{"id":"4b122cf43ec1b575","repo":"jackc/pgx","slug":"number-of-field-descriptions-must-equal-number-of-4b122c","errorCode":null,"errorMessage":"number of field descriptions must equal number of destinations, got %d and %d","messagePattern":"number of field descriptions must equal number of destinations, got (.+?) and (.+?)","errorType":"validation","errorClass":null,"httpStatus":null,"severity":"error","filePath":"rows.go","lineNumber":257,"sourceCode":"\n\tif len(fieldDescriptions) != len(values) {\n\t\terr := fmt.Errorf(\"number of field descriptions must equal number of values, got %d and %d\", len(fieldDescriptions), len(values))\n\t\trows.fatal(err)\n\t\treturn err\n\t}\n\n\tif len(dest) == 1 {\n\t\tif rc, ok := dest[0].(RowScanner); ok {\n\t\t\terr := rc.ScanRow(rows)\n\t\t\tif err != nil {\n\t\t\t\trows.fatal(err)\n\t\t\t}\n\t\t\treturn err\n\t\t}\n\t}\n\n\tif len(fieldDescriptions) != len(dest) {\n\t\terr := fmt.Errorf(\"number of field descriptions must equal number of destinations, got %d and %d\", len(fieldDescriptions), len(dest))\n\t\trows.fatal(err)\n\t\treturn err\n\t}\n\n\tif rows.scanPlans == nil {\n\t\trows.scanPlans = make([]pgtype.ScanPlan, len(values))\n\t\trows.scanTypes = make([]reflect.Type, len(values))\n\t\tfor i := range dest {\n\t\t\trows.scanPlans[i] = m.PlanScan(fieldDescriptions[i].DataTypeOID, fieldDescriptions[i].Format, dest[i])\n\t\t\trows.scanTypes[i] = reflect.TypeOf(dest[i])\n\t\t}\n\t}\n\n\tfor i, dst := range dest {\n\t\tif dst == nil {\n\t\t\tcontinue\n\t\t}\n","sourceCodeStart":239,"sourceCodeEnd":275,"githubUrl":"https://github.com/jackc/pgx/blob/ec1a0befd22592cffffdeeb0a50311b506372f4c/rows.go#L239-L275","documentation":"Error \"number of field descriptions must equal number of destinations, got %d and %d\" thrown in jackc/pgx.","triggerScenarios":"Thrown at rows.go:257 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":[],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"analyzedSha":"ec1a0befd22592cffffdeeb0a50311b506372f4c","analyzedAt":"2026-08-04T22:52:11.263Z","schemaVersion":2}