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This series fixes a bug in `appending_hash<row>` that caused it to ignore any cells after the first NULL. It also adds a cluster feature which starts using the new hashing only after the whole cluster is aware of it. The series comes with tests, which reproduce the issue.
Fixes#4567
Based on #4574
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* psarna-fix_ignoring_cells_after_null_in_appending_hash:
test: extend mutation_test for NULL values
tests/mutation: add reproducer for #4567
gms: add a cluster feature for fixed hashing
digest: add null values to row digest
mutation_partition: fix formatting
appending_hash<row>: make publicly visible
(cherry picked from commit 0e03c979d2)
fe57128fe0