chore: fix generate_series to_timestamp step unit bug (#13917)

* chore: fix generate_series to_timestamp step unit bug

* chore: fix generate_series to_timestamp step unit bug

* chore: fix generate_series to_timestamp step unit bug

src/query/service/src/table_functions/srf/range.rs

@@ -87,9 +87,22 @@ impl RangeTable {
 
         let start = table_args.positioned[0].clone();
         let end = table_args.positioned[1].clone();
-        let mut step = Scalar::Number(NumberScalar::Int64(1));
-        if table_args.positioned.len() == 3 {
-            step = table_args.positioned[2].clone();
+
+        let mut step = if table_args.positioned.len() == 3 {
+            table_args.positioned[2].clone()
+        } else {
+            Scalar::Number(NumberScalar::Int64(1))
+        };
+        if let Scalar::Timestamp(_) = start {
+            // since `to_timestamp` return value in micro seconds, we need to to change step as the same unit
+            let step_i64 = get_i64_number(&step)?;
+            if step_i64 < 1000 {
+                // treat step as seconds
+                step = Scalar::Number(NumberScalar::Int64(step_i64 * 1000000));
+            } else if step_i64 < 1000000 {
+                // treat step as mills seconds
+                step = Scalar::Number(NumberScalar::Int64(step_i64 * 1000));
+            }
         }
 
         let table_info = TableInfo {

tests/sqllogictests/suites/query/02_function/02_0063_function_generate_series.test

@@ -18,6 +18,17 @@ select * from generate_series('2021-03-26 00:00'::timestamp,'2021-03-27 12:00'::
 2021-03-26 00:00:00.000000
 2021-03-27 00:00:00.000000
 
+query T
+select * from generate_series('1970-01-01 00:00'::timestamp,to_timestamp(2),2000000);
+----
+1970-01-01 00:00:00.000000
+1970-01-01 00:00:02.000000
+
+query T
+select * from generate_series(to_timestamp(1),to_timestamp(2),2);
+----
+1970-01-01 00:00:01.000000
+
 query T
 select * from generate_series('2021-03-26'::date,'2021-03-27'::date,1);
 ----