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4e9322e2ff
Raise notes if indexes cannot be used:
- in case of data type or collation mismatch (diferent error messages).
- in case if a table field was replaced to something else
(e.g. Item_func_conv_charset) during a condition rewrite.
Added option to write warnings and notes to the slow query log for
slow queries.
New variables added/changed:
- note_verbosity, with is a set of the following options:
basic - All old notes
unusable_keys - Print warnings about keys that cannot be used
for select, delete or update.
explain - Print unusable_keys warnings for EXPLAIN querys.
The default is 'basic,explain'. This means that for old installations
the only notable new behavior is that one will get notes about
unusable keys when one does an EXPLAIN for a query. One can turn all
of all notes by either setting note_verbosity to "" or setting sql_notes=0.
- log_slow_verbosity has a new option 'warnings'. If this is set
then warnings and notes generated are printed in the slow query log
(up to log_slow_max_warnings times per statement).
- log_slow_max_warnings - Max number of warnings written to
slow query log.
Other things:
- One can now use =ALL for any 'set' variable to set all options at once.
For example using "note_verbosity=ALL" in a config file or
"SET @@note_verbosity=ALL' in SQL.
- mysqldump will in the future use @@note_verbosity=""' instead of
@sql_notes=0 to disable notes.
- Added "enum class Data_type_compatibility" and changing the return type
of all Field::can_optimize*() methods from "bool" to this new data type.
Reviewer & Co-author: Alexander Barkov <bar@mariadb.com>
- The code that prints out the notes comes mainly from Alexander
66 lines
2.3 KiB
SQL
66 lines
2.3 KiB
SQL
--enable_prepare_warnings
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CREATE TABLE t2 (not_indexed_col INT);
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INSERT INTO t2 VALUES (20230101),(20230102);
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SELECT * FROM t1, t2 WHERE indexed_col=not_indexed_col;
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DROP TABLE t2;
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CREATE TABLE t2 (not_indexed_col INT UNSIGNED);
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INSERT INTO t2 VALUES (20230101),(20230102);
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SELECT * FROM t1, t2 WHERE indexed_col=not_indexed_col;
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DROP TABLE t2;
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CREATE TABLE t2 (not_indexed_col BIGINT);
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INSERT INTO t2 VALUES (20230101102030),(20230101102031);
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SELECT * FROM t1, t2 WHERE indexed_col=not_indexed_col;
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DROP TABLE t2;
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CREATE TABLE t2 (not_indexed_col BIGINT UNSIGNED);
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INSERT INTO t2 VALUES (20230101102030),(20230101102031);
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SELECT * FROM t1, t2 WHERE indexed_col=not_indexed_col;
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DROP TABLE t2;
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CREATE TABLE t2 (not_indexed_col DECIMAL(30,6));
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INSERT INTO t2 VALUES (20230101102030),(20230101102031);
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SELECT * FROM t1, t2 WHERE indexed_col=not_indexed_col;
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DROP TABLE t2;
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CREATE TABLE t2 (not_indexed_col FLOAT);
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INSERT INTO t2 VALUES (20230101102030),(20230101102031);
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SELECT * FROM t1, t2 WHERE indexed_col=not_indexed_col;
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DROP TABLE t2;
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CREATE TABLE t2 (not_indexed_col DOUBLE);
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INSERT INTO t2 VALUES (20230101102030),(20230101102031);
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SELECT * FROM t1, t2 WHERE indexed_col=not_indexed_col;
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DROP TABLE t2;
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CREATE TABLE t2 (not_indexed_col DATE);
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INSERT INTO t2 VALUES ('2023-01-01'),('2023-01-02');
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SELECT * FROM t1, t2 WHERE indexed_col=not_indexed_col;
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DROP TABLE t2;
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CREATE TABLE t2 (not_indexed_col DATETIME);
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INSERT INTO t2 VALUES ('2023-01-01 00:00:00'),('2023-01-01 00:00:01');
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SELECT * FROM t1, t2 WHERE indexed_col=not_indexed_col;
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DROP TABLE t2;
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CREATE TABLE t2 (not_indexed_col TIMESTAMP);
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INSERT INTO t2 VALUES ('2023-01-01 00:00:00'),('2023-01-01 00:00:01');
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SELECT * FROM t1, t2 WHERE indexed_col=not_indexed_col;
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DROP TABLE t2;
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CREATE TABLE t2 (not_indexed_col VARBINARY(32));
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INSERT INTO t2 VALUES (0x30),(0x31);
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SELECT * FROM t1, t2 WHERE indexed_col=not_indexed_col;
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DROP TABLE t2;
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CREATE TABLE t2 (not_indexed_col VARCHAR(32));
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INSERT INTO t2 VALUES ('2001-01-01'),('2001-01-02');
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SELECT * FROM t1, t2 WHERE indexed_col=not_indexed_col;
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DROP TABLE t2;
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CREATE TABLE t2 (not_indexed_col VARCHAR(32) CHARACTER SET utf8mb3);
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INSERT INTO t2 VALUES ('2001-01-01'),('2001-01-02');
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SELECT * FROM t1, t2 WHERE indexed_col=not_indexed_col;
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DROP TABLE t2;
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--disable_prepare_warnings
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