Module partition 

Structs

PartitionParams

Settings for partition_table, bundled to make it harder to accidentally put arguments in the wrong order.

Prefix 🔒

Traits

PrimaryKeyProber 🔒

Probing operations of KeyProber, as a trait so tests can substitute an in-memory implementation. See KeyProber’s methods for each operation’s contract.

Functions

children_prefixes 🔒

Splits parent into prefixes one character longer. i.e. prefix “a”, upper bound “b” in table with pks: [“a”, “ab”, “abc”, “abd”, “af”, “bb”] will return: [“ab”, “af”].

compute_boundaries 🔒

partition 🔒

partition_table

Computes up to num_workers - 1 partition boundaries that divide the primary key space into num_workers roughly even partitions. At most max_probed_prefixes prefixes are probed in MySQL to bound the time spent. Each prefix probe costs a few queries that should each be quick (index dives, instead of table scans).