Michał Chojnowski d56b0c20f4 cache_flat_mutation_reader: use the correct schema in prepare_hash ...

Since `mvcc: make schema upgrades gentle` (51e3b9321b),
rows pointed to by the cursor can have different (older) schema
than the schema of the cursor's snapshot.

However, one place in the code wasn't updated accordingly,
causing a row to be processed with the wrong schema in the right
circumstances.

This passed through unit testing because it requires
a digest-computing cache read after a schema change,
and no test exercised this.

Fixes #14110

2023-06-19 22:50:43 +02:00

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