scan

type Options struct {
	SampleRows     int  // rows per table
	MetaSampleRows int  // rows per key/value table too big to read whole
	KeySampleRows  int  // rows per key of a key/value table
	Samples        bool // false judges names only and reads no rows
	// SampleKeysOnly reads every key/value table by sampling, as for tables
	// too large to list their keys: a window of rows plus probes for the
	// keys presets know.
	SampleKeysOnly bool
	Preset         string
	MaxValueLen    int
	Version        string
	Progress       func(done, total int, table string)
}