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MDEV-28131 Unexpected warning while selecting from information_schema.processlist

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Problem:

DECIMAL columns in I_S must be explicitly set of some value.

I_S columns do not have `DEFAULT 0` (after MDEV-18918), so during
restore_record() their record fragments pointed by Field::ptr are
initialized to zero bytes 0x00.
But an array of 0x00's is not a valid binary DECIMAL value.
So val_decimal() called for such Field_new_decimal generated a warning
when seeing a wrong binary encoded DECIMAL value in the record.

Fix:

Explicitly setting INFORMATION_SCHEMA.PROCESSLIST.PROGRESS
to the decimal value of 0 if no progress information is available.
This commit is contained in:
Alexander Barkov
2022-03-21 16:42:58 +04:00
parent fbc1cc974e
commit 0812d0de8d
3 changed files with 65 additions and 0 deletions
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20
mysql-test/main/processlist.result
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@ -40,3 +40,23 @@ utf8mb4_string xxx😎yyy
#
# End of 10.1 tests
#
#
# Start of 10.3 tests
#
#
# MDEV-28131 Unexpected warning while selecting from information_schema.processlist
#
connect conn1, localhost, root,,;
connection conn1;
SELECT SLEEP(1000);
connection default;
SELECT progress FROM information_schema.processlist WHERE info='SELECT SLEEP(1000)';
progress
0.000
connection conn1;
Got one of the listed errors
connection default;
disconnect conn1;
#
# End of 10.3 tests
#