Details
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Bug
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Status: Closed (View Workflow)
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Minor
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Resolution: Not a Bug
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1.4.2
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None
Description
Note: Possibly it's a documentation shortage (obscurity) only.
According to the KB, COLUMNSTORE_EXTENTS.STATE is Invalid if the table has not been accessed. If "table" here is the MariaDB table, it is not quite accurate. The state remains Invalid even if the table is accessed for all columns from the select list except for the first one.
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MariaDB f93bfb9288d020b190f5c73a31223fff6439687d |
MariaDB [db]> create table t1 (a int, b int, c int) engine=Columnstore; |
Query OK, 0 rows affected (0.565 sec) |
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MariaDB [db]> insert into t1 values (1,1,1); |
Query OK, 1 row affected (0.223 sec)
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MariaDB [db]> select * from information_schema.columnstore_extents; |
+-----------+-------------+---------------------+-------------------+-----------+-----------+-------+--------+--------------+------------+--------------+------------+-----------------+---------+-----------+-----------+ |
| OBJECT_ID | OBJECT_TYPE | LOGICAL_BLOCK_START | LOGICAL_BLOCK_END | MIN_VALUE | MAX_VALUE | WIDTH | DBROOT | PARTITION_ID | SEGMENT_ID | BLOCK_OFFSET | MAX_BLOCKS | HIGH_WATER_MARK | STATE | STATUS | DATA_SIZE |
|
+-----------+-------------+---------------------+-------------------+-----------+-----------+-------+--------+--------------+------------+--------------+------------+-----------------+---------+-----------+-----------+ |
| 3175 | Column | 234496 | 238591 | NULL | NULL | 4 | 1 | 0 | 0 | 0 | 4096 | 0 | Invalid | Available | 0 | |
| 3176 | Column | 238592 | 242687 | NULL | NULL | 4 | 1 | 0 | 0 | 0 | 4096 | 0 | Invalid | Available | 0 | |
| 3177 | Column | 242688 | 246783 | NULL | NULL | 4 | 1 | 0 | 0 | 0 | 4096 | 0 | Invalid | Available | 0 | |
+-----------+-------------+---------------------+-------------------+-----------+-----------+-------+--------+--------------+------------+--------------+------------+-----------------+---------+-----------+-----------+ |
3 rows in set (0.040 sec) |
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MariaDB [db]> select a, b, c from t1; |
+------+------+------+ |
| a | b | c |
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+------+------+------+ |
| 1 | 1 | 1 |
|
+------+------+------+ |
1 row in set (0.079 sec) |
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MariaDB [db]> select * from information_schema.columnstore_extents; |
+-----------+-------------+---------------------+-------------------+-----------+-----------+-------+--------+--------------+------------+--------------+------------+-----------------+---------+-----------+-----------+ |
| OBJECT_ID | OBJECT_TYPE | LOGICAL_BLOCK_START | LOGICAL_BLOCK_END | MIN_VALUE | MAX_VALUE | WIDTH | DBROOT | PARTITION_ID | SEGMENT_ID | BLOCK_OFFSET | MAX_BLOCKS | HIGH_WATER_MARK | STATE | STATUS | DATA_SIZE |
|
+-----------+-------------+---------------------+-------------------+-----------+-----------+-------+--------+--------------+------------+--------------+------------+-----------------+---------+-----------+-----------+ |
| 3175 | Column | 234496 | 238591 | 1 | 1 | 4 | 1 | 0 | 0 | 0 | 4096 | 0 | Valid | Available | 0 | |
| 3176 | Column | 238592 | 242687 | NULL | NULL | 4 | 1 | 0 | 0 | 0 | 4096 | 0 | Invalid | Available | 0 | |
| 3177 | Column | 242688 | 246783 | NULL | NULL | 4 | 1 | 0 | 0 | 0 | 4096 | 0 | Invalid | Available | 0 | |
+-----------+-------------+---------------------+-------------------+-----------+-----------+-------+--------+--------------+------------+--------------+------------+-----------------+---------+-----------+-----------+ |
3 rows in set (0.037 sec) |
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MariaDB [db]> select c, b, a from t1; |
+------+------+------+ |
| c | b | a |
|
+------+------+------+ |
| 1 | 1 | 1 |
|
+------+------+------+ |
1 row in set (0.024 sec) |
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MariaDB [db]> select * from information_schema.columnstore_extents; |
+-----------+-------------+---------------------+-------------------+-----------+-----------+-------+--------+--------------+------------+--------------+------------+-----------------+---------+-----------+-----------+ |
| OBJECT_ID | OBJECT_TYPE | LOGICAL_BLOCK_START | LOGICAL_BLOCK_END | MIN_VALUE | MAX_VALUE | WIDTH | DBROOT | PARTITION_ID | SEGMENT_ID | BLOCK_OFFSET | MAX_BLOCKS | HIGH_WATER_MARK | STATE | STATUS | DATA_SIZE |
|
+-----------+-------------+---------------------+-------------------+-----------+-----------+-------+--------+--------------+------------+--------------+------------+-----------------+---------+-----------+-----------+ |
| 3175 | Column | 234496 | 238591 | 1 | 1 | 4 | 1 | 0 | 0 | 0 | 4096 | 0 | Valid | Available | 0 | |
| 3176 | Column | 238592 | 242687 | NULL | NULL | 4 | 1 | 0 | 0 | 0 | 4096 | 0 | Invalid | Available | 0 | |
| 3177 | Column | 242688 | 246783 | 1 | 1 | 4 | 1 | 0 | 0 | 0 | 4096 | 0 | Valid | Available | 0 | |
+-----------+-------------+---------------------+-------------------+-----------+-----------+-------+--------+--------------+------------+--------------+------------+-----------------+---------+-----------+-----------+ |
3 rows in set (0.039 sec) |