trino-go-client: Panic: runtime error: index out of range in driverRows.Next

I’m hitting a panic that I reproduce pretty well, but not always, it sometimes panics and sometimes doesn’t.

I’m using a pretty simple query: SELECT 1, NULL, 'abc'", but I’m not sure if it’s relevant.

The relevant part of the backtrace:

panic: runtime error: index out of range [1] with length 1

goroutine 125 [running]:
github.com/trinodb/trino-go-client/trino.(*driverRows).Next(0x14000708160, {0x140000aa3f0, 0x9, 0x10667fbb0?})
        /Users/thomas/go/pkg/mod/github.com/trinodb/trino-go-client@v0.308.0/trino/trino.go:1028 +0x2a0

After that it’s my code calling trino.driverRows.Next directly.

Code where the panic happens: https://github.com/trinodb/trino-go-client/blob/565ca64bac1a1fc78d2413736a4abf6d9d38e85c/trino/trino.go#L1028

This is the state of trino.driverRows:

// First call to trino.driverRows.Next (Ok):
&{
	ctx:0x14000117980 
	stmt:0x140001153e0 
	queryID:20230104_135631_01766_ysbyr 
	nextURI:https://localhost:8443/v1/statement/queued/20230104_135631_01766_ysbyr/y235c9529065f1ef1da71af639ccea62d7e95fe9e/1 
	err:<nil> 
	rowindex:0 
	columns:[_col0 _col1 _col2] 
	coltype:[0x140001a67e0 0x140001a68c0 0x140001a6930] 
	data:[[1 <nil> abc]] 
	rowsAffected:0 
	statsCh:<nil> 
	doneCh:0x1400056e360
}

// Second call (panics):
&{
	ctx:0x14000117980 
	stmt:0x140001153e0 
	queryID:20230104_135631_01766_ysbyr 
	nextURI:https://localhost:8443/v1/statement/queued/20230104_135631_01766_ysbyr/y235c9529065f1ef1da71af639ccea62d7e95fe9e/1 
	err:<nil> 
	rowindex:1 
	columns:[_col0 _col1 _col2] 
	coltype:[0x140001a67e0 0x140001a68c0 0x140001a6930] 
	data:[[1 <nil> abc]] 
	rowsAffected:0 
	statsCh:<nil> 
	doneCh:0x1400056e360
}

I think the following line is incorrect: https://github.com/trinodb/trino-go-client/blob/565ca64bac1a1fc78d2413736a4abf6d9d38e85c/trino/trino.go#L1010

I think >= should be changed to > since indexing is zero based. But what I can’t figure out why the current code works sometimes, but panics in the next test run… Incorrect.