datafusion-java/native/src/json.rs at main · apache/datafusion-java · GitHub

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// 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.

use datafusion::common::config::JsonOptions;

use datafusion::common::parsers::CompressionTypeVariant;

use datafusion::dataframe::{DataFrame, DataFrameWriteOptions};

use datafusion::datasource::file_format::file_compression_type::FileCompressionType;

use datafusion::error::DataFusionError;

use datafusion::prelude::JsonReadOptions;

use datafusion::prelude::SessionContext;

use jni::objects::{JByteArray, JClass, JString};

use jni::sys::jlong;

use jni::JNIEnv;

use prost::Message;

use crate::proto_gen::{

FileCompressionType as ProtoFileCompressionType, JsonWriteOptionsProto, NdJsonReadOptionsProto,

};

use crate::runtime;

use crate::schema::decode_optional_schema;

use datafusion_jni_common::errors::{try_unwrap_or_throw, JniResult};

fn with_json_options<R>(

env: &mut JNIEnv,

options_bytes: JByteArray,

schema_ipc_bytes: JByteArray,

f: impl FnOnce(JsonReadOptions) -> JniResult<R>,

) -> JniResult<R> {

let bytes: Vec<u8> = env.convert_byte_array(&options_bytes)?;

let p = NdJsonReadOptionsProto::decode(bytes.as_slice())?;

let schema = decode_optional_schema(env, schema_ipc_bytes)?;

let compression = match p.file_compression_type() {

ProtoFileCompressionType::Unspecified => {

return Err("NdJsonReadOptionsProto.file_compression_type is UNSPECIFIED".into());

}

ProtoFileCompressionType::Uncompressed => FileCompressionType::UNCOMPRESSED,

ProtoFileCompressionType::Gzip => FileCompressionType::GZIP,

ProtoFileCompressionType::Bzip2 => FileCompressionType::BZIP2,

ProtoFileCompressionType::Xz => FileCompressionType::XZ,

ProtoFileCompressionType::Zstd => FileCompressionType::ZSTD,

};

let file_ext = p.file_extension;

let mut opts = JsonReadOptions::default()

.file_extension(&file_ext)

.file_compression_type(compression);

if let Some(n) = p.schema_infer_max_records {

opts = opts.schema_infer_max_records(n as usize);

}

if let Some(ref s) = schema {

opts = opts.schema(s);

}

f(opts)

}

#[no_mangle]

pub extern "system" fn Java_org_apache_datafusion_SessionContext_registerJsonWithOptions<'local>(

mut env: JNIEnv<'local>,

_class: JClass<'local>,

handle: jlong,

name: JString<'local>,

path: JString<'local>,

options_bytes: JByteArray<'local>,

schema_ipc_bytes: JByteArray<'local>,

) {

try_unwrap_or_throw(&mut env, (), |env| -> JniResult<()> {

if handle == 0 {

return Err("SessionContext handle is null".into());

}

let ctx = unsafe { &*(handle as *const SessionContext) };

let name: String = env.get_string(&name)?.into();

let path: String = env.get_string(&path)?.into();

with_json_options(env, options_bytes, schema_ipc_bytes, |opts| {

runtime().block_on(async {

ctx.register_json(&name, &path, opts).await?;

Ok::<(), DataFusionError>(())

})?;

Ok(())

})

}

#[no_mangle]

pub extern "system" fn Java_org_apache_datafusion_SessionContext_readJsonWithOptions<'local>(

mut env: JNIEnv<'local>,

_class: JClass<'local>,

handle: jlong,

path: JString<'local>,

options_bytes: JByteArray<'local>,

schema_ipc_bytes: JByteArray<'local>,

) -> jlong {

try_unwrap_or_throw(&mut env, 0, |env| -> JniResult<jlong> {

if handle == 0 {

return Err("SessionContext handle is null".into());

}

let ctx = unsafe { &*(handle as *const SessionContext) };

let path: String = env.get_string(&path)?.into();

with_json_options(env, options_bytes, schema_ipc_bytes, |opts| {

let df = runtime().block_on(ctx.read_json(path, opts))?;

Ok(Box::into_raw(Box::new(df)) as jlong)

})

}

fn proto_compression_to_variant(p: ProtoFileCompressionType) -> JniResult<CompressionTypeVariant> {

match p {

ProtoFileCompressionType::Unspecified => {

Err("JsonWriteOptionsProto.file_compression_type is UNSPECIFIED".into())

}

ProtoFileCompressionType::Uncompressed => Ok(CompressionTypeVariant::UNCOMPRESSED),

ProtoFileCompressionType::Gzip => Ok(CompressionTypeVariant::GZIP),

ProtoFileCompressionType::Bzip2 => Ok(CompressionTypeVariant::BZIP2),

ProtoFileCompressionType::Xz => Ok(CompressionTypeVariant::XZ),

ProtoFileCompressionType::Zstd => Ok(CompressionTypeVariant::ZSTD),

}

#[no_mangle]

pub extern "system" fn Java_org_apache_datafusion_DataFrame_writeJsonWithOptions<'local>(

mut env: JNIEnv<'local>,

_class: JClass<'local>,

handle: jlong,

path: JString<'local>,

options_bytes: JByteArray<'local>,

) {

try_unwrap_or_throw(&mut env, (), |env| -> JniResult<()> {

if handle == 0 {

return Err("DataFrame handle is null".into());

}

let df = unsafe { &*(handle as *const DataFrame) }.clone();

let path: String = env.get_string(&path)?.into();

let bytes: Vec<u8> = env.convert_byte_array(&options_bytes)?;

let p = JsonWriteOptionsProto::decode(bytes.as_slice())?;

// Decode the file_compression_type field eagerly so an unknown wire

// value surfaces as a clear error rather than a silent default.

let compression = if p.file_compression_type.is_some() {

Some(proto_compression_to_variant(p.file_compression_type())?)

} else {

None

};

// When the caller left `singleFileOutput` unset, force directory output (`false`)

// rather than leaving DataFusion in `Automatic` mode. Automatic mode treats paths

// with an extension (e.g. `out.json`) as single-file targets, which would silently

// contradict the documented "directory unless overridden" default and surprise any

// caller that hands writeJson a `.json` path.

let mut write_opts = DataFrameWriteOptions::new()

.with_single_file_output(p.single_file_output.unwrap_or(false));

if !p.partition_cols.is_empty() {

write_opts = write_opts.with_partition_by(p.partition_cols.clone());

}

// Build JsonOptions only when a writer-side knob is set, so the

// DataFusion default is preserved when the caller passes

// `new JsonWriteOptions()`. JsonOptions has no fluent setters --

// the fields are public, so use struct-update syntax (same

// idiom we use for ArrowReadOptions / AvroReadOptions).

let writer_opts: Option<JsonOptions> = compression.map(|c| JsonOptions {

compression: c,

..JsonOptions::default()

});

runtime().block_on(df.write_json(&path, write_opts, writer_opts))?;

Ok(())

})

}

datafusion-java/native/src/json.rs at main · apache/datafusion-java · GitHub

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