ArrayData use SharedVec to hold children

encodings/datetime-parts/src/array.rs

@@ -61,7 +61,7 @@ impl DateTimePartsArray {
                 seconds_dtype: seconds.dtype().clone(),
                 subseconds_dtype: subsecond.dtype().clone(),
             },
-            [days, seconds, subsecond].into(),
+            vec![days, seconds, subsecond].into(),
             StatsSet::new(),
         )
     }

encodings/dict/src/dict.rs

@@ -36,7 +36,7 @@ impl DictArray {
                 codes_dtype: codes.dtype().clone(),
                 values_len: values.len(),
             },
-            [values, codes].into(),
+            vec![values, codes].into(),
             StatsSet::new(),
         )
     }

encodings/fastlanes/src/for/mod.rs

@@ -37,7 +37,7 @@ impl FoRArray {
             reference.dtype().clone(),
             child.len(),
             FoRMetadata { reference, shift },
-            [child].into(),
+            vec![child].into(),
             StatsSet::new(),
         )
     }

encodings/fsst/src/array.rs

@@ -1,5 +1,3 @@
-use std::sync::Arc;
-
 use fsst::{Decompressor, Symbol};
 use serde::{Deserialize, Serialize};
 use vortex::array::VarBinArray;
@@ -75,7 +73,7 @@ impl FSSTArray {
         let len = codes.len();
         let strings_dtype = codes.dtype().clone();
         let uncompressed_lengths_dtype = uncompressed_lengths.dtype().clone();
-        let children = Arc::new([symbols, symbol_lengths, codes, uncompressed_lengths]);
+        let children = vec![symbols, symbol_lengths, codes, uncompressed_lengths];
 
         Self::try_from_parts(
             dtype,
@@ -85,7 +83,7 @@ impl FSSTArray {
                 codes_dtype: strings_dtype,
                 uncompressed_lengths_dtype,
             },
-            children,
+            children.into(),
             StatsSet::new(),
         )
     }

encodings/zigzag/src/zigzag.rs

@@ -33,7 +33,7 @@ impl ZigZagArray {
             .with_nullability(encoded_dtype.nullability());
 
         let len = encoded.len();
-        let children = [encoded];
+        let children = vec![encoded];
 
         Self::try_from_parts(dtype, len, ZigZagMetadata, children.into(), StatsSet::new())
     }

vortex-array/src/array/constant/mod.rs

@@ -46,7 +46,7 @@ impl ConstantArray {
                 scalar: scalar.clone(),
                 length,
             },
-            [].into(),
+            vec![].into(),
             stats,
         )
         .unwrap_or_else(|err| {

vortex-array/src/array/extension/mod.rs

@@ -26,7 +26,7 @@ impl ExtensionArray {
             ExtensionMetadata {
                 storage_dtype: storage.dtype().clone(),
             },
-            [storage].into(),
+            vec![storage].into(),
             Default::default(),
         )
         .vortex_expect("Invalid ExtensionArray")

vortex-array/src/array/null/mod.rs

@@ -1,5 +1,3 @@
-use std::sync::Arc;
-
 use serde::{Deserialize, Serialize};
 use vortex_dtype::DType;
 use vortex_error::{VortexExpect as _, VortexResult};
@@ -26,7 +24,7 @@ impl NullArray {
             DType::Null,
             len,
             NullMetadata { len },
-            Arc::new([]),
+            vec![].into(),
             StatsSet::nulls(len, &DType::Null),
         )
         .vortex_expect("NullArray::new should never fail!")

vortex-array/src/array/sparse/mod.rs

@@ -81,7 +81,7 @@ impl SparseArray {
                 len,
                 fill_value,
             },
-            [indices, values].into(),
+            vec![indices, values].into(),
             StatsSet::new(),
         )
     }

vortex-array/src/data.rs

@@ -5,6 +5,7 @@ use vortex_dtype::DType;
 use vortex_error::{vortex_panic, VortexResult};
 use vortex_scalar::Scalar;
 
+use crate::arc_slice::SharedVec;
 use crate::encoding::EncodingRef;
 use crate::stats::{Stat, Statistics, StatsSet};
 use crate::{Array, ArrayDType, ArrayMetadata, ToArray};
@@ -16,7 +17,7 @@ pub struct ArrayData {
     len: usize,
     metadata: Arc<dyn ArrayMetadata>,
     buffer: Option<Buffer>,
-    children: Arc<[Array]>,
+    children: SharedVec<Array>,
     stats_map: Arc<RwLock<StatsSet>>,
 }
 
@@ -27,7 +28,7 @@ impl ArrayData {
         len: usize,
         metadata: Arc<dyn ArrayMetadata>,
         buffer: Option<Buffer>,
-        children: Arc<[Array]>,
+        children: SharedVec<Array>,
         statistics: StatsSet,
     ) -> VortexResult<Self> {
         let data = Self {

vortex-array/src/implementation.rs

@@ -64,7 +64,7 @@ macro_rules! impl_encoding {
                     dtype: vortex_dtype::DType,
                     len: usize,
                     metadata: [<$Name Metadata>],
-                    children: std::sync::Arc<[$crate::Array]>,
+                    children: $crate::arc_slice::SharedVec<$crate::Array>,
                     stats: $crate::stats::StatsSet,
                 ) -> VortexResult<Self> {
                     Ok(Self { typed: $crate::TypedArray::try_from_parts(dtype, len, metadata, None, children, stats)? })

vortex-array/src/lib.rs

@@ -35,7 +35,7 @@ use crate::variants::ArrayVariants;
 use crate::visitor::{AcceptArrayVisitor, ArrayVisitor};
 
 pub mod accessor;
-mod arc_slice;
+pub mod arc_slice;
 pub mod array;
 pub mod arrow;
 mod canonical;

vortex-array/src/typed.rs

@@ -4,6 +4,7 @@ use vortex_buffer::Buffer;
 use vortex_dtype::DType;
 use vortex_error::{vortex_bail, vortex_panic, VortexError, VortexResult};
 
+use crate::arc_slice::SharedVec;
 use crate::stats::StatsSet;
 use crate::{Array, ArrayData, ArrayDef, IntoArray, ToArray, TryDeserializeArrayMetadata};
 
@@ -19,7 +20,7 @@ impl<D: ArrayDef> TypedArray<D> {
         len: usize,
         metadata: D::Metadata,
         buffer: Option<Buffer>,
-        children: Arc<[Array]>,
+        children: SharedVec<Array>,
         stats: StatsSet,
     ) -> VortexResult<Self> {
         let array = Array::Data(ArrayData::try_new(

vortex-dtype/src/dtype.rs

@@ -190,6 +190,7 @@ impl StructDType {
                 }
             };
 
+            // TODO: do this without the extra allocations.
             names.push(self.names[idx].clone());
             dtypes.push(self.dtypes[idx].clone());
         }