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# Apache Spark Connect Client for Rust
This project houses the **experimental** client for [Spark
Connect](https://spark.apache.org/docs/latest/spark-connect-overview.html) for
[Apache Spark](https://spark.apache.org/) written in [Rust](https://www.rust-lang.org/)
## Current State of the Project
Currently, the Spark Connect client for Rust is **highly experimental** and **should
not be used in any production setting**. This is currently a "proof of concept" to identify the methods
of interacting with Spark cluster from rust.
## Quick Start
The `spark-connect-rs` aims to provide an entrypoint to [Spark Connect](https://spark.apache.org/docs/latest/spark-connect-overview.html), and provide *similar* DataFrame API interactions.
```bash
docker compose up --build -d
```
```rust
use spark_connect_rs;
use spark_connect_rs::{SparkSession, SparkSessionBuilder};
use spark_connect_rs::functions as F;
#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
let spark: SparkSession = SparkSessionBuilder::remote("sc://127.0.0.1:15002/")
.build()
.await?;
let mut df = spark
.sql("SELECT * FROM json.`/opt/spark/examples/src/main/resources/employees.json`")
.await?;
df.filter("salary >= 3500")
.select(F::col("name"))
.show(Some(5), None, None)
.await?;
// +-------------+
// | show_string |
// +-------------+
// | +------+ |
// | |name | |
// | +------+ |
// | |Andy | |
// | |Justin| |
// | |Berta | |
// | +------+ |
// | |
// +-------------+
Ok(())
}
```
## Getting Started
```
git clone https://github.com/sjrusso8/spark-connect-rs.git
git submodule update --init --recursive
docker compose up --build -d
cargo build && cargo test
```
## Features
The following section outlines some of the larger functionality that
is not yet working with this Spark Connect implementation.
- ![done] TLS authentication & Databricks compatability
- ![open] streaming implementation
- ![open] groupBy, aggregation, and window functions
- ![open] better error handling
- ![open] converting RecordBatch output into a polars DataFrame
### SparkSession
[Spark Session](https://spark.apache.org/docs/latest/api/python/reference/pyspark.sql/spark_session.html) type object and its implemented traits
| SparkSession | API | Comment |
|--------------------|---------|-----------------------------------------------|
| active | ![open] | |
| appName | ![open] | |
| catalog | ![open] | Partial. Only Get/List traits are implemented |
| createDataFrame | ![open] | |
| range | ![done] | |
| read | ![done] | |
| readStream | ![open] | streaming is currently in progress |
| sql | ![done] | |
| stop | ![open] | |
| streams | ![open] | streaming is currently in progress |
| table | ![open] | |
| version | ![open] | |
| addArtifact(s) | ![open] | |
| interruptAll | ![open] | |
| interruptTag | ![open] | |
| interruptOperation | ![open] | |
| addTag | ![open] | |
| removeTag | ![open] | |
| getTags | ![open] | |
| clearTags | ![open] | |
### DataFrame
Spark [DataFrame](https://spark.apache.org/docs/latest/api/python/reference/pyspark.sql/dataframe.html) type object and its implemented traits
| DataFrame | API | Comment |
|-------------------------------|---------|------------------------------------------------------------|
| agg | ![open] | groupby and aggregrate functions are currently in progress |
| alias | ![done] | |
| approxQuantile | ![open] | |
| cache | ![done] | |
| checkpoint | ![open] | |
| coalesce | ![done] | |
| colRegex | ![done] | |
| collect | ![done] | |
| columns | ![done] | |
| corr | ![done] | |
| count | ![open] | groupby and aggregrate functions are currently in progress |
| cov | ![done] | |
| createGlobalTempView | ![done] | |
| createOrReplaceGlobalTempView | ![done] | |
| createOrReplaceTempView | ![done] | |
| createTempView | ![done] | |
| crossJoin | ![done] | |
| crosstab | ![done] | |
| cube | ![done] | |
| describe | ![done] | |
| distinct | ![done] | |
| drop | ![done] | |
| dropDuplicates | ![done] | |
| dropDuplicatesWithinWatermark | ![open] | Windowing functions are currently in progress |
| drop_duplicates | ![done] | |
| dropna | ![done] | |
| dtypes | ![done] | |
| exceptAll | ![done] | |
| explain | ![done] | |
| fillna | ![open] | |
| filter | ![done] | |
| first | ![done] | |
| foreach | ![open] | |
| foreachPartition | ![open] | |
| freqItems | ![done] | |
| groupBy | ![open] | groupby and aggregrate functions are currently in progress |
| head | ![done] | |
| hint | ![done] | |
| inputFiles | ![done] | |
| intersect | ![done] | |
| intersectAll | ![done] | |
| isEmpty | ![done] | |
| isLocal | ![open] | |
| isStreaming | ![open] | streaming is currently in progress |
| join | ![done] | |
| limit | ![done] | |
| localCheckpoint | ![open] | |
| mapInPandas | ![open] | TBD on this exact implementation |
| mapInArrow | ![open] | TBD on this exact implementation |
| melt | ![open] | groupby and aggregrate functions are currently in progress |
| na | ![open] | |
| observe | ![open] | |
| offset | ![done] | |
| orderBy | ![done] | |
| persist | ![done] | |
| printSchema | ![done] | |
| randomSplit | ![open] | |
| registerTempTable | ![open] | |
| repartition | ![done] | |
| repartitionByRange | ![open] | |
| replace | ![open] | |
| rollup | ![open] | |
| sameSemantics | ![done] | |
| sample | ![done] | |
| sampleBy | ![open] | |
| schema | ![done] | |
| select | ![done] | |
| selectExpr | ![done] | |
| semanticHash | ![done] | |
| show | ![done] | |
| sort | ![done] | |
| sortWithinPartitions | ![done] | |
| sparkSession | ![done] | |
| stat | ![done] | |
| storageLevel | ![done] | |
| subtract | ![done] | |
| summary | ![open] | |
| tail | ![done] | |
| take | ![done] | |
| to | ![done] | |
| toDF | ![done] | |
| toJSON | ![open] | |
| toLocalIterator | ![open] | |
| toPandas | ![open] | TBD on this exact implementation. Might be toPolars |
| transform | ![open] | |
| union | ![done] | |
| unionAll | ![done] | |
| unionByName | ![done] | |
| unpersist | ![done] | |
| unpivot | ![open] | |
| where | ![done] | use `sort` where is a keyword for rust |
| withColumn | ![done] | |
| withColumns | ![done] | |
| withColumnRenamed | ![open] | |
| withColumnsRenamed | ![done] | |
| withMetadata | ![open] | |
| withWatermark | ![open] | |
| write | ![done] | |
| writeStream | ![open] | streaming is currently in progress |
| writeTo | ![open] | |
### DataFrameWriter
Spark Connect *should* respect the format as long as your cluster supports the specified type and has the
required jars
| DataFrameWriter | API | Comment |
|-----------------|---------|------------------------------------------------------------------------------|
| format | ![done] | |
| option | ![done] | |
| options | ![done] | |
| mode | ![done] | |
| bucketBy | ![done] | |
| sortBy | ![done] | |
| partitionBy | ![done] | |
| save | ![done] | |
| saveAsTable | ![done] | |
| insertInto | ![done] | |
### Column
Spark [Column](https://spark.apache.org/docs/latest/api/python/reference/pyspark.sql/column.html) type object and its implemented traits
| Column | API | Comment |
|------------------|---------|------------------------------------------------------------------------------|
| alias | ![done] | |
| asc | ![done] | |
| asc_nulls_first | ![done] | |
| asc_nulls_last | ![done] | |
| astype | ![open] | |
| between | ![open] | |
| cast | ![done] | |
| contains | ![done] | |
| desc | ![done] | |
| desc_nulls_first | ![done] | |
| desc_nulls_last | ![done] | |
| dropFields | ![open] | |
| endswith | ![done] | |
| ilike | ![done] | |
| isNotNull | ![done] | |
| isNull | ![done] | |
| isin | ![done] | |
| like | ![done] | |
| name | ![done] | |
| otherwise | ![open] | |
| rlike | ![done] | |
| startswith | ![done] | |
| substr | ![open] | |
| when | ![open] | |
| eq `==` | ![done] | Rust does not like when you try to overload `==` and return something other than a `bool`. Currently implemented column equality like `col('name').eq(col('id'))`. Not the best, but it works for now |
| addition `+` | ![done] | |
| subtration `-` | ![done] | |
| multiplication `*` | ![done] | |
| division `/` | ![done] | |
| OR `\|` | ![done] | |
| AND `&` | ![done] | |
| XOR `^` | ![done] | |
| Negate `~` | ![done] | |
### Functions
Only a few of the functions are covered by unit tests.
| Functions | API | Comment |
|-----------------------------|---------|---------|
| abs | ![done] | |
| acos | ![open] | |
| acosh | ![open] | |
| add_months | ![done] | |
| aggregate | ![open] | |
| approxCountDistinct | ![open] | |
| approx_count_distinct | ![open] | |
| array | ![done] | |
| array_append | ![open] | |
| array_compact | ![done] | |
| array_contains | ![open] | |
| array_distinct | ![done] | |
| array_except | ![done] | |
| array_insert | ![open] | |
| array_intersect | ![done] | |
| array_join | ![open] | |
| array_max | ![done] | |
| array_min | ![done] | |
| array_position | ![open] | |
| array_remove | ![open] | |
| array_repeat | ![open] | |
| array_sort | ![open] | |
| array_union | ![done] | |
| arrays_overlap | ![open] | |
| arrays_zip | ![done] | |
| asc | ![done] | |
| asc_nulls_first | ![done] | |
| asc_nulls_last | ![done] | |
| ascii | ![done] | |
| asin | ![open] | |
| asinh | ![open] | |
| assert_true | ![open] | |
| atan | ![open] | |
| atan2 | ![open] | |
| atanh | ![open] | |
| avg | ![open] | |
| base64 | ![done] | |
| bin | ![done] | |
| bit_length | ![done] | |
| bitwiseNOT | ![open] | |
| bitwise_not | ![done] | |
| broadcast | ![open] | |
| bround | ![open] | |
| bucket | ![open] | |
| call_udf | ![open] | |
| cast | ![open] | |
| cbrt | ![open] | |
| ceil | ![done] | |
| coalesce | ![done] | |
| col | ![done] | |
| collect_list | ![open] | |
| collect_set | ![open] | |
| column | ![done] | |
| concat | ![done] | |
| concat_ws | ![open] | |
| conv | ![open] | |
| corr | ![open] | |
| cos | ![open] | |
| cosh | ![open] | |
| cot | ![open] | |
| count | ![open] | |
| countDistinct | ![open] | |
| count_distinct | ![open] | |
| covar_pop | ![open] | |
| covar_samp | ![open] | |
| crc32 | ![done] | |
| create_map | ![done] | |
| csc | ![open] | |
| cume_dist | ![done] | |
| current_date | ![done] | |
| current_timestamp | ![open] | |
| date_add | ![done] | |
| date_format | ![open] | |
| date_sub | ![done] | |
| date_trunc | ![open] | |
| datediff | ![done] | |
| dayofmonth | ![done] | |
| dayofweek | ![done] | |
| dayofyear | ![done] | |
| days | ![done] | |
| decode | ![open] | |
| degrees | ![open] | |
| dense_rank | ![done] | |
| desc | ![done] | |
| desc_nulls_first | ![done] | |
| desc_nulls_last | ![done] | |
| element_at | ![open] | |
| encode | ![open] | |
| exists | ![open] | |
| exp | ![done] | |
| explode | ![done] | |
| explode_outer | ![done] | |
| expm1 | ![open] | |
| expr | ![done] | |
| factorial | ![done] | |
| filter | ![open] | |
| first | ![open] | |
| flatten | ![done] | |
| floor | ![done] | |
| forall | ![open] | |
| format_number | ![open] | |
| format_string | ![open] | |
| from_csv | ![open] | |
| from_json | ![open] | |
| from_unixtime | ![open] | |
| from_utc_timestamp | ![open] | |
| functools | ![open] | |
| get | ![open] | |
| get_active_spark_context | ![open] | |
| get_json_object | ![open] | |
| greatest | ![done] | |
| grouping | ![open] | |
| grouping_id | ![open] | |
| has_numpy | ![open] | |
| hash | ![done] | |
| hex | ![open] | |
| hour | ![done] | |
| hours | ![done] | |
| hypot | ![open] | |
| initcap | ![done] | |
| inline | ![done] | |
| inline_outer | ![done] | |
| input_file_name | ![done] | |
| inspect | ![open] | |
| instr | ![open] | |
| isnan | ![done] | |
| isnull | ![done] | |
| json_tuple | ![open] | |
| kurtosis | ![open] | |
| lag | ![open] | |
| last | ![open] | |
| last_day | ![open] | |
| lead | ![open] | |
| least | ![done] | |
| length | ![done] | |
| levenshtein | ![open] | |
| lit | ![done] | |
| localtimestamp | ![open] | |
| locate | ![open] | |
| log | ![done] | |
| log10 | ![done] | |
| log1p | ![done] | |
| log2 | ![done] | |
| lower | ![done] | |
| lpad | ![open] | |
| ltrim | ![done] | |
| make_date | ![open] | |
| map_concat | ![done] | |
| map_contains_key | ![open] | |
| map_entries | ![done] | |
| map_filter | ![open] | |
| map_from_arrays | ![open] | |
| map_from_entries | ![done] | |
| map_keys | ![done] | |
| map_values | ![done] | |
| map_zip_with | ![open] | |
| max | ![open] | |
| max_by | ![open] | |
| md5 | ![done] | |
| mean | ![open] | |
| median | ![open] | |
| min | ![open] | |
| min_by | ![open] | |
| minute | ![done] | |
| mode | ![open] | |
| monotonically_increasing_id | ![done] | |
| month | ![done] | |
| months | ![done] | |
| months_between | ![open] | |
| nanvl | ![done] | |
| next_day | ![open] | |
| np | ![open] | |
| nth_value | ![open] | |
| ntile | ![open] | |
| octet_length | ![done] | |
| overlay | ![open] | |
| overload | ![open] | |
| pandas_udf | ![open] | |
| percent_rank | ![done] | |
| percentile_approx | ![open] | |
| pmod | ![open] | |
| posexplode | ![done] | |
| posexplode_outer | ![done] | |
| pow | ![done] | |
| product | ![open] | |
| quarter | ![done] | |
| radians | ![open] | |
| raise_error | ![open] | |
| rand | ![done] | |
| randn | ![done] | |
| rank | ![done] | |
| regexp_extract | ![open] | |
| regexp_replace | ![open] | |
| repeat | ![open] | |
| reverse | ![done] | |
| rint | ![open] | |
| round | ![done] | |
| row_number | ![done] | |
| rpad | ![open] | |
| rtrim | ![done] | |
| schema_of_csv | ![open] | |
| schema_of_json | ![open] | |
| sec | ![open] | |
| second | ![done] | |
| sentences | ![open] | |
| sequence | ![open] | |
| session_window | ![open] | |
| sha1 | ![done] | |
| sha2 | ![open] | |
| shiftLeft | ![open] | |
| shiftRight | ![open] | |
| shiftRightUnsigned | ![open] | |
| shiftleft | ![open] | |
| shiftright | ![open] | |
| shiftrightunsigned | ![open] | |
| shuffle | ![done] | |
| signum | ![open] | |
| sin | ![open] | |
| sinh | ![open] | |
| size | ![done] | |
| skewness | ![open] | |
| slice | ![open] | |
| sort_array | ![open] | |
| soundex | ![done] | |
| spark_partition_id | ![done] | |
| split | ![open] | |
| sqrt | ![done] | |
| stddev | ![open] | |
| stddev_pop | ![open] | |
| stddev_samp | ![open] | |
| struct | ![open] | |
| substring | ![open] | |
| substring_index | ![open] | |
| sum | ![open] | |
| sumDistinct | ![open] | |
| sum_distinct | ![open] | |
| sys | ![open] | |
| tan | ![open] | |
| tanh | ![open] | |
| timestamp_seconds | ![done] | |
| toDegrees | ![open] | |
| toRadians | ![open] | |
| to_csv | ![open] | |
| to_date | ![open] | |
| to_json | ![open] | |
| to_str | ![open] | |
| to_timestamp | ![open] | |
| to_utc_timestamp | ![open] | |
| transform | ![open] | |
| transform_keys | ![open] | |
| transform_values | ![open] | |
| translate | ![open] | |
| trim | ![done] | |
| trunc | ![open] | |
| try_remote_functions | ![open] | |
| udf | ![open] | |
| unbase64 | ![done] | |
| unhex | ![open] | |
| unix_timestamp | ![open] | |
| unwrap_udt | ![open] | |
| upper | ![done] | |
| var_pop | ![open] | |
| var_samp | ![open] | |
| variance | ![open] | |
| warnings | ![open] | |
| weekofyear | ![done] | |
| when | ![open] | |
| window | ![open] | |
| window_time | ![open] | |
| xxhash64 | ![done] | |
| year | ![done] | |
| years | ![done] | |
| zip_with | ![open] | |
[open]: https://cdn.jsdelivr.net/gh/Readme-Workflows/Readme-Icons@main/icons/octicons/IssueNeutral.svg
[done]: https://cdn.jsdelivr.net/gh/Readme-Workflows/Readme-Icons@main/icons/octicons/ApprovedChanges.svg