mysql-util: add PK-prefix partitioner tests - #38089
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Mock-database tests for bucket assignment, empty and small tables, short exact keys among extending keys, and non-advancing prefixes, plus a live MySQL test covering EXPLAIN estimates over prepared statements, LIKE pattern semantics, and server-side validation that boundaries are strictly increasing and partition the table.
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Adds test coverage for the PK-prefix partitioner introduced in the PR below this one in the stack.
MockDb) covering the split walk: exclusive bounds, boundary assignment, phantom estimates, exact keys shorter than the probe depth, and single-prefix levels.partition_tableend to end against a real table (gated onMZ_TEST_MYSQL_URL).🤖 Generated with Claude Code