code: func (b *builtinTiDBIsDDLOwnerSig) evalInt(_ chunk.Row) (res int64, isNull bool, err error) {
  	ddlOwnerChecker := b.ctx.DDLOwnerChecker()
  	if ddlOwnerChecker.IsOwner() {
  		res = 1
  	}
  
  	return res, false, nil
  }
docs: // evalInt evals a builtinTiDBIsDDLOwnerSig.