MDEV-38805:Store optimizer_context into a IS table#4675
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bsrikanth-mariadb wants to merge 1 commit into12.3-MDEV-38701-dev-sprint-work-1from
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MDEV-38805:Store optimizer_context into a IS table#4675bsrikanth-mariadb wants to merge 1 commit into12.3-MDEV-38701-dev-sprint-work-1from
bsrikanth-mariadb wants to merge 1 commit into12.3-MDEV-38701-dev-sprint-work-1from
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Currently, optimizer context is written as JSON sub-element in the Optimizer Trace. In this task, we separate it out from the optimizer trace, and instead store it in optimizer_context Information Schema table. The structure of the context is changed to look like below: - ---------------------------------- CREATE TABLE t1 ( ... ); -- in case it is a constant table REPLACE INTO t1 VALUES (...); CREATE TABLE t2 ( ... ); ... set @context='{ JSON with all the captured calls }'; set @optimizer_context='context'; ... the original query; ---------------------------------- The IS can be used to read the current stored context, as well as to dump it to a sql file which can later be replayed in a different environment. It is done like below: - -------------------------------------- set optimizer_record_context=ON; set optimizer_trace=1 -- sample query select into outfile '/tmp/captured-context.sql' context from information_schema.OPTIMIZER_CONTEXT; --------------------------------------- All the existing tests are modified to query OPTIMIZER_CONTEXT IS table
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Currently, optimizer context is written as JSON sub-element in the Optimizer Trace.
In this task, we separate it out from the optimizer trace, and instead store it in optimizer_context Information Schema table.
The structure of the context is changed to look like below:
CREATE TABLE t1 ( ... );
-- in case it is a constant table
REPLACE INTO t1 VALUES (...);
CREATE TABLE t2 ( ... );
...
set @context='{ JSON with all the captured calls }'; set @optimizer_context='context';
the original query;
The IS can be used to read the current stored context, as well as to dump it to a sql file which can later be replayed in a different environment.
It is done like below: -
set optimizer_record_context=ON;
set optimizer_trace=1
-- sample query
select into outfile '/tmp/captured-context.sql' context from information_schema.OPTIMIZER_CONTEXT;
All the existing tests are modified to query OPTIMIZER_CONTEXT IS table