Fix wrong status code of case when#16042
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JackieTien97
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Jul 28, 2025
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This pull request introduces improvements to error handling and testing for CASE expressions in the IoTDB query engine. The changes ensure stricter type validation for CASE expressions and enhance test coverage for edge cases.
Enhancements to error handling:
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/relational/planner/IrTypeAnalyzer.java: ReplacedcheckArgumentwith a more descriptiveSemanticExceptionto provide clearer error messages when CASE expression result types are not consistent in bothvisitSearchedCaseExpressionandvisitSimpleCaseExpressionmethods. [1] [2]Improvements to test coverage:
integration-test/src/test/java/org/apache/iotdb/relational/it/db/it/IoTDBCaseWhenThenTableIT.java: Added a new test case to validate that CASE expressions with mixed types (e.g.,0andnull) correctly trigger an error about inconsistent result types.