fix(spanner): add missing NUMERIC type to the doc for Row
@@ -58,6 +58,8 @@ import (
// *[]bool, *[]NullBool - BOOL ARRAY
// *float64(not NULL), *NullFloat64 - FLOAT64
// *[]float64, *[]NullFloat64 - FLOAT64 ARRAY
+// *big.Rat(not NULL), *NullNumeric - NUMERIC
+// *[]big.Rat, *[]NullNumeric - NUMERIC ARRAY
// *time.Time(not NULL), *NullTime - TIMESTAMP
// *[]time.Time, *[]NullTime - TIMESTAMP ARRAY
// *Date(not NULL), *NullDate - DATE
