Fix clear filter mistakenly in filter IN pushdown.

src/sql/engine/basic/ob_pushdown_filter.cpp

@@ -2706,10 +2706,7 @@ void PushdownFilterInfo::reset()
     }
     allocator_ = nullptr;
   }
-  if (OB_NOT_NULL(filter_)) {
-    filter_->clear();
-    filter_ = nullptr;
-  }
+  filter_ = nullptr;
   param_ = nullptr;
   context_ = nullptr;
   is_inited_ = false;

src/sql/engine/basic/ob_pushdown_filter.h

@@ -903,7 +903,7 @@ public:
   virtual void clear_in_datums()
   {
     if (WHITE_OP_IN == filter_.get_op_type()) {
-      datum_params_.reset();
+      datum_params_.clear();
       param_set_.destroy();
     }
   }