fix bug #342 (#346)

Co-authored-by: dfx <duanfuxiang>
Co-authored-by: Nmergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

storage/tianmu/core/mysql_expression.cpp

@@ -95,6 +95,7 @@ bool MysqlExpression::SanityAggregationCheck(Item *item, std::set<Item *> &field
     case Item::DECIMAL_ITEM:
     case Item::NULL_ITEM:
     case Item::VARBIN_ITEM:
+    case Item::CACHE_ITEM:
       return true;
 
     case static_cast<int>(Item_tianmufield::enumTIANMUFiledItem::TIANMUFIELD_ITEM):
@@ -336,6 +337,7 @@ Item *MysqlExpression::TransformTree(Item *root, TransformDirection dir) {
     case Item::DECIMAL_ITEM:
     case Item::NULL_ITEM:
     case Item::VARBIN_ITEM:
+    case Item::CACHE_ITEM:
       return root;
 
     default: