TExprNode = record
  FNext: PExprNode;
  FKind: TExprNodeKind;
  FPartial: Boolean;
  FOperator: TCANOperator;
  FData: Variant;
  FLeft: PExprNode;
  FRight: PExprNode;
  FDataType: TFieldType;
  FDataSize: Integer;
  FArgs: TList;
  FScopeKind: TExprScopeKind;
end;

struct TExprNode {
  PExprNode FNext;
  TExprNodeKind FKind;
  Boolean FPartial;
  TCANOperator FOperator;
  Variant FData;
  PExprNode FLeft;
  PExprNode FRight;
  TFieldType FDataType;
  int FDataSize;
  TList FArgs;
  TExprScopeKind FScopeKind;
};