[Variant] Introduce parquet-variant-json crate

.github/workflows/parquet-variant.yml

@@ -46,8 +46,10 @@ jobs:
           submodules: true
       - name: Setup Rust toolchain
         uses: ./.github/actions/setup-builder
-      - name: Test
+      - name: Test parquet-variant
         run: cargo test -p parquet-variant
+      - name: Test parquet-variant-json
+        run: cargo test -p parquet-variant-json
 
   # test compilation
   linux-features:
@@ -63,6 +65,8 @@ jobs:
         uses: ./.github/actions/setup-builder
       - name: Check compilation
         run: cargo check -p parquet-variant
+      - name: Check compilation
+        run: cargo check -p parquet-variant-json
 
   clippy:
     name: Clippy
@@ -77,3 +81,5 @@ jobs:
         run: rustup component add clippy
       - name: Run clippy
         run: cargo clippy -p parquet-variant --all-targets --all-features -- -D warnings
+      - name: Run clippy
+        run: cargo clippy -p parquet-variant-json --all-targets --all-features -- -D warnings

Cargo.toml

@@ -40,6 +40,7 @@ members = [
     "arrow-string",
     "parquet",
     "parquet-variant",
+    "parquet-variant-json",
     "parquet_derive",
     "parquet_derive_test",
 ]
@@ -96,6 +97,10 @@ arrow-select = { version = "55.2.0", path = "./arrow-select" }
 arrow-string = { version = "55.2.0", path = "./arrow-string" }
 parquet = { version = "55.2.0", path = "./parquet", default-features = false }
 
+# These crates have not yet been released and thus do not use the workspace version
+parquet-variant = { version = "0.1.0", path = "./parquet-variant"}
+parquet-variant-json = { version = "0.1.0", path = "./parquet-variant-json" }
+
 chrono = { version = "0.4.40", default-features = false, features = ["clock"] }
 
 # release inherited profile keeping debug information and symbols

parquet-variant-json/Cargo.toml

@@ -0,0 +1,50 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+[package]
+name = "parquet-variant-json"
+# This package is still in development and thus the version does
+# not follow the versions of the rest of the crates in this repo.
+version = "0.1.0"
+license = { workspace = true }
+description = "Apache Parquet Variant to/from JSON"
+homepage = { workspace = true }
+repository = { workspace = true }
+authors = { workspace = true }
+keywords = ["arrow", "parquet", "variant"]
+readme = "README.md"
+edition = { workspace = true }
+# needs a newer version than workspace due to
+# rror: `Option::<T>::unwrap` is not yet stable as a const fn
+rust-version = "1.83"
+
+
+[dependencies]
+arrow-schema = { workspace = true }
+parquet-variant = { path = "../parquet-variant" }
+chrono = { workspace = true }
+serde_json = "1.0"
+base64 = "0.22"
+indexmap = "2.10.0"
+
+
+[lib]
+name = "parquet_variant_json"
+bench = false
+
+[dev-dependencies]
+