Check for error and report the error on the result of quackScanState->preparedStatement->Execute()

[Tishj]

While working on the UnsupportedPostgresType I came across an infinite hang in the client, traced it down to not checking for an execution error, this fixed it

[mkaruza]

Is there reproduction steps which can be added for regression ?

[Tishj]

I'll add a test, likely creating a table with varchar and putting abc into it, then running select a::INTEGER from tbl already causes this

Having a bit of trouble with postgres right now, server is broken and doesn't want to shut down
After I get it resolved I'll create the test