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MDEV-15955 Assertion `field_types == 0 || field_types[field_pos] == MYSQL_TYPE_LONGLONG' failed in Protocol_text::store_longlong

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This commit is contained in:
Alexander Barkov 2019-08-16 14:32:44 +04:00
parent 1217e4a0c0
commit ec1f195ecf
3 changed files with 65 additions and 0 deletions
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24
mysql-test/r/type_int.result Normal file
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@ -0,0 +1,24 @@
#
# Start of 5.5 tests
#
#
# MDEV-15955 Assertion `field_types == 0 || field_types[field_pos] == MYSQL_TYPE_LONGLONG' failed in Protocol_text::store_longlong
#
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1),(2);
SELECT @a := 1 FROM t1 ORDER BY STRCMP(STDDEV_SAMP(a), 'bar');
@a := 1
1
SELECT COALESCE(1) FROM t1 ORDER BY STRCMP(STDDEV_SAMP(a), 'bar');
COALESCE(1)
1
SELECT COALESCE(@a:=1) FROM t1 ORDER BY STRCMP(STDDEV_SAMP(a), 'bar');
COALESCE(@a:=1)
1
SELECT COALESCE(@a) FROM t1 ORDER BY STRCMP(STDDEV_SAMP(a), 'bar');
COALESCE(@a)
1
DROP TABLE t1;
#
# End of 5.5 tests
#

19
mysql-test/t/type_int.test Normal file
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@ -0,0 +1,19 @@
--echo #
--echo # Start of 5.5 tests
--echo #
--echo #
--echo # MDEV-15955 Assertion `field_types == 0 || field_types[field_pos] == MYSQL_TYPE_LONGLONG' failed in Protocol_text::store_longlong
--echo #
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1),(2);
SELECT @a := 1 FROM t1 ORDER BY STRCMP(STDDEV_SAMP(a), 'bar');
SELECT COALESCE(1) FROM t1 ORDER BY STRCMP(STDDEV_SAMP(a), 'bar');
SELECT COALESCE(@a:=1) FROM t1 ORDER BY STRCMP(STDDEV_SAMP(a), 'bar');
SELECT COALESCE(@a) FROM t1 ORDER BY STRCMP(STDDEV_SAMP(a), 'bar');
DROP TABLE t1;
--echo #
--echo # End of 5.5 tests
--echo #

22
sql/sql_select.cc
View File

@ -14762,6 +14762,28 @@ static Field *create_tmp_field_from_item(THD *thd, Item *item, TABLE *table,
if (item->cmp_type() == TIME_RESULT ||
item->field_type() == MYSQL_TYPE_GEOMETRY)
new_field= item->tmp_table_field_from_field_type(table, 1);
else if (item->type() == Item::FUNC_ITEM &&
static_cast<Item_func*>(item)->functype() == Item_func::SUSERVAR_FUNC)
{
/*
A temporary solution for versions 5.5 .. 10.3.
This change should be null-merged to 10.4.
Item_func_set_user_var is special. It overrides make_field().
by adding a special branch `if (result_field)...`.
So it's important to preserve the exact data type here,
to avoid type mismatch in Protocol_text::store_longlong()
See MDEV-15955.
Other Item_func descendants are not affected by MDEV-15955.
They don't override make_field() so they don't use result_field
when initializing Send_field.
This is properly fixed in 10.4 in the method
Item_func_user_var::create_tmp_field_ex().
*/
new_field= item->tmp_table_field_from_field_type(table, false);
}
else
switch (item->result_type()) {
case REAL_RESULT: