The snowflake virtual schema's capabilities, mapping and query pushdown are mainly based on the existing PostgreSql virtual schema. This is because the PostgreSql database approaches Snowflake the closest, functionality wise. Currently there are few deviations but this is expected to change.
The numeric datatype has a higher supported precision in Snowflake (38 vs 36 in Snowflake): If the precision is higher than 36 the column gets mapped to varchar and will display 'Precision not supported' as value.