roachtest: sqlsmith decoding unset EncDatum

[cockroach-teamcity]

(roachtest).sqlsmith/setup=seed/setting=no-mutations failed on release-20.1@6123c0c73ff0eea223cfd25e1e557648413126f8:

The test failed on branch=release-20.1, cloud=gce:
test artifacts and logs in: /home/agent/work/.go/src/github.com/cockroachdb/cockroach/artifacts/sqlsmith/setup=seed/setting=no-mutations/run_1
	sqlsmith.go:169,sqlsmith.go:199,test_runner.go:753: error: pq: internal error: decoding unset EncDatum
		stmt:
		SELECT
			NULL AS col_40022,
			((-4138610492061687842):::INT8::INT8 * tab_16520._interval::INTERVAL)::INTERVAL AS col_40023,
			tab_16520._jsonb AS col_40024
		FROM
			defaultdb.public.seed@seed__int8__float8__date_idx AS tab_16520
		LIMIT
			81:::INT8;

More

Artifacts: /sqlsmith/setup=seed/setting=no-mutations
Related:

• roachtest: sqlsmith/setup=seed/setting=no-mutations failed #47397 roachtest: sqlsmith/setup=seed/setting=no-mutations failed C-test-failure O-roachtest O-robot branch-master release-blocker

See this test on roachdash
_{powered by pkg/cmd/internal/issues}

[dt]

Did this get triaged?

[asubiotto]

It's unfortunate that this stayed under the radar because the build setup got cleaned up. I haven't been able to reproduce this and I don't think there's anything actionable here. cc @yuzefovich