feat: add 'date.now' function for current timestamp support

prqlc/bindings/prqlc-python/src/lib.rs

@@ -232,15 +232,15 @@ mod test {
     fn debug_prql_lineage() {
         assert_snapshot!(
             debug::prql_lineage(r#"from a | select { beta, gamma }"#).unwrap(),
-            @r#"{"frames":[["1:9-31",{"columns":[{"Single":{"name":["a","beta"],"target_id":119,"target_name":null}},{"Single":{"name":["a","gamma"],"target_id":120,"target_name":null}}],"inputs":[{"id":117,"name":"a","table":["default_db","a"]}]}]],"nodes":[{"id":117,"kind":"Ident","span":"1:0-6","ident":{"Ident":["default_db","a"]},"parent":122},{"id":119,"kind":"Ident","span":"1:18-22","ident":{"Ident":["this","a","beta"]},"targets":[117],"parent":121},{"id":120,"kind":"Ident","span":"1:24-29","ident":{"Ident":["this","a","gamma"]},"targets":[117],"parent":121},{"id":121,"kind":"Tuple","span":"1:16-31","children":[119,120],"parent":122},{"id":122,"kind":"TransformCall: Select","span":"1:9-31","children":[117,121]}],"ast":{"name":"Project","stmts":[{"VarDef":{"kind":"Main","name":"main","value":{"Pipeline":{"exprs":[{"FuncCall":{"name":{"Ident":["from"],"span":"1:0-4"},"args":[{"Ident":["a"],"span":"1:5-6"}]},"span":"1:0-6"},{"FuncCall":{"name":{"Ident":["select"],"span":"1:9-15"},"args":[{"Tuple":[{"Ident":["beta"],"span":"1:18-22"},{"Ident":["gamma"],"span":"1:24-29"}],"span":"1:16-31"}]},"span":"1:9-31"}]},"span":"1:0-31"}},"span":"1:0-31"}]}}"#
+            @r#"{"frames":[["1:9-31",{"columns":[{"Single":{"name":["a","beta"],"target_id":120,"target_name":null}},{"Single":{"name":["a","gamma"],"target_id":121,"target_name":null}}],"inputs":[{"id":118,"name":"a","table":["default_db","a"]}]}]],"nodes":[{"id":118,"kind":"Ident","span":"1:0-6","ident":{"Ident":["default_db","a"]},"parent":123},{"id":120,"kind":"Ident","span":"1:18-22","ident":{"Ident":["this","a","beta"]},"targets":[118],"parent":122},{"id":121,"kind":"Ident","span":"1:24-29","ident":{"Ident":["this","a","gamma"]},"targets":[118],"parent":122},{"id":122,"kind":"Tuple","span":"1:16-31","children":[120,121],"parent":123},{"id":123,"kind":"TransformCall: Select","span":"1:9-31","children":[118,122]}],"ast":{"name":"Project","stmts":[{"VarDef":{"kind":"Main","name":"main","value":{"Pipeline":{"exprs":[{"FuncCall":{"name":{"Ident":["from"],"span":"1:0-4"},"args":[{"Ident":["a"],"span":"1:5-6"}]},"span":"1:0-6"},{"FuncCall":{"name":{"Ident":["select"],"span":"1:9-15"},"args":[{"Tuple":[{"Ident":["beta"],"span":"1:18-22"},{"Ident":["gamma"],"span":"1:24-29"}],"span":"1:16-31"}]},"span":"1:9-31"}]},"span":"1:0-31"}},"span":"1:0-31"}]}}"#
         );
     }
 
     #[test]
     fn debug_pl_to_lineage() {
         assert_snapshot!(
             prql_to_pl(r#"from a | select { beta, gamma }"#).and_then(|x| debug::pl_to_lineage(&x)).unwrap(),
-            @r#"{"frames":[["1:9-31",{"columns":[{"Single":{"name":["a","beta"],"target_id":119,"target_name":null}},{"Single":{"name":["a","gamma"],"target_id":120,"target_name":null}}],"inputs":[{"id":117,"name":"a","table":["default_db","a"]}]}]],"nodes":[{"id":117,"kind":"Ident","span":"1:0-6","ident":{"Ident":["default_db","a"]},"parent":122},{"id":119,"kind":"Ident","span":"1:18-22","ident":{"Ident":["this","a","beta"]},"targets":[117],"parent":121},{"id":120,"kind":"Ident","span":"1:24-29","ident":{"Ident":["this","a","gamma"]},"targets":[117],"parent":121},{"id":121,"kind":"Tuple","span":"1:16-31","children":[119,120],"parent":122},{"id":122,"kind":"TransformCall: Select","span":"1:9-31","children":[117,121]}],"ast":{"name":"Project","stmts":[{"VarDef":{"kind":"Main","name":"main","value":{"Pipeline":{"exprs":[{"FuncCall":{"name":{"Ident":["from"],"span":"1:0-4"},"args":[{"Ident":["a"],"span":"1:5-6"}]},"span":"1:0-6"},{"FuncCall":{"name":{"Ident":["select"],"span":"1:9-15"},"args":[{"Tuple":[{"Ident":["beta"],"span":"1:18-22"},{"Ident":["gamma"],"span":"1:24-29"}],"span":"1:16-31"}]},"span":"1:9-31"}]},"span":"1:0-31"}},"span":"1:0-31"}]}}"#
+            @r#"{"frames":[["1:9-31",{"columns":[{"Single":{"name":["a","beta"],"target_id":120,"target_name":null}},{"Single":{"name":["a","gamma"],"target_id":121,"target_name":null}}],"inputs":[{"id":118,"name":"a","table":["default_db","a"]}]}]],"nodes":[{"id":118,"kind":"Ident","span":"1:0-6","ident":{"Ident":["default_db","a"]},"parent":123},{"id":120,"kind":"Ident","span":"1:18-22","ident":{"Ident":["this","a","beta"]},"targets":[118],"parent":122},{"id":121,"kind":"Ident","span":"1:24-29","ident":{"Ident":["this","a","gamma"]},"targets":[118],"parent":122},{"id":122,"kind":"Tuple","span":"1:16-31","children":[120,121],"parent":123},{"id":123,"kind":"TransformCall: Select","span":"1:9-31","children":[118,122]}],"ast":{"name":"Project","stmts":[{"VarDef":{"kind":"Main","name":"main","value":{"Pipeline":{"exprs":[{"FuncCall":{"name":{"Ident":["from"],"span":"1:0-4"},"args":[{"Ident":["a"],"span":"1:5-6"}]},"span":"1:0-6"},{"FuncCall":{"name":{"Ident":["select"],"span":"1:9-15"},"args":[{"Tuple":[{"Ident":["beta"],"span":"1:18-22"},{"Ident":["gamma"],"span":"1:24-29"}],"span":"1:16-31"}]},"span":"1:9-31"}]},"span":"1:0-31"}},"span":"1:0-31"}]}}"#
         );
     }
 }

prqlc/prqlc/src/cli/test.rs

@@ -434,61 +434,61 @@ fn debug() {
           name:
           - tracks
           - artist
-          target_id: 119
+          target_id: 120
           target_name: null
         - !Single
           name:
           - tracks
           - album
-          target_id: 120
+          target_id: 121
           target_name: null
         inputs:
-        - id: 117
+        - id: 118
           name: tracks
           table:
           - default_db
           - tracks
     nodes:
-    - id: 117
+    - id: 118
       kind: Ident
       span: 1:0-11
       ident: !Ident
       - default_db
       - tracks
-      parent: 122
-    - id: 119
+      parent: 123
+    - id: 120
       kind: Ident
       span: 1:22-28
       ident: !Ident
       - this
       - tracks
       - artist
       targets:
-      - 117
-      parent: 121
-    - id: 120
+      - 118
+      parent: 122
+    - id: 121
       kind: Ident
       span: 1:30-35
       ident: !Ident
       - this
       - tracks
       - album
       targets:
-      - 117
-      parent: 121
-    - id: 121
+      - 118
+      parent: 122
+    - id: 122
       kind: Tuple
       span: 1:21-36
       children:
-      - 119
       - 120
-      parent: 122
-    - id: 122
+      - 121
+      parent: 123
+    - id: 123
       kind: 'TransformCall: Select'
       span: 1:14-36
       children:
-      - 117
-      - 121
+      - 118
+      - 122
     ast:
       name: Project
       stmts:

prqlc/prqlc/src/semantic/resolver/snapshots/prqlc__semantic__resolver__test__append_union_different_tables.snap

@@ -7,21 +7,21 @@ columns:
       name:
         - employees
         - name
-      target_id: 133
+      target_id: 134
       target_name: ~
   - Single:
       name:
         - employees
         - salary
-      target_id: 134
+      target_id: 135
       target_name: ~
 inputs:
-  - id: 131
+  - id: 132
     name: employees
     table:
       - default_db
       - employees
-  - id: 120
+  - id: 121
     name: managers
     table:
       - default_db

prqlc/prqlc/src/semantic/resolver/snapshots/prqlc__semantic__resolver__test__frames_and_names-2.snap

@@ -4,18 +4,18 @@ expression: "resolve_lineage(r#\"\n            from table_1\n            join cu
 ---
 columns:
   - All:
-      input_id: 118
+      input_id: 119
       except: []
   - All:
-      input_id: 115
+      input_id: 116
       except: []
 inputs:
-  - id: 118
+  - id: 119
     name: table_1
     table:
       - default_db
       - table_1
-  - id: 115
+  - id: 116
     name: customers
     table:
       - default_db

prqlc/prqlc/src/semantic/resolver/snapshots/prqlc__semantic__resolver__test__frames_and_names-3.snap

@@ -7,26 +7,26 @@ columns:
       name:
         - e
         - emp_no
-      target_id: 128
+      target_id: 129
       target_name: ~
   - Single:
       name:
         - e
         - gender
-      target_id: 129
+      target_id: 130
       target_name: ~
   - Single:
       name:
         - emp_salary
-      target_id: 147
+      target_id: 148
       target_name: ~
 inputs:
-  - id: 121
+  - id: 122
     name: e
     table:
       - default_db
       - employees
-  - id: 118
+  - id: 119
     name: salaries
     table:
       - default_db

prqlc/prqlc/src/semantic/resolver/snapshots/prqlc__semantic__resolver__test__frames_and_names.snap

@@ -7,26 +7,26 @@ columns:
       name:
         - orders
         - customer_no
-      target_id: 122
+      target_id: 123
       target_name: ~
   - Single:
       name:
         - orders
         - gross
-      target_id: 123
+      target_id: 124
       target_name: ~
   - Single:
       name:
         - orders
         - tax
-      target_id: 124
+      target_id: 125
       target_name: ~
   - Single:
       name: ~
-      target_id: 125
+      target_id: 126
       target_name: ~
 inputs:
-  - id: 120
+  - id: 121
     name: orders
     table:
       - default_db

prqlc/prqlc/src/semantic/resolver/snapshots/prqlc__semantic__resolver__transforms__tests__aggregate_positional_arg-2.snap

@@ -21,10 +21,10 @@ TransformCall:
     lineage:
       columns:
         - All:
-            input_id: 117
+            input_id: 118
             except: []
       inputs:
-        - id: 117
+        - id: 118
           name: c_invoice
           table:
             - default_db
@@ -94,14 +94,14 @@ lineage:
         name:
           - c_invoice
           - issued_at
-        target_id: 119
+        target_id: 120
         target_name: ~
     - Single:
         name: ~
-        target_id: 135
+        target_id: 136
         target_name: ~
   inputs:
-    - id: 117
+    - id: 118
       name: c_invoice
       table:
         - default_db

prqlc/prqlc/src/semantic/std.prql

@@ -224,7 +224,10 @@ module text {
 }
 
 ## Date functions
+
 module date {
+  # Returns the current date and time as a timestamp.
+  let now = -> <timestamp> internal std.date.now
   let to_text = format<text> column -> <text> internal std.date.to_text
   let diff = `noresolve.unit` start end -> <int> internal std.date.diff
 }

prqlc/prqlc/src/sql/std.sql.prql

@@ -130,6 +130,9 @@ module date {
   # Snowflake: https://docs.snowflake.com/en/sql-reference/functions/datediff
   # Redshift: https://docs.aws.amazon.com/redshift/latest/dg/r_DATEDIFF_function.html
   let diff = unit start end -> s"DATEDIFF({unit:0}, {start:0}, {end:0})"
+
+  # CURRENT_TIMESTAMP is ANSI SQL standard; dialects may override.
+  let now = -> s"CURRENT_TIMESTAMP"
 }
 
 # Source-reading functions, primarily for DuckDB
@@ -215,6 +218,8 @@ module bigquery {
     let to_text = format column -> s"FORMAT_TIMESTAMP({format:0}, CAST({column:0} AS TIMESTAMP))"
     # https://cloud.google.com/bigquery/docs/reference/standard-sql/date_functions#date_diff
     let diff = unit start end -> s"DATE_DIFF({end:0}, {start:0}, {unit:0})"
+    # BigQuery requires parentheses for CURRENT_TIMESTAMP
+    let now = -> s"CURRENT_TIMESTAMP()"
   }
 
   let regex_search = text pattern -> s"REGEXP_CONTAINS({text:0}, {pattern:0})"
@@ -234,6 +239,8 @@ module clickhouse {
     let to_text = format column -> s"formatDateTimeInJodaSyntax({column:0}, {format:0})"
     # https://clickhouse.com/docs/en/sql-reference/functions/date-time-functions#dateDiff
     let diff = unit start end -> s"dateDiff('{unit:0}', {start:0}, {end:0})"
+    # Clickhouse uses now() for current timestamp
+    let now = -> s"now()"
   }
 
   let regex_search = text pattern -> s"match({text:0}, {pattern:0})"
@@ -314,6 +321,8 @@ module mysql {
     let to_text = format column -> s"DATE_FORMAT({column:0}, {format:0})"
     # https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html#function_timestampdiff
     let diff = unit start end -> s"TIMESTAMPDIFF({unit:0}, {start:0}, {end:0})"
+    # MySQL uses NOW() function
+    let now = -> s"NOW()"
   }
 
   # 'c' for case-sensitive