1 files changed, 37 insertions, 0 deletions
diff --git a/sql/sql_select.cc b/sql/sql_select.cc
index bb9d82a7039..3553ee78c5b 100644
--- a/sql/sql_select.cc
+++ b/sql/sql_select.cc
@@ -8296,6 +8296,11 @@ choose_plan(JOIN *join, table_map join_tables)
             jtab_sort_func, (void*)join->emb_sjm_nest);
 
   Json_writer_object wrapper(thd);
+
+  if (join->conds)
+    wrapper.add("cardinality_accurate",
+                join->conds->with_accurate_selectivity_estimation());
+
   Json_writer_array trace_plan(thd,"considered_execution_plans");
 
   if (!join->emb_sjm_nest)
@@ -29449,6 +29454,38 @@ void unpack_to_base_table_fields(TABLE *table)
 }
 
 
+
+/*
+  @brief
+    Checks if a predicate is a range predicate with a constant part
+
+  @param
+
+    @item          the item referring to the field of the table
+    @value         the item referring to the expression on the
+                   rhs of a predicate
+
+  @details
+    Range predicate is defined as the form of field op const
+    where op can be operators like </<=/=/>/>=/BETWEEN etc.
+    Also the statistics for the field should be available via
+    an index or statistical tables.
+
+  @retval
+    TRUE  : Success
+    FALSE : Otherwise
+*/
+
+bool is_range_predicate(Item *item, Item *value)
+{
+  Item *field= item->real_item();
+  if (field->type() == Item::FIELD_ITEM && !field->const_item() &&
+      (!value || !value->is_expensive()))
+    return true;
+  return false;
+}
+
+
 /**
   @} (end of group Query_Optimizer)
 */