Michał Sala f344bd0aaa cql3: statements: introduce parallelized_select_statement ...

Detect whether a statement is a count(*) query in prepare time. If so,
instantiate a new `select_statement` subclass -
`parallelized_select_statement`. This subclass has a different execution
logic, that enables it to distribute count(*) queries across a cluster.
Also, a new counter was added - `select_parallelized` that counts the
number of parallelized aggregation SELECT query executions.

2022-02-01 21:14:41 +01:00

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