Optional
Optional. MAY be used to provide more arbitrary, structured data to the client, e.g. cycle for CIRCULAR_REFERENCE errors.
cycle
CIRCULAR_REFERENCE
Present only for CIRCULAR_REFERENCE errors. The tables forming the detected cycle, in order (first and last entries repeated to close the loop).
Optional. MAY be used to provide more arbitrary, structured data to the client, e.g.
cycleforCIRCULAR_REFERENCEerrors.