER nestedIdentifier) | FIRST)? # AlterTableClauseAddColumn | ||
| | ADD INDEX (IF NOT EXISTS)? tableIndexDfnt ((AFTER nestedIdentifier) | FIRST)? # AlterTableClauseAddIndex | ||
| | ADD PROJECTION (IF NOT EXISTS)? tableProjectionDfnt (AFTER (nestedIdentifier | FIRST))? # AlterTableClauseAddProjection |
EastLord
reviewed
Oct 15, 2025
| | SYSTEM DROP UNCOMPRESSED CACHE | ||
| | SYSTEM DROP COMPILED EXPRESSION CACHE | ||
| | SYSTEM DROP QUERY CONDITION CACHE | ||
| | SYSTEM DROP QUERY CACHE (TAG literal)? |
EastLord
reviewed
Oct 15, 2025
| | SYSTEM DROP MMAP CACHE | ||
| | SYSTEM DROP PAGE CACHE | ||
| | SYSTEM DROP PRIMARY INDEX CACHE | ||
| | SYSTEM DROP QUERY CACHE |
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Hello,
In ClickHouseLexer.g4, two distinct tokens are defined:
QUERY : '?';
QUERY_SQL : Q U E R Y;
However, in ClickHouseParser.g4, the rule for SYSTEM DROP ... CACHE uses the QUERY token:
SYSTEM DROP QUERY CACHE
The parser rule should be updated to use the QUERY_SQL token, which correctly represents the literal keyword.
The line should be changed from:
SYSTEM DROP QUERY CACHE
To:
SYSTEM DROP QUERY_SQL CACHE
This will ensure the grammar correctly parses the valid ClickHouse SQL syntax.
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Yes, you are right.
Thank you!
Seems I need to rename query to JDBC_PARAM
…RAM_PLACEHOLDER to avoid mistakes
EastLord
approved these changes
Oct 16, 2025
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Hello. To help identify and address any remaining gaps, I would like to propose leveraging the extensive suite of test queries directly from the official ClickHouse repository. These queries are used to test the native ClickHouse parser and represent a massive collection of valid (and invalid) SQL statements. The official test suite can be found here: https://github.com/ClickHouse/ClickHouse/tree/master/tests/queries |
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Good day, @EastLord ! Many thanks to your help and suggestions! yes, we have already run tests from this suite. However it requires porting tests to Java, there are no JDBC parameter tests what adds another dimension for tests. |
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Summary
This PR introduces option to select old JavaCC parser that is proven to work and has more relaxed rules. Parameter parsing code is ported from older version as most stable logic. And this PR will make old parser as choice by default so it will work almost like JDBC V1.
And:
Closes #2574
Closes #2568
Closes #2537
Closes #2595
Closes #2569
Closes #2570
Closes #2571
Closes #2572
Closes #2573
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