feat: enable empty range by (#2697)

Cargo.toml

@@ -109,7 +109,7 @@ serde_json = "1.0"
 smallvec = "1"
 snafu = { version = "0.7", features = ["backtraces"] }
 # on branch v0.38.x
-sqlparser = { git = "https://github.com/GreptimeTeam/sqlparser-rs.git", rev = "602d7878c9949e48512251c7f18695a50936e51c", features = [
+sqlparser = { git = "https://github.com/GreptimeTeam/sqlparser-rs.git", rev = "0fbae07d0c46dc18e3381c406d8b9b8abef6b1fd", features = [
     "visitor",
 ] }
 strum = { version = "0.25", features = ["derive"] }

tests/cases/standalone/common/range/by.result

@@ -39,6 +39,17 @@ SELECT ts, max(val) RANGE '5s' FROM host ALIGN '20s' BY (2) ORDER BY ts;
 | 1970-01-01T00:00:20 | 5                                |
 +---------------------+----------------------------------+
 
+-- The user explicitly specifies that the aggregation key is empty. In this case, there is no aggregation key. All data will be aggregated into a group.
+-- Implement by rewrite `BY()` to `BY(1)` automatically through sqlparser. They are semantically equivalent.
+SELECT ts, max(val) RANGE '5s' FROM host ALIGN '20s' BY () ORDER BY ts;
+
++---------------------+----------------------------------+
+| ts                  | MAX(host.val) RANGE 5s FILL NULL |
++---------------------+----------------------------------+
+| 1970-01-01T00:00:00 | 3                                |
+| 1970-01-01T00:00:20 | 5                                |
++---------------------+----------------------------------+
+
 SELECT ts, CAST(length(host) as INT64) + 2, max(val) RANGE '5s' FROM host ALIGN '20s' BY (CAST(length(host) as INT64) + 2) ORDER BY ts;
 
 +---------------------+----------------------------------------+----------------------------------+
@@ -48,6 +59,12 @@ SELECT ts, CAST(length(host) as INT64) + 2, max(val) RANGE '5s' FROM host ALIGN
 | 1970-01-01T00:00:20 | 7                                      | 5                                |
 +---------------------+----------------------------------------+----------------------------------+
 
+-- Test error
+-- project non-aggregation key
+SELECT ts, host, max(val) RANGE '5s' FROM host ALIGN '20s' BY () ORDER BY ts;
+
+Error: 3001(EngineExecuteQuery), No field named host.host. Valid fields are "MAX(host.val) RANGE 5s FILL NULL", host.ts, "Int64(1)".
+
 DROP TABLE host;
 
 Affected Rows: 0

tests/cases/standalone/common/range/by.sql

@@ -22,6 +22,15 @@ SELECT ts, length(host), max(val) RANGE '5s' FROM host ALIGN '20s' BY (length(ho
 
 SELECT ts, max(val) RANGE '5s' FROM host ALIGN '20s' BY (2) ORDER BY ts;
 
+-- The user explicitly specifies that the aggregation key is empty. In this case, there is no aggregation key. All data will be aggregated into a group.
+-- Implement by rewrite `BY()` to `BY(1)` automatically through sqlparser. They are semantically equivalent.
+SELECT ts, max(val) RANGE '5s' FROM host ALIGN '20s' BY () ORDER BY ts;
+
 SELECT ts, CAST(length(host) as INT64) + 2, max(val) RANGE '5s' FROM host ALIGN '20s' BY (CAST(length(host) as INT64) + 2) ORDER BY ts;
 
+-- Test error
+
+-- project non-aggregation key
+SELECT ts, host, max(val) RANGE '5s' FROM host ALIGN '20s' BY () ORDER BY ts;
+
 DROP TABLE host;