Partition pruning can be performed not only during the planning of a
given query, but also during its execution. This is useful as it can
allow more partitions to be pruned when clauses contain expressions
- whose values are not known at query planning time; for example,
+ whose values are not known at query planning time, for example,
parameters defined in a <command>PREPARE</command> statement, using a
- value obtained from a subquery or using a parameterized value on the
+ value obtained from a subquery, or using a parameterized value on the
inner side of a nested loop join. Partition pruning during execution
can be performed at any of the following times: