sql/schemachanger: avoid generating event logs during EXPLAIN (DDL) #120563
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Previously, the declarative schema changer could generate event log entries even when DDL was only being explained. This created a misleading impression that schema changes had been executed. This patch modifies the declarative schema changer to prevent instant logging of events. Instead, it returns a callback that can be executed before the statement phase.
Fixes: #118897
Release note (bug fix): EXPLAIN (DDL) would generate event log entries for schema changes even though they weren't executed.