MDEV-17734: AddressSanitizer: use-after-poison in create_key_parts_for_pseudo_indexes

In this case we were trying to access memory for key_parts which we did not
assign for a fields because it did not any EITS statistics.
The check if EITS statistics for a column is avaialable or not was missing.

Author: Varun Gupta

sql/opt_range.cc

@@ -3350,7 +3350,9 @@ bool create_key_parts_for_pseudo_indexes(RANGE_OPT_PARAM *param,
     if (bitmap_is_set(used_fields, (*field_ptr)->field_index))
     {
       Field *field= *field_ptr;
-      if (field->type() == MYSQL_TYPE_GEOMETRY)
+      Column_statistics* col_stats= field->read_stats;
+      if (field->type() == MYSQL_TYPE_GEOMETRY ||
+           !col_stats || col_stats->no_stat_values_provided())
         continue;
 
       uint16 store_length;