Hello. Here's the diff for the changes:

diff --git a/src/box/sql/build.c b/src/box/sql/build.c
index 92f3cb6..0287183 100644
--- a/src/box/sql/build.c
+++ b/src/box/sql/build.c
@@ -2129,18 +2129,32 @@ sqliteViewResetAll(sqlite3 * db)
  * Remove entries from the _sql_stat1 and _sql_stat4
  * system spaces after a DROP INDEX or DROP TABLE command.
  *
- * @param pParse Parsing context.
- * @param zType Type of entry to be deleted:
- * 'idx' or 'tbl' string literal.
- * @param zName Name of index or table.
+ * @param parse      The parsing context.
+ * @param table_name The table to be dropped or
+ *                   the table that contains index to be dropped.
+ * @param idx_name   Index to be dropped.
  */
 static void
-sql_clear_stat_spaces(Parse * pParse, const char *zType, const char *zName)
+sql_clear_stat_spaces(Parse *parse, const char *table_name,
+ const char *idx_name)
 {
- sqlite3NestedParse(pParse, "DELETE FROM \"_sql_stat1\" WHERE \"%s\"=%Q",
-    zType, zName);
- sqlite3NestedParse(pParse, "DELETE FROM \"_sql_stat4\" WHERE \"%s\"=%Q",
-    zType, zName);
+ if (idx_name != NULL) {
+ sqlite3NestedParse(parse,
+ "DELETE FROM \"_sql_stat1\" WHERE (\"idx\"=%Q AND "
+ "\"tbl\"=%Q)",
+ idx_name, table_name);
+ sqlite3NestedParse(parse,
+ "DELETE FROM \"_sql_stat4\" WHERE (\"idx\"=%Q AND "
+ "\"tbl\"=%Q)",
+ idx_name, table_name);
+ } else {
+ sqlite3NestedParse(parse,
+ "DELETE FROM \"_sql_stat1\" WHERE \"tbl\"=%Q",
+ table_name);
+ sqlite3NestedParse(parse,
+                    "DELETE FROM \"_sql_stat4\" WHERE \"tbl\"=%Q",
+ table_name);
+ }
 }

 /**
@@ -2325,7 +2339,7 @@ sql_drop_table(struct Parse *parse_context, struct
SrcList *table_name_list,
  *    tuple with corresponding space_id from _space.
  */

- sql_clear_stat_spaces(parse_context, "tbl", space_name);
+ sql_clear_stat_spaces(parse_context, space_name, NULL);
  struct Table *tab = sqlite3HashFind(&db->pSchema->tblHash, space_name);
  sqlite3FkDropTable(parse_context, table_name_list, tab);
  sql_code_drop_table(parse_context, space, is_view);
@@ -3328,7 +3342,7 @@ sql_drop_index(struct Parse *parse_context, struct
SrcList *index_name_list,
  * But firstly, delete statistics since schema
  * changes after DDL.
  */
- sql_clear_stat_spaces(parse_context, "idx", index->def->name);
+ sql_clear_stat_spaces(parse_context, table_name, index->def->name);
  int record_reg = ++parse_context->nMem;
  int space_id_reg = ++parse_context->nMem;
  sqlite3VdbeAddOp2(v, OP_Integer, space_id, space_id_reg);

пн, 9 апр. 2018 г. в 15:16, n.pettik <korablev@tarantool.org>:

> Hello. I have noticed that you are using 4 spaces as an indentation.
> According to our codestyle, we use tab symbol, instead of spaces,
> which is equal to 8 spaces.
>
> Also, I don’t see any point in renaming function:
> ’sql_clear_stat_spaces’ -> ’sql_clear_stat_tables’.
> I would even say that ‘spaces’ is more appropriate name,
> since stat tables in fact are Tarantool’s system spaces.
>
> diff --git a/src/box/sql/build.c b/src/box/sql/build.c
>> index 92f3cb6..7ca4191 100644
>> --- a/src/box/sql/build.c
>> +++ b/src/box/sql/build.c
>> @@ -2128,19 +2128,33 @@ sqliteViewResetAll(sqlite3 * db)
>>  /**
>>   * Remove entries from the _sql_stat1 and _sql_stat4
>>   * system spaces after a DROP INDEX or DROP TABLE command.
>> - *
>> - * @param pParse Parsing context.
>> - * @param zType Type of entry to be deleted:
>> - * 'idx' or 'tbl' string literal.
>> - * @param zName Name of index or table.
>> + *
>> + * @param parse      The parsing context.
>> + * @param table_name The table to be dropped or
>> + *                   the table that contains index to be dropped.
>> + * @param idx_name   Index to be dropped.
>>   */
>>  static void
>> -sql_clear_stat_spaces(Parse * pParse, const char *zType, const char
>> *zName)
>> +sql_clear_stat_tables(Parse *parse, const char *table_name,
>> +                      const char *idx_name)
>>  {
>> - sqlite3NestedParse(pParse, "DELETE FROM \"_sql_stat1\" WHERE
>> \"%s\"=%Q",
>> -    zType, zName);
>> - sqlite3NestedParse(pParse, "DELETE FROM \"_sql_stat4\" WHERE
>> \"%s\"=%Q",
>> -    zType, zName);
>> +    if (idx_name != NULL) {
>> +        sqlite3NestedParse(parse,
>> +                    "DELETE FROM \"_sql_stat1\" WHERE (\"idx\"=%Q AND "
>> +                    "\"tbl\"=%Q)",
>> +                    idx_name, table_name);
>> +        sqlite3NestedParse(parse,
>> +                    "DELETE FROM \"_sql_stat4\" WHERE (\"idx\"=%Q AND "
>> +                    "\"tbl\"=%Q)",
>> +                    idx_name, table_name);
>> +    } else {
>> +        sqlite3NestedParse(parse,
>> +                    "DELETE FROM \"_sql_stat1\" WHERE \"tbl\"=%Q",
>> +                    table_name);
>> +        sqlite3NestedParse(parse,
>> +                    "DELETE FROM \"_sql_stat4\" WHERE \"tbl\"=%Q",
>> +                    table_name);
>> +        }
>>  }
>>
>>
>>
>
>