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.

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expr

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functions

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restrictions

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selection

cql3: selection: detect if a selection represents count(*)

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statements

cql3: statements: introduce parallelized_select_statement

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abstract_marker.cc

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query_processor.cc

cql3: statements: introduce parallelized_select_statement

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query_processor.hh

cql3: query_processor: add forward_service reference to query_processor

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stats.hh

cql3: statements: introduce parallelized_select_statement

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