sql/pgwire: panic when number of output columns changes between prepare and execute #16062
Description
https://sentry.io/cockroach-labs/cockroachdb/issues/278019124/
*errors.errorString: runtime.errorString v3.go:353
File "github.com/cockroachdb/cockroach/pkg/sql/pgwire/v3.go", line 353, in func1
File "github.com/cockroachdb/cockroach/pkg/sql/pgwire/v3.go", line 981, in sendResponse
File "github.com/cockroachdb/cockroach/pkg/sql/pgwire/v3.go", line 846, in executeStatements
File "github.com/cockroachdb/cockroach/pkg/sql/pgwire/v3.go", line 823, in handleExecute
File "github.com/cockroachdb/cockroach/pkg/sql/pgwire/v3.go", line 455, in serve
...
(6 additional frame(s) were not displayed)
runtime.errorString v3.go:353
The stack trace says the query has returned more result columns than the query preparation had decided there would be. Either a logic error somewhere or we've not been careful about schema changes happening between prepare and execute.
cc @jordanlewis
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