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I execute the following SQL script with a Linux MariaDB server running with --lower-case-table-names=0:
SET GLOBAL userstat=1;
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CREATE TABLE t1 (a INT, KEY(a));
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INSERT INTO t1 VALUES (1),(2),(3),(4);
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SELECT * FROM t1 ORDER BY a;
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CREATE TABLE T1 (a INT, KEY(a));
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INSERT INTO T1 VALUES (1),(2),(3),(4);
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SELECT * FROM T1 ORDER BY a;
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+--------------+------------+-----------+--------------+------------------------+
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| TABLE_SCHEMA | TABLE_NAME | ROWS_READ | ROWS_CHANGED | ROWS_CHANGED_X_INDEXES |
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+--------------+------------+-----------+--------------+------------------------+
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| test | T1 | 1 | 1 | 1 |
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+--------------+------------+-----------+--------------+------------------------+
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Looks wrong. The statistics for t1 and T1 should have separate records.
INDEX_STATISTICS has the same problem:
SELECT * FROM INFORMATION_SCHEMA.INDEX_STATISTICS;
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+--------------+------------+------------+-----------+
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| TABLE_SCHEMA | TABLE_NAME | INDEX_NAME | ROWS_READ |
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+--------------+------------+------------+-----------+
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| test | T1 | a | 1 |
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+--------------+------------+------------+-----------+
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The problem is in these function in sql_connect.cc:
void init_global_table_stats(void)
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{
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my_hash_init(PSI_INSTRUMENT_ME, &global_table_stats, system_charset_info,
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max_connections, 0, 0, (my_hash_get_key) get_key_table_stats,
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(my_hash_free_key) free_table_stats, 0);
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}
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void init_global_index_stats(void)
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{
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my_hash_init(PSI_INSTRUMENT_ME, &global_index_stats, system_charset_info,
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max_connections, 0, 0, (my_hash_get_key) get_key_index_stats,
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(my_hash_free_key) free_index_stats, 0);
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}
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