Revert "BUG#31360522 : >=5.6.36 SOME RANGE QUERIES STILL CRASH..."

This reverts commit e86c8eaa8012de53d67f4489f6c3774abdc4cdc1.

Change-Id: I1e7d58346e92ef2b36ec9dad5d8f4e6128a72c4b

Author: karthik-kamath

sql/sql_partition.cc

@@ -834,12 +834,6 @@ static bool handle_list_of_fields(List_iterator<char> it,
       for (i= 0; i < num_key_parts; i++)
       {
         Field *field= table->key_info[primary_key].key_part[i].field;
-        // BLOB/TEXT columns are not allowed in partitioning keys.
-        if (field->flags & BLOB_FLAG)
-        {
-          my_error(ER_BLOB_FIELD_IN_PART_FUNC_ERROR, MYF(0));
-          DBUG_RETURN(TRUE);
-        }
         field->flags|= GET_FIXED_FIELDS_FLAG;
       }
     }

sql/table.cc

@@ -3241,15 +3241,8 @@ int open_table_from_share(THD *thd, TABLE_SHARE *share, const char *alias,
       {
         Field *field= key_part->field= outparam->field[key_part->fieldnr-1];
 
-        /*
-          For spatial indexes, the key parts are assigned the length (4 *
-          sizeof(double)) in mysql_prepare_create_table() and the
-          field->key_length() is set to 0. This makes it appear like a prefixed
-          index. However, prefixed indexes are not allowed on Geometric columns.
-          Hence skipping new field creation for Geometric columns.
-        */
         if (field->key_length() != key_part->length &&
-            field->type() != MYSQL_TYPE_GEOMETRY)
+            !(field->flags & BLOB_FLAG))
         {
           /*
             We are using only a prefix of the column as a key: