cockroachdb / cockroachdb/cockroach
Deal with changing targets for multi-table feeds at changeFrontier/processor Start time
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Description
Currently, new tables are caught and protected when advancing the highwater. We should switch this to be done when starting up the Frontier. If we see any table mismatches when advancing the highwater, those should be assertion errors.
When relevant, deal with these in alter changefeed statements.
Jira issue: CRDB-54657
Epic CRDB-1421
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