Thirunarayanan Balathandayuthapani 1f4a901576 MDEV-36281 DML aborts during online virtual index ...

Reason:
=======
- InnoDB DML commit aborts the server when InnoDB does online
virtual index. During online DDL, concurrent DML commit
operation does read the undo log record and their related
current version of the clustered index record. Based on the
operation, InnoDB do build the old tuple and new tuple for
the table. If the concurrent online index can be affected
by the operation, InnoDB does build the entry
for the index and log the operation.

Problematic case is update operation, InnoDB does build the
update vector. But while building the old row, InnoDB fails
to fill the non-affected virtual column. This lead to
server abort while build the entry for index.

Fix:
===
- First, fill the virtual column entries for the new row.
Duplicate the old row based on new row and change only the
affected fields in old row based on the update vector.

2025-03-26 12:48:39 +01:00

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