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Expose polars avro support (#10019)
# Description Exposes polars avro support via dfr open and dfr to-avro --------- Co-authored-by: Jack Wright <jack.wright@disqo.com>
This commit is contained in:
Jack Wright
GitHub
parent
3ed45c7ba8
commit
7a123d3eb1
63
Cargo.lock
generated
63
Cargo.lock
generated
@ -27,6 +27,12 @@ version = "1.0.2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
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[[package]]
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name = "adler32"
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version = "1.2.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "aae1277d39aeec15cb388266ecc24b11c80469deae6067e17a1a7aa9e5c1f234"
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[[package]]
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name = "ahash"
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version = "0.8.3"
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@ -166,6 +172,7 @@ checksum = "15ae0428d69ab31d7b2adad22a752d6f11fef2e901d2262d0cad4f5cb08b7093"
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dependencies = [
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"ahash",
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"arrow-format",
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"avro-schema",
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"base64",
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"bytemuck",
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"chrono",
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@ -273,6 +280,20 @@ version = "1.1.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
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[[package]]
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name = "avro-schema"
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version = "0.3.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "b5281855b39aba9684d2f47bf96983fbfd8f1725f12fabb0513a8ab879647bbd"
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dependencies = [
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"crc",
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"fallible-streaming-iterator",
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"libflate",
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"serde",
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"serde_json",
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"snap",
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]
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[[package]]
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name = "backtrace"
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version = "0.3.68"
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@ -740,6 +761,21 @@ dependencies = [
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"libc",
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]
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[[package]]
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name = "crc"
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version = "2.1.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "49fc9a695bca7f35f5f4c15cddc84415f66a74ea78eef08e90c5024f2b540e23"
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dependencies = [
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"crc-catalog",
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]
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[[package]]
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name = "crc-catalog"
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version = "1.1.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "ccaeedb56da03b09f598226e25e80088cb4cd25f316e6e4df7d695f0feeb1403"
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[[package]]
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name = "crc32fast"
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version = "1.3.2"
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@ -2022,6 +2058,26 @@ version = "0.2.147"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "b4668fb0ea861c1df094127ac5f1da3409a82116a4ba74fca2e58ef927159bb3"
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[[package]]
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name = "libflate"
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version = "1.4.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "5ff4ae71b685bbad2f2f391fe74f6b7659a34871c08b210fdc039e43bee07d18"
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dependencies = [
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"adler32",
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"crc32fast",
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"libflate_lz77",
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]
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[[package]]
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name = "libflate_lz77"
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version = "1.2.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "a52d3a8bfc85f250440e4424db7d857e241a3aebbbe301f3eb606ab15c39acbf"
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dependencies = [
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"rle-decode-fast",
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]
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[[package]]
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name = "libgit2-sys"
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version = "0.15.2+1.6.4"
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@ -2604,6 +2660,7 @@ dependencies = [
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"nu-test-support",
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"num 0.4.0",
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"polars",
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"polars-io",
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"serde",
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"sqlparser",
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]
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@ -4189,6 +4246,12 @@ version = "1.8.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "4bf2521270932c3c7bed1a59151222bd7643c79310f2916f01925e1e16255698"
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[[package]]
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name = "rle-decode-fast"
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version = "1.0.3"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "3582f63211428f83597b51b2ddb88e2a91a9d52d12831f9d08f5e624e8977422"
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[[package]]
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name = "rmp"
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version = "0.8.11"
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@ -24,6 +24,7 @@ indexmap = { version = "2.0" }
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num = { version = "0.4", optional = true }
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serde = { version = "1.0", features = ["derive"] }
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sqlparser = { version = "0.34", features = ["serde"], optional = true }
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polars-io = { version = "0.30.0", features = ["avro"] }
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[dependencies.polars]
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features = [
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@ -50,7 +51,7 @@ features = [
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"serde",
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"serde-lazy",
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"strings",
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"to_dummies",
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"to_dummies"
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]
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optional = true
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version = "0.30.0"
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@ -22,6 +22,7 @@ mod sql_expr;
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mod summary;
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mod take;
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mod to_arrow;
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mod to_avro;
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mod to_csv;
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mod to_df;
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mod to_json_lines;
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@ -55,6 +56,7 @@ pub use sql_expr::parse_sql_expr;
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pub use summary::Summary;
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pub use take::TakeDF;
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pub use to_arrow::ToArrow;
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pub use to_avro::ToAvro;
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pub use to_csv::ToCSV;
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pub use to_df::ToDataFrame;
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pub use to_json_lines::ToJsonLines;
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@ -96,6 +98,7 @@ pub fn add_eager_decls(working_set: &mut StateWorkingSet) {
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SliceDF,
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TakeDF,
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ToArrow,
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ToAvro,
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ToCSV,
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ToDataFrame,
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ToNu,
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@ -13,6 +13,8 @@ use polars::prelude::{
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LazyFrame, ParallelStrategy, ParquetReader, ScanArgsIpc, ScanArgsParquet, SerReader,
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};
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use polars_io::avro::AvroReader;
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#[derive(Clone)]
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pub struct OpenDataFrame;
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@ -22,7 +24,7 @@ impl Command for OpenDataFrame {
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}
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fn usage(&self) -> &str {
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"Opens CSV, JSON, JSON lines, arrow, or parquet file to create dataframe."
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"Opens CSV, JSON, JSON lines, arrow, avro, or parquet file to create dataframe."
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}
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fn signature(&self) -> Signature {
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@ -36,7 +38,7 @@ impl Command for OpenDataFrame {
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.named(
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"type",
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SyntaxShape::String,
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"File type: csv, tsv, json, parquet, arrow. If omitted, derive from file extension",
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"File type: csv, tsv, json, parquet, arrow, avro. If omitted, derive from file extension",
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Some('t'),
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)
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.named(
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@ -118,6 +120,7 @@ fn command(
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"ipc" | "arrow" => from_ipc(engine_state, stack, call),
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"json" => from_json(engine_state, stack, call),
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"jsonl" => from_jsonl(engine_state, stack, call),
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"avro" => from_avro(engine_state, stack, call),
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_ => Err(ShellError::FileNotFoundCustom(
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format!("{msg}. Supported values: csv, tsv, parquet, ipc, arrow, json"),
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blamed,
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@ -199,6 +202,46 @@ fn from_parquet(
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}
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}
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fn from_avro(
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engine_state: &EngineState,
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stack: &mut Stack,
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call: &Call,
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) -> Result<Value, ShellError> {
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let file: Spanned<PathBuf> = call.req(engine_state, stack, 0)?;
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let columns: Option<Vec<String>> = call.get_flag(engine_state, stack, "columns")?;
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let r = File::open(&file.item).map_err(|e| {
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ShellError::GenericError(
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"Error opening file".into(),
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e.to_string(),
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Some(file.span),
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None,
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Vec::new(),
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)
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})?;
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let reader = AvroReader::new(r);
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let reader = match columns {
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None => reader,
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Some(columns) => reader.with_columns(Some(columns)),
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};
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let df: NuDataFrame = reader
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.finish()
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.map_err(|e| {
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ShellError::GenericError(
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"Avro reader error".into(),
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format!("{e:?}"),
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Some(call.head),
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None,
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Vec::new(),
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)
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})?
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.into();
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Ok(df.into_value(call.head))
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}
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fn from_ipc(
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engine_state: &EngineState,
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stack: &mut Stack,
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122
crates/nu-cmd-dataframe/src/dataframe/eager/to_avro.rs
Normal file
122
crates/nu-cmd-dataframe/src/dataframe/eager/to_avro.rs
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@ -0,0 +1,122 @@
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use std::{fs::File, path::PathBuf};
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use nu_engine::CallExt;
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use nu_protocol::{
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ast::Call,
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engine::{Command, EngineState, Stack},
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Category, Example, PipelineData, ShellError, Signature, Spanned, SyntaxShape, Type, Value,
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};
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use polars_io::avro::{AvroCompression, AvroWriter};
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use polars_io::SerWriter;
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use super::super::values::NuDataFrame;
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#[derive(Clone)]
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pub struct ToAvro;
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impl Command for ToAvro {
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fn name(&self) -> &str {
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"dfr to-avro"
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}
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fn usage(&self) -> &str {
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"Saves dataframe to avro file."
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}
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fn signature(&self) -> Signature {
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Signature::build(self.name())
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.named(
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"compression",
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SyntaxShape::String,
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"use compression, supports deflate or snappy",
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Some('c'),
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)
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.required("file", SyntaxShape::Filepath, "file path to save dataframe")
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.input_output_type(Type::Custom("dataframe".into()), Type::Any)
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.category(Category::Custom("dataframe".into()))
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}
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fn examples(&self) -> Vec<Example> {
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vec![Example {
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description: "Saves dataframe to avro file",
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example: "[[a b]; [1 2] [3 4]] | dfr into-df | dfr to-avro test.avro",
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result: None,
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}]
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}
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fn run(
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&self,
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engine_state: &EngineState,
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stack: &mut Stack,
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call: &Call,
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input: PipelineData,
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) -> Result<PipelineData, ShellError> {
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command(engine_state, stack, call, input)
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}
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}
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fn get_compression(call: &Call) -> Result<Option<AvroCompression>, ShellError> {
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if let Some((compression, span)) = call
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.get_flag_expr("compression")
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.and_then(|e| e.as_string().map(|s| (s, e.span)))
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{
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match compression.as_ref() {
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"snappy" => Ok(Some(AvroCompression::Snappy)),
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"deflate" => Ok(Some(AvroCompression::Deflate)),
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_ => Err(ShellError::IncorrectValue {
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msg: "compression must be one of deflate or snappy".to_string(),
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span,
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}),
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}
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} else {
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Ok(None)
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}
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}
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fn command(
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engine_state: &EngineState,
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stack: &mut Stack,
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call: &Call,
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input: PipelineData,
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) -> Result<PipelineData, ShellError> {
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let file_name: Spanned<PathBuf> = call.req(engine_state, stack, 0)?;
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let compression = get_compression(call)?;
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let mut df = NuDataFrame::try_from_pipeline(input, call.head)?;
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let file = File::create(&file_name.item).map_err(|e| {
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ShellError::GenericError(
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"Error with file name".into(),
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e.to_string(),
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Some(file_name.span),
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None,
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Vec::new(),
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)
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})?;
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AvroWriter::new(file)
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.with_compression(compression)
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.finish(df.as_mut())
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.map_err(|e| {
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ShellError::GenericError(
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"Error saving file".into(),
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e.to_string(),
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Some(file_name.span),
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None,
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Vec::new(),
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)
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})?;
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let file_value = Value::String {
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val: format!("saved {:?}", &file_name.item),
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span: file_name.span,
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};
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Ok(PipelineData::Value(
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Value::List {
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vals: vec![file_value],
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span: call.head,
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},
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None,
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))
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}
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