re_format: barebone support for custom formatting

crates/re_arrow_store/src/arrow_util.rs

@@ -51,7 +51,14 @@ impl ArrayExt for dyn Array {
     ///
     /// Nested types are expanded and cleaned recursively
     fn clean_for_polars(&self) -> Box<dyn Array> {
-        match self.data_type() {
+        let datatype = self.data_type();
+        let datatype = if let DataType::Extension(_, inner, _) = datatype {
+            (**inner).clone()
+        } else {
+            datatype.clone()
+        };
+
+        match &datatype {
             DataType::List(field) => {
                 // Recursively clean the contents
                 let typed_arr = self.as_any().downcast_ref::<ListArray<i32>>().unwrap();

crates/re_format/Cargo.toml

@@ -15,7 +15,9 @@ version.workspace = true
 [package.metadata.docs.rs]
 all-features = true
 
-
 [dependencies]
 arrow2.workspace = true
+arrow2_convert.workspace = true
 comfy-table.workspace = true
+parking_lot.workspace = true
+re_tuid.workspace = true

crates/re_format/src/arrow.rs

@@ -3,22 +3,91 @@
 use std::fmt::Formatter;
 
 use arrow2::{
-    array::{get_display, Array},
+    array::{get_display, Array, ListArray, StructArray},
     datatypes::{DataType, IntervalUnit, TimeUnit},
 };
+use arrow2_convert::deserialize::TryIntoCollection;
 use comfy_table::{presets, Cell, Table};
 
+use re_tuid::Tuid;
+
+// ---
+
+// TODO(#1775): Registering custom formatters should be done from other crates:
+// A) Because `re_format` cannot depend on other crates (cyclic deps)
+// B) Because how to deserialize and inspect some type is a private implementation detail of that
+//    type, re_format shouldn't know how to deserialize a TUID...
+
+type CustomFormatter<'a, F> = Box<dyn Fn(&mut F, usize) -> std::fmt::Result + 'a>;
+
+pub fn get_custom_display<'a, F: std::fmt::Write + 'a>(
+    _column_name: &'a str,
+    array: &'a dyn Array,
+    null: &'static str,
+) -> CustomFormatter<'a, F> {
+    // NOTE: If the top-level array is a list, it's probably not the type we're looking for: we're
+    // interested in the type of the array that's underneath.
+    let datatype = (|| match array.data_type().to_logical_type() {
+        DataType::List(_) => array
+            .as_any()
+            .downcast_ref::<ListArray<i32>>()?
+            .iter()
+            .next()?
+            .map(|array| array.data_type().clone()),
+        _ => Some(array.data_type().clone()),
+    })();
+
+    if let Some(DataType::Extension(name, _, _)) = datatype {
+        match name.as_str() {
+            // TODO(#1775): This should be registered dynamically.
+            // NOTE: Can't call `Tuid::name()`, `Component` lives in `re_log_types`.
+            "rerun.tuid" => Box::new(|w, index| {
+                if let Some(tuid) = parse_tuid(array, index) {
+                    w.write_fmt(format_args!("{tuid}"))
+                } else {
+                    w.write_str("<ERR>")
+                }
+            }),
+            _ => get_display(array, null),
+        }
+    } else {
+        get_display(array, null)
+    }
+}
+
+// TODO(#1775): This should be defined and registered by the `re_tuid` crate.
+fn parse_tuid(array: &dyn Array, index: usize) -> Option<Tuid> {
+    let (array, index) = match array.data_type().to_logical_type() {
+        // Legacy MsgId lists: just grab the first value, they're all identical
+        DataType::List(_) => (
+            array
+                .as_any()
+                .downcast_ref::<ListArray<i32>>()?
+                .value(index),
+            0,
+        ),
+        // New control columns: it's not a list to begin with!
+        _ => (array.to_boxed(), index),
+    };
+    let array = array.as_any().downcast_ref::<StructArray>()?;
+
+    let tuids: Vec<Tuid> = TryIntoCollection::try_into_collection(array.to_boxed()).ok()?;
+    tuids.get(index).copied()
+}
+
+// ---
+
 //TODO(john) move this and the Display impl upstream into arrow2
 #[repr(transparent)]
 pub struct DisplayTimeUnit(TimeUnit);
 
 impl std::fmt::Display for DisplayTimeUnit {
     fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
         let s = match self.0 {
-            arrow2::datatypes::TimeUnit::Second => "s",
-            arrow2::datatypes::TimeUnit::Millisecond => "ms",
-            arrow2::datatypes::TimeUnit::Microsecond => "us",
-            arrow2::datatypes::TimeUnit::Nanosecond => "ns",
+            TimeUnit::Second => "s",
+            TimeUnit::Millisecond => "ms",
+            TimeUnit::Microsecond => "us",
+            TimeUnit::Nanosecond => "ns",
         };
         f.write_str(s)
     }
@@ -133,24 +202,32 @@ where
     let mut table = Table::new();
     table.load_preset(presets::UTF8_FULL);
 
+    let names = names
+        .into_iter()
+        .map(|name| name.as_ref().to_owned())
+        .collect::<Vec<_>>();
     let arrays = columns.into_iter().collect::<Vec<_>>();
 
     let (displayers, lengths): (Vec<_>, Vec<_>) = arrays
         .iter()
-        .map(|array| (get_display(array.as_ref(), "-"), array.as_ref().len()))
+        .zip(names.iter())
+        .map(|(array, name)| {
+            let formatter = get_custom_display(name, array.as_ref(), "-");
+            (formatter, array.as_ref().len())
+        })
         .unzip();
 
     if displayers.is_empty() {
         return table;
     }
 
     let header = names
-        .into_iter()
+        .iter()
         .zip(arrays.iter().map(|array| array.as_ref().data_type()))
         .map(|(name, data_type)| {
             Cell::new(format!(
                 "{}\n---\n{}",
-                name.as_ref(),
+                name,
                 DisplayDataType(data_type.clone())
             ))
         });

crates/re_log_types/src/component_types/msg_id.rs

@@ -12,10 +12,10 @@ use crate::{Component, ComponentName};
 /// # use arrow2::datatypes::{DataType, Field};
 /// assert_eq!(
 ///     MsgId::data_type(),
-///     DataType::Struct(vec![
+///     DataType::Extension("rerun.tuid".into(), Box::new(DataType::Struct(vec![
 ///         Field::new("time_ns", DataType::UInt64, false),
 ///         Field::new("inc", DataType::UInt64, false),
-///     ])
+///     ])), None),
 /// );
 /// ```
 #[derive(

crates/re_log_types/src/data_table.rs

@@ -150,15 +150,15 @@ impl std::ops::IndexMut<usize> for DataCellColumn {
 ///
 /// The table above translates to the following, where each column is contiguous in memory:
 /// ```text
-/// ┌───────────────────────┬───────────────────────────────────┬────────────────────┬─────────────────────┬─────────────┬──────────────────────────────────┬─────────────────┐
-/// │ rerun.row_id          ┆ rerun.timepoint                   ┆ rerun.entity_path  ┆ rerun.num_instances ┆ rerun.label ┆ rerun.point2d                    ┆ rerun.colorrgba │
-/// ╞═══════════════════════╪═══════════════════════════════════╪════════════════════╪═════════════════════╪═════════════╪══════════════════════════════════╪═════════════════╡
-/// │ {167967218, 54449486} ┆ [{frame_nr, 1, 1}, {clock, 1, 1}] ┆ a                  ┆ 2                   ┆ []          ┆ [{x: 10, y: 10}, {x: 20, y: 20}] ┆ [2155905279]    │
-/// ├╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┤
-/// │ {167967218, 54449486} ┆ [{frame_nr, 1, 1}, {clock, 1, 2}] ┆ b                  ┆ 0                   ┆ -           ┆ -                                ┆ []              │
-/// ├╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┤
-/// │ {167967218, 54449486} ┆ [{frame_nr, 1, 2}, {clock, 1, 1}] ┆ c                  ┆ 1                   ┆ [hey]       ┆ -                                ┆ [4294967295]    │
-/// └───────────────────────┴───────────────────────────────────┴────────────────────┴─────────────────────┴─────────────┴──────────────────────────────────┴─────────────────┘
+/// ┌──────────┬───────────────────────────────┬──────────────────────────────────┬───────────────────┬─────────────────────┬─────────────┬──────────────────────────────────┬─────────────────┐
+/// │ frame_nr ┆ log_time                      ┆ rerun.row_id                     ┆ rerun.entity_path ┆ rerun.num_instances ┆ rerun.label ┆ rerun.point2d                    ┆ rerun.colorrgba │
+/// ╞══════════╪═══════════════════════════════╪══════════════════════════════════╪═══════════════════╪═════════════════════╪═════════════╪══════════════════════════════════╪═════════════════╡
+/// │ 1        ┆ 2023-04-05 09:36:47.188796402 ┆ 1753004ACBF5D6E651F2983C3DAF260C ┆ a                 ┆ 2                   ┆ []          ┆ [{x: 10, y: 10}, {x: 20, y: 20}] ┆ [2155905279]    │
+/// ├╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┤
+/// │ 1        ┆ 2023-04-05 09:36:47.188852222 ┆ 1753004ACBF5D6E651F2983C3DAF260C ┆ b                 ┆ 0                   ┆ -           ┆ -                                ┆ []              │
+/// ├╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┤
+/// │ 2        ┆ 2023-04-05 09:36:47.188855872 ┆ 1753004ACBF5D6E651F2983C3DAF260C ┆ c                 ┆ 1                   ┆ [hey]       ┆ -                                ┆ [4294967295]    │
+/// └──────────┴───────────────────────────────┴──────────────────────────────────┴───────────────────┴─────────────────────┴─────────────┴──────────────────────────────────┴─────────────────┘
 /// ```
 ///
 /// ## Example
@@ -533,8 +533,6 @@ impl DataTable {
                 [(METADATA_KIND.to_owned(), METADATA_KIND_CONTROL.to_owned())].into(),
             );
 
-            // TODO(cmc): why do we have to do this manually on the way out, but it's done
-            // automatically on our behalf on the way in...?
             if let DataType::Extension(name, _, _) = data.data_type() {
                 field
                     .metadata
@@ -627,15 +625,20 @@ impl DataTable {
                 .map(|cell| cell.as_arrow_ref())
                 .collect_vec();
 
+            let ext_name = cell_refs.first().and_then(|cell| match cell.data_type() {
+                DataType::Extension(name, _, _) => Some(name),
+                _ => None,
+            });
+
             // NOTE: Avoid paying for the cost of the concatenation machinery if there's a single
             // row in the column.
             let data = if cell_refs.len() == 1 {
-                data_to_lists(column, cell_refs[0].to_boxed())
+                data_to_lists(column, cell_refs[0].to_boxed(), ext_name.cloned())
             } else {
                 // NOTE: This is a column of cells, it shouldn't ever fail to concatenate since
                 // they share the same underlying type.
                 let data = arrow2::compute::concatenate::concatenate(cell_refs.as_slice())?;
-                data_to_lists(column, data)
+                data_to_lists(column, data, ext_name.cloned())
             };
 
             let field = Field::new(name, data.data_type().clone(), false)
@@ -648,10 +651,26 @@ impl DataTable {
         ///
         /// * Before: `[C, C, C, C, C, C, C, ...]`
         /// * After: `ListArray[ [[C, C], [C, C, C], None, [C], [C], ...] ]`
-        fn data_to_lists(column: &[Option<DataCell>], data: Box<dyn Array>) -> Box<dyn Array> {
+        fn data_to_lists(
+            column: &[Option<DataCell>],
+            data: Box<dyn Array>,
+            ext_name: Option<String>,
+        ) -> Box<dyn Array> {
             let datatype = data.data_type().clone();
 
-            let datatype = ListArray::<i32>::default_datatype(datatype);
+            let field = {
+                let mut field = Field::new("item", datatype, true);
+
+                if let Some(name) = ext_name {
+                    field
+                        .metadata
+                        .extend([("ARROW:extension:name".to_owned(), name)]);
+                }
+
+                field
+            };
+
+            let datatype = DataType::List(Box::new(field));
             let offsets = Offsets::try_from_lengths(column.iter().map(|cell| {
                 cell.as_ref()
                     .map_or(0, |cell| cell.num_instances() as usize)

crates/re_tuid/src/lib.rs

@@ -6,11 +6,10 @@
 #![doc = document_features::document_features!()]
 //!
 
-use arrow2_convert::{ArrowDeserialize, ArrowField, ArrowSerialize};
+use arrow2::datatypes::DataType;
+use arrow2_convert::{ArrowDeserialize, ArrowSerialize};
 
-#[derive(
-    Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, ArrowField, ArrowSerialize, ArrowDeserialize,
-)]
+#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, ArrowSerialize, ArrowDeserialize)]
 #[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
 pub struct Tuid {
     /// Approximate nanoseconds since epoch.
@@ -21,6 +20,27 @@ pub struct Tuid {
     inc: u64,
 }
 
+arrow2_convert::arrow_enable_vec_for_type!(Tuid);
+
+// TODO(#1774): shouldn't have to write this manually
+impl arrow2_convert::field::ArrowField for Tuid {
+    type Type = Self;
+
+    fn data_type() -> arrow2::datatypes::DataType {
+        let datatype = arrow2::datatypes::DataType::Struct(<[_]>::into_vec(Box::new([
+            <u64 as arrow2_convert::field::ArrowField>::field("time_ns"),
+            <u64 as arrow2_convert::field::ArrowField>::field("inc"),
+        ])));
+        DataType::Extension("rerun.tuid".into(), Box::new(datatype), None)
+    }
+}
+
+impl std::fmt::Display for Tuid {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{:032X}", self.as_u128())
+    }
+}
+
 impl std::fmt::Debug for Tuid {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         write!(f, "{:032X}", self.as_u128())