CREATE TABLE host (
  ts timestamp(3) time index,
  host STRING PRIMARY KEY,
  val BIGINT,
);

Affected Rows: 0

INSERT INTO TABLE host VALUES
    ("1970-01-01T23:30:00+00:00", 'host1', 0),
    ("1970-01-01T22:30:00+00:00", 'host1', 1),
    ("1970-01-02T23:30:00+00:00", 'host1', 2),
    ("1970-01-02T22:30:00+00:00", 'host1', 3),
    ("1970-01-01T23:30:00+00:00", 'host2', 4),
    ("1970-01-01T22:30:00+00:00", 'host2', 5),
    ("1970-01-02T23:30:00+00:00", 'host2', 6),
    ("1970-01-02T22:30:00+00:00", 'host2', 7);

Affected Rows: 8

SELECT ts, host, min(val) RANGE '1d' FROM host ALIGN '1d' ORDER BY host, ts;

+---------------------+-------+----------------------------------+
| ts                  | host  | MIN(host.val) RANGE 1d FILL NULL |
+---------------------+-------+----------------------------------+
| 1970-01-02T00:00:00 | host1 | 0                                |
| 1970-01-03T00:00:00 | host1 | 2                                |
| 1970-01-02T00:00:00 | host2 | 4                                |
| 1970-01-03T00:00:00 | host2 | 6                                |
+---------------------+-------+----------------------------------+

SELECT ts, host, min(val) RANGE '1d' FROM host ALIGN '1d' TO CALENDAR ORDER BY host, ts;

+---------------------+-------+----------------------------------+
| ts                  | host  | MIN(host.val) RANGE 1d FILL NULL |
+---------------------+-------+----------------------------------+
| 1970-01-02T00:00:00 | host1 | 0                                |
| 1970-01-03T00:00:00 | host1 | 2                                |
| 1970-01-02T00:00:00 | host2 | 4                                |
| 1970-01-03T00:00:00 | host2 | 6                                |
+---------------------+-------+----------------------------------+

SELECT ts, host, min(val) RANGE '1d' FROM host ALIGN '1d' TO UNKNOWN ORDER BY host, ts;

Error: 3000(PlanQuery), DataFusion error: Error during planning: Illegal `align to` argument `UNKNOWN` in range select query, can't be parse as NOW/CALENDAR/Timestamp, error: Failed to parse a string into Timestamp, raw string: UNKNOWN

SELECT ts, host, min(val) RANGE '1d' FROM host ALIGN '1d' TO '1900-01-01T00:00:00+01:00' ORDER BY host, ts;

+---------------------+-------+----------------------------------+
| ts                  | host  | MIN(host.val) RANGE 1d FILL NULL |
+---------------------+-------+----------------------------------+
| 1970-01-01T23:00:00 | host1 | 1                                |
| 1970-01-02T23:00:00 | host1 | 0                                |
| 1970-01-03T23:00:00 | host1 | 2                                |
| 1970-01-01T23:00:00 | host2 | 5                                |
| 1970-01-02T23:00:00 | host2 | 4                                |
| 1970-01-03T23:00:00 | host2 | 6                                |
+---------------------+-------+----------------------------------+

SELECT ts, host, min(val) RANGE '1d' FROM host ALIGN '1d' TO '1970-01-01T00:00:00+01:00' ORDER BY host, ts;

+---------------------+-------+----------------------------------+
| ts                  | host  | MIN(host.val) RANGE 1d FILL NULL |
+---------------------+-------+----------------------------------+
| 1970-01-01T23:00:00 | host1 | 1                                |
| 1970-01-02T23:00:00 | host1 | 0                                |
| 1970-01-03T23:00:00 | host1 | 2                                |
| 1970-01-01T23:00:00 | host2 | 5                                |
| 1970-01-02T23:00:00 | host2 | 4                                |
| 1970-01-03T23:00:00 | host2 | 6                                |
+---------------------+-------+----------------------------------+

SELECT ts, host, min(val) RANGE '1d' FROM host ALIGN '1d' TO '2023-01-01T00:00:00+01:00' ORDER BY host, ts;

+---------------------+-------+----------------------------------+
| ts                  | host  | MIN(host.val) RANGE 1d FILL NULL |
+---------------------+-------+----------------------------------+
| 1970-01-01T23:00:00 | host1 | 1                                |
| 1970-01-02T23:00:00 | host1 | 0                                |
| 1970-01-03T23:00:00 | host1 | 2                                |
| 1970-01-01T23:00:00 | host2 | 5                                |
| 1970-01-02T23:00:00 | host2 | 4                                |
| 1970-01-03T23:00:00 | host2 | 6                                |
+---------------------+-------+----------------------------------+

SELECT ts, min(val) RANGE (INTERVAL '1' day) FROM host ALIGN (INTERVAL '1' day) TO '1900-01-01T00:00:00+01:00' by (1) ORDER BY ts;

+---------------------+----------------------------------------------------------------------------+
| ts                  | MIN(host.val) RANGE IntervalMonthDayNano("18446744073709551616") FILL NULL |
+---------------------+----------------------------------------------------------------------------+
| 1970-01-01T23:00:00 | 1                                                                          |
| 1970-01-02T23:00:00 | 0                                                                          |
| 1970-01-03T23:00:00 | 2                                                                          |
+---------------------+----------------------------------------------------------------------------+

DROP TABLE host;

Affected Rows: 0