Experiment: rowstreamer to select @@global.gtid_executed as part of sendQuery

[shlomi-noach]

EXPERIMENTAL

Description

This is an experiment to see whether we can get a transactional consistent @@gtid_executed. It's a different approach to #9991. In this experiment, we modify sendQuery to select an extra column, which is @@global.gtid_executed. Previous experiments show that the value is consistent/fixed within the transaction; what we want to validate here is that it is consistent with the transaction itself, ie that it represents the GTID value consistent with the data the transaction sees.

Related Issue(s)

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