This currently only returns type BOOL, S (String) and N (Number), extend to include more types.

[bgood]

This will currently only return data as type BOOL, S (String) and N (Number). Would it be an idea to:

1. Convert Cloud Spanner BYTES(..) columns to B (Binary)
2. Convert Cloud Spanner INT64 and NUMERIC columns to N (Numeric).
3. And later: Add support for ARRAY, ARRAY and ARRAY<INTEGER | FLOAT64 | NUMERIC> by mapping these to SS, BS and NS.

Originally posted by @olavloite in #3 (comment)