system.indexes

引入版本：v1.1.50

包含有关创建的聚合索引的信息。

另见：SHOW INDEXES

CREATE TABLE t1(a int,b int);

CREATE AGGREGATING INDEX idx1 AS SELECT SUM(a), b FROM default.t1 WHERE b > 3 GROUP BY b；

SELECT * FROM system.indexes；

+----------+-------------+------------------------------------------------------------+----------------------------+
| name     | type        | definition                                                 | created_on                 |
+----------+-------------+------------------------------------------------------------+----------------------------+
| test_idx | AGGREGATING | SELECT b, SUM(a) FROM default.t1 WHERE (b > 3) GROUP BY b  | 2023-05-17 11:53:54.474377 |
+----------+-------------+------------------------------------------------------------+----------------------------+