Database/SQL API missing Precision for type DateTime64

[tientt-holistics]

Observed

According to Clickhouse documentation, type Datetime64 has a tick size precision DateTime64(precision, [timezone]).
However, the returned type does not have precision.

Expected behaviour

DateTime64 type should have precision.

Code example

conn := clickhouse.OpenDB(&clickhouse.Options{
  Addr: []string{"127.0.0.1:9000"},
  Auth: clickhouse.Auth{
	  Database: "",
	  Username: "",
	  Password: "",
  },
})
rows, err := conn.Query(`SELECT toDateTime64(1546300800.123, 3)`)
columnTypes, _ := rows.ColumnTypes()

for _, columnType := range columnTypes {
   precision, scale, ok := columnType.DecimalSize();
   fmt.Printf("%d %d %t",precision, scale, ok) // returns 0, 0, false
}

Details

Environment

• clickhouse-go version: v2.30.0
• Interface: ClickHouse API / database/sql compatible driver
• Go version: 1.23.4
• Operating system: Ubuntu 22.04.5 LTS
• ClickHouse version: 24.1.5.6
• Is it a ClickHouse Cloud?: No
• ClickHouse Server non-default settings, if any:
• CREATE TABLE statements for tables involved:
• Sample data for all these tables, use clickhouse-obfuscator if necessary