Sergei Golubchik 633417308f MDEV-37312 ASAN errors or assertion failure upon attempt to UPDATE FOR PORTION violating long unique under READ COMMITTED ...

in case of a long unique conflict ha_write_row() used delete_row()
to remove the newly inserted row, and it used rnd_pos() to position
the cursor before deletion. This rnd_pos() was freeing and reallocating
blobs in record[0]. So when the code for FOR PORTION OF did
  store_record(record[2]);
  ha_write_row()
  restore_record(record[2]);
it ended up with blob pointers to a freed memory.

Let's use lookup_handler for deletion.

2025-07-26 10:54:28 +02:00

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