cockroachdb / cockroachdb/cockroach
sql: improve observability into apply join iterations
Open
A-sql-explain
C-enhancement
T-sql-queries
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Description
Our observability into apply join iterations is limited: we show - probably incomplete - execution statistics in `plan.txt` as well as we include the DistSQL diagrams into the trace. We should improve things here, for example, we could ensure that at least SQL and KV nodes touched by each iteration are reported on `plan.txt` for the main query.
This [slack](https://cockroachlabs.slack.com/archives/C04U1BTF8/p1753918744758289) thread can show an example bundle with incomplete information.
Jira issue: CRDB-53079
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