{"record":{"id":"3318321fddc7d107","repo":"prestodb/presto","slug":"table-already-exists-331832","errorCode":"TABLE_ALREADY_EXISTS","errorMessage":"Target table '%s' already exists","messagePattern":"Target table '(.+?)' already exists","errorType":"error_code","errorClass":"SemanticException","httpStatus":null,"severity":"error","filePath":"presto-main-base/src/main/java/com/facebook/presto/execution/RenameTableTask.java","lineNumber":72,"sourceCode":"        if (!tableHandle.isPresent()) {\n            if (!statement.isExists()) {\n                throw new SemanticException(MISSING_TABLE, statement, \"Table '%s' does not exist\", tableName);\n            }\n            return immediateFuture(null);\n        }\n\n        Optional<MaterializedViewDefinition> optionalMaterializedView = metadata.getMetadataResolver(session).getMaterializedView(tableName);\n        if (optionalMaterializedView.isPresent()) {\n            if (!statement.isExists()) {\n                throw new SemanticException(NOT_SUPPORTED, statement, \"'%s' is a materialized view, and rename is not supported\", tableName);\n            }\n            return immediateFuture(null);\n        }\n\n        QualifiedObjectName target = createQualifiedObjectName(session, statement, statement.getTarget(), metadata);\n        getConnectorIdOrThrow(session, metadata, target.getCatalogName(), statement, targetTableCatalogError);\n        if (metadata.getMetadataResolver(session).getTableHandle(target).isPresent()) {\n            throw new SemanticException(TABLE_ALREADY_EXISTS, statement, \"Target table '%s' already exists\", target);\n        }\n        if (!tableName.getCatalogName().equals(target.getCatalogName())) {\n            throw new SemanticException(NOT_SUPPORTED, statement, \"Table rename across catalogs is not supported\");\n        }\n        accessControl.checkCanRenameTable(session.getRequiredTransactionId(), session.getIdentity(), session.getAccessControlContext(), tableName, target);\n\n        metadata.renameTable(session, tableHandle.get(), target);\n\n        return immediateFuture(null);\n    }\n}\n","sourceCodeStart":54,"sourceCodeEnd":84,"githubUrl":"https://github.com/prestodb/presto/blob/55bb57d202de3b926896fa966c2c4a44c779634e/presto-main-base/src/main/java/com/facebook/presto/execution/RenameTableTask.java#L54-L84","documentation":"Validation in RenameTableTask.execute that checks the destination name before performing ALTER TABLE ... RENAME: a table handle is already registered for the target qualified name, so the rename would collide with an existing table.","triggerScenarios":"Thrown at presto-main-base/src/main/java/com/facebook/presto/execution/RenameTableTask.java:72 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Choose a different, unused target table name","Drop the existing target table first if it is no longer needed","Verify the intended target catalog and schema, since a same-name table may exist in another schema"],"exampleFix":null,"handlingStrategy":"validation","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"55bb57d202de3b926896fa966c2c4a44c779634e","analyzedAt":"2026-09-04T12:50:26.162Z","contentChangedAt":"2026-09-04T12:50:26.162Z","schemaVersion":2},"datasetVersion":"2026-09-11T21:17:09.523Z"}