Add Map core edition

Signed-off-by: Adam Gutglick <adam@spiraldb.com>

Author: AdamGS

vortex-python/src/io.rs

@@ -303,7 +303,7 @@ impl PyVortexWriteOptions {
     /// >>> vx.io.VortexWriteOptions.default().write(sprl, "chonky.vortex")
     /// >>> import os
     /// >>> os.path.getsize('chonky.vortex')
-    /// 215900
+    /// 215932
     ///
     /// Wow, Vortex manages to use about two bytes per integer! So advanced. So tiny.
     ///
@@ -313,7 +313,7 @@ impl PyVortexWriteOptions {
     ///
     /// >>> vx.io.VortexWriteOptions.compact().write(sprl, "tiny.vortex")
     /// >>> os.path.getsize('tiny.vortex')
-    /// 55028
+    /// 55060
     ///
     /// Random numbers are not (usually) composed of random bytes!
     #[staticmethod]

vortex-sqllogictest/slt/datafusion/map_roundtrip.slt

@@ -0,0 +1,43 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright the Vortex contributors
+
+include ../setup.slt.no
+
+query I
+COPY (
+  SELECT id, map(keys, vals) AS attrs
+  FROM (VALUES
+    (1, [1, 2], ['one', CAST(NULL AS VARCHAR)]),
+    (2, [], []),
+    (3, [3], ['three'])
+  ) AS t(id, keys, vals)
+) TO '${WORK_DIR}/datafusion/map_roundtrip/maps.vortex'
+STORED AS VORTEX;
+----
+3
+
+statement ok
+CREATE VIEW map_rows AS SELECT * FROM '${WORK_DIR}/datafusion/map_roundtrip/maps.vortex';
+
+query I? rowsort
+SELECT id, attrs FROM map_rows;
+----
+1 {1: one, 2: NULL}
+2 {}
+3 {3: three}
+
+query II??? rowsort
+SELECT
+  id,
+  cardinality(attrs),
+  map_keys(attrs),
+  map_values(attrs),
+  map_extract(attrs, 2)
+FROM map_rows;
+----
+1 2 [1, 2] [one, NULL] [NULL]
+2 0 [] [] [NULL]
+3 1 [3] [three] [NULL]
+
+statement ok
+DROP VIEW map_rows;

vortex/src/editions/core/mod.rs

@@ -10,8 +10,10 @@ pub mod v2025_05;
 pub mod v2025_06;
 pub mod v2025_10;
 pub mod v2026_07;
+pub mod v2026_08_1;
 
 pub use v2025_05::CORE_2025_05_0;
 pub use v2025_06::CORE_2025_06_0;
 pub use v2025_10::CORE_2025_10_0;
 pub use v2026_07::CORE_2026_07_0;
+pub use v2026_08_1::CORE_2026_08_1;

vortex/src/editions/core/v2026_08_1.rs

@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: Copyright the Vortex contributors
+
+//! The August 2026 core edition revision adding the canonical Map encoding.
+
+use vortex_edition::Edition;
+use vortex_edition::EditionDeclaration;
+use vortex_edition::EditionId;
+
+/// The August 2026 core edition revision containing canonical Map arrays.
+pub const CORE_2026_08_1: EditionId = EditionId::new("core", 2026, 8, 1);
+
+/// The declaration of [`CORE_2026_08_1`] and the encodings that join the family at it.
+pub static DECLARATION: EditionDeclaration = EditionDeclaration {
+    edition: Edition {
+        id: CORE_2026_08_1,
+        min_vortex_version: Some("0.84.0"),
+    },
+    added: &[&"vortex.map"],
+};

vortex/src/editions/mod.rs

@@ -9,7 +9,7 @@
 //! policy with [`crate::editions::enable_default_editions`].
 //!
 //! The default file writer resolves the session's enabled editions at write time. The
-//! facade enables the newest frozen `core` edition, [`crate::editions::CORE_2026_07_0`], and
+//! facade enables the newest frozen `core` edition, [`crate::editions::CORE_2026_08_1`], and
 //! additionally enables the latest unstable edition when the `unstable_encodings` feature is
 //! selected.
 
@@ -33,13 +33,14 @@ pub use self::core::CORE_2025_05_0;
 pub use self::core::CORE_2025_06_0;
 pub use self::core::CORE_2025_10_0;
 pub use self::core::CORE_2026_07_0;
+pub use self::core::CORE_2026_08_1;
 pub use self::unstable::UNSTABLE_2025_05_0;
 pub use self::unstable::UNSTABLE_2026_02_0;
 pub use self::unstable::UNSTABLE_2026_04_0;
 pub use self::unstable::UNSTABLE_2026_06_0;
 
 /// The `core` edition enabled for writing by the default Vortex session.
-pub const DEFAULT_CORE_EDITION: EditionId = CORE_2026_07_0;
+pub const DEFAULT_CORE_EDITION: EditionId = CORE_2026_08_1;
 
 /// The `unstable` edition enabled for writing by the default Vortex session when the
 /// `unstable_encodings` feature is selected.
@@ -51,6 +52,7 @@ pub static EDITION_DECLARATIONS: &[&EditionDeclaration] = &[
     &core::v2025_06::DECLARATION,
     &core::v2025_10::DECLARATION,
     &core::v2026_07::DECLARATION,
+    &core::v2026_08_1::DECLARATION,
     &unstable::v2025_05::DECLARATION,
     &unstable::v2026_02::DECLARATION,
     &unstable::v2026_04::DECLARATION,

vortex/src/editions/tests.rs

@@ -39,6 +39,7 @@ use vortex_utils::aliases::hash_set::HashSet;
 
 use super::CORE_2025_05_0;
 use super::CORE_2026_07_0;
+use super::CORE_2026_08_1;
 use super::DEFAULT_CORE_EDITION;
 use super::DEFAULT_UNSTABLE_EDITION;
 use super::EDITION_DECLARATIONS;
@@ -138,7 +139,7 @@ fn encodings_in_editions_unions_families() {
 fn earlier_editions_are_subsets() {
     let session = session().unwrap_or_else(|e| panic!("registering editions: {e}"));
     let first = session.encodings_in(&CORE_2025_05_0);
-    let latest = session.encodings_in(&CORE_2026_07_0);
+    let latest = session.encodings_in(&CORE_2026_08_1);
     assert!(first.iter().all(|inclusion| {
         latest
             .iter()
@@ -169,7 +170,7 @@ fn core_edition_ids_are_registered_array_encodings() {
 
     let session = VortexSession::default();
     let registry = session.arrays().registry().clone();
-    for inclusion in session.editions().encodings_in(&CORE_2026_07_0) {
+    for inclusion in session.editions().encodings_in(&CORE_2026_08_1) {
         assert!(
             registry.contains_key(&inclusion.encoding_id),
             "{} is declared in core but not registered as an array encoding",