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MDEV-16711 Crash in Field_blob::store() while reading statistics

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for the small InnoDB table

This bug was introduced by the patch 6c414fcf89.
The patch has not taken into account that some objects of the Field_* types
are created only for TABLE_SHARE and the field 'table' is set to NULL
for them. In particular such are objects created to store statistical
min/max values for columns.
This commit is contained in:
Igor Babaev
2018-07-15 18:40:25 -07:00
parent ae0eb507bd
commit b75d819604
4 changed files with 66 additions and 2 deletions
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20
mysql-test/r/stat_tables_innodb.result
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@ -566,6 +566,10 @@ SELECT * FROM mysql.column_stats;
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size hist_type histogram
test t1 pk 1 2 0.0000 4.0000 1.0000 0 NULL NULL
test t1 t bar foo 0.0000 3.0000 1.0000 0 NULL NULL
SELECT pk FROM t1;
pk
1
2
DROP TABLE t1;
set use_stat_tables=@save_use_stat_tables;
#
@ -593,5 +597,21 @@ SELECT * FROM mysql.column_stats;
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size hist_type histogram
DROP TABLE t1;
set use_stat_tables=@save_use_stat_tables;
#
# MDEV-16711:CREATE OR REPLACE TABLE introducing BLOB column
#
SET use_stat_tables= PREFERABLY;
CREATE TABLE t1 (pk INT PRIMARY KEY, t CHAR(60));
INSERT INTO t1 VALUES (1,'foo'),(2,'bar');
ANALYZE TABLE t1;
Table Op Msg_type Msg_text
test.t1 analyze status Engine-independent statistics collected
test.t1 analyze status OK
CREATE OR REPLACE TABLE t1 (pk INT PRIMARY KEY, t TEXT);
SELECT MAX(pk) FROM t1;
MAX(pk)
NULL
DROP TABLE t1;
set use_stat_tables=@save_use_stat_tables;
set optimizer_switch=@save_optimizer_switch_for_stat_tables_test;
SET SESSION STORAGE_ENGINE=DEFAULT;