feat: rewrite statistics structures using generic logic, add statistics merge logic, add selectivity estimation logic basement

Виталий Шунков authored 1 year ago and Denis Smirnov committed 1 year ago

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- support parameters in form of $n like in postgres
- parameters are numbered from 1
- can't use both tarantool (?) and pg-like ($n) params
in one query

Виталий Шунков authored 1 year ago and Denis Smirnov committed 1 year ago

support kubernetes builder
fix base dockerfile
support tags in stress image dockerfile

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- refactor tracing api to take tracer
from library user. Now there is a trait
for Tracer and sbroad does really know
what tracer is being passed
- All tracing tables were moved out to Picodata
- remove tracing from cartridge:
as it is not used and no need to
maintain it

- add support for queries that use
union all operator with global tables
- for the case when global table is
used against sharded table, the global
table is materialized only on single
storage, on all other storages the
global child of union all is not
materialized

- Support groupby, aggregates and having
when the child has Global distribution:
in this case we simply don't do 2-stage
aggregation and execute everything in stage
on one node.

- subqueries reading from global tables are supported
- subqueries in queries which scan the global tables
are allowed:
`select a from global where b in (select c from segment)`

However currently using global tables in join is not
supported.

All materialized table on the storages are now fully temporary and
do not leave any records in WAL. Statistics table are left data
temporary as there is no need to recreate them on every restart.