public static ConditionGroupNode?GetConditionGroupDeclaration(this ITupleOperationConditionSymbol symbol) =>
 GetDeclarationCore <ConditionGroupConditionSymbol, ConditionGroupNode>(symbol);
 public static ConditionNode?GetConditionDeclaration(this ITupleOperationConditionSymbol symbol) =>
 GetDeclarationCore <QueryConditionSymbol, ConditionNode>(symbol);