c

crates/polars-lazy/src/scan/ndjson.rs

@@ -3,6 +3,7 @@ use std::path::{Path, PathBuf};
 use std::sync::{Arc, Mutex, RwLock};
 
 use polars_core::prelude::*;
+use polars_io::cloud::CloudOptions;
 use polars_io::RowIndex;
 use polars_plan::plans::{DslPlan, FileScan};
 use polars_plan::prelude::{FileScanOptions, NDJsonReadOptions};
@@ -22,6 +23,7 @@ pub struct LazyJsonLineReader {
     pub(crate) n_rows: Option<usize>,
     pub(crate) ignore_errors: bool,
     pub(crate) include_file_paths: Option<Arc<str>>,
+    pub(crate) cloud_options: Option<CloudOptions>,
 }
 
 impl LazyJsonLineReader {
@@ -41,6 +43,7 @@ impl LazyJsonLineReader {
             ignore_errors: false,
             n_rows: None,
             include_file_paths: None,
+            cloud_options: None,
         }
     }
     /// Add a row index column.
@@ -92,6 +95,11 @@ impl LazyJsonLineReader {
         self
     }
 
+    pub fn with_cloud_options(mut self, cloud_options: Option<CloudOptions>) -> Self {
+        self.cloud_options = cloud_options;
+        self
+    }
+
     pub fn with_include_file_paths(mut self, include_file_paths: Option<Arc<str>>) -> Self {
         self.include_file_paths = include_file_paths;
         self
@@ -100,10 +108,6 @@ impl LazyJsonLineReader {
 
 impl LazyFileListReader for LazyJsonLineReader {
     fn finish(self) -> PolarsResult<LazyFrame> {
-        if !self.glob() {
-            return self.finish_no_glob();
-        }
-
         let paths = Arc::new(Mutex::new((self.paths, false)));
 
         let file_options = FileScanOptions {
@@ -127,7 +131,10 @@ impl LazyFileListReader for LazyJsonLineReader {
             schema: self.schema,
         };
 
-        let scan_type = FileScan::NDJson { options };
+        let scan_type = FileScan::NDJson {
+            options,
+            cloud_options: self.cloud_options,
+        };
 
         Ok(LazyFrame::from(DslPlan::Scan {
             paths,
@@ -140,39 +147,7 @@ impl LazyFileListReader for LazyJsonLineReader {
     }
 
     fn finish_no_glob(self) -> PolarsResult<LazyFrame> {
-        let paths = Arc::new(Mutex::new((self.paths, false)));
-
-        let file_options = FileScanOptions {
-            n_rows: self.n_rows,
-            with_columns: None,
-            cache: false,
-            row_index: self.row_index.clone(),
-            rechunk: self.rechunk,
-            file_counter: 0,
-            hive_options: Default::default(),
-            glob: false,
-            include_file_paths: None,
-        };
-
-        let options = NDJsonReadOptions {
-            n_threads: None,
-            infer_schema_length: self.infer_schema_length,
-            chunk_size: NonZeroUsize::new(1 << 18).unwrap(),
-            low_memory: self.low_memory,
-            ignore_errors: self.ignore_errors,
-            schema: self.schema,
-        };
-
-        let scan_type = FileScan::NDJson { options };
-
-        Ok(LazyFrame::from(DslPlan::Scan {
-            paths,
-            file_info: Arc::new(RwLock::new(None)),
-            hive_parts: None,
-            predicate: None,
-            file_options,
-            scan_type,
-        }))
+        unreachable!();
     }
 
     fn paths(&self) -> &[PathBuf] {
@@ -215,4 +190,9 @@ impl LazyFileListReader for LazyJsonLineReader {
     fn row_index(&self) -> Option<&RowIndex> {
         self.row_index.as_ref()
     }
+
+    /// [CloudOptions] used to list files.
+    fn cloud_options(&self) -> Option<&CloudOptions> {
+        self.cloud_options.as_ref()
+    }
 }

crates/polars-mem-engine/src/executors/scan/ndjson.rs

@@ -1,5 +1,6 @@
 use std::path::PathBuf;
 
+use polars_core::config;
 use polars_core::utils::accumulate_dataframes_vertical;
 
 use super::*;
@@ -38,6 +39,14 @@ impl JsonExec {
             .as_ref()
             .unwrap_right();
 
+        let verbose = config::verbose();
+        let force_async = config::force_async();
+        let run_async = force_async || is_cloud_url(self.paths.first().unwrap());
+
+        if force_async && verbose {
+            eprintln!("ASYNC READING FORCED");
+        }
+
         let mut n_rows = self.file_scan_options.n_rows;
 
         // Avoid panicking
@@ -60,9 +69,23 @@ impl JsonExec {
                     return None;
                 }
 
-                let reader = match JsonLineReader::from_path(p) {
-                    Ok(r) => r,
-                    Err(e) => return Some(Err(e)),
+                let reader = if run_async {
+                    JsonLineReader::new(
+                        match polars_io::file_cache::FILE_CACHE
+                            .get_entry(p.to_str().unwrap())
+                            // Safety: This was initialized by schema inference.
+                            .unwrap()
+                            .try_open_assume_latest()
+                        {
+                            Ok(v) => v,
+                            Err(e) => return Some(Err(e)),
+                        },
+                    )
+                } else {
+                    match JsonLineReader::from_path(p) {
+                        Ok(r) => r,
+                        Err(e) => return Some(Err(e)),
+                    }
                 };
 
                 let row_index = self.file_scan_options.row_index.as_mut();

crates/polars-mem-engine/src/planner/lp.rs

@@ -292,7 +292,7 @@ fn create_physical_plan_impl(
                     metadata,
                 ))),
                 #[cfg(feature = "json")]
-                FileScan::NDJson { options } => Ok(Box::new(executors::JsonExec::new(
+                FileScan::NDJson { options, .. } => Ok(Box::new(executors::JsonExec::new(
                     paths,
                     options,
                     file_options,

crates/polars-plan/src/plans/conversion/dsl_to_ir.rs

@@ -151,10 +151,16 @@ pub fn to_alp_impl(
                             .map_err(|e| e.context(failed_here!(csv scan)))?
                     },
                     #[cfg(feature = "json")]
-                    FileScan::NDJson { options } => {
-                        scans::ndjson_file_info(&paths, &file_options, options)
-                            .map_err(|e| e.context(failed_here!(ndjson scan)))?
-                    },
+                    FileScan::NDJson {
+                        options,
+                        cloud_options,
+                    } => scans::ndjson_file_info(
+                        &paths,
+                        &file_options,
+                        options,
+                        cloud_options.as_ref(),
+                    )
+                    .map_err(|e| e.context(failed_here!(ndjson scan)))?,
                     // FileInfo should be set.
                     FileScan::Anonymous { .. } => unreachable!(),
                 }
@@ -749,21 +755,23 @@ fn expand_scan_paths(
     }
 
     {
-        let paths_expanded = match scan_type {
+        let paths_expanded = match &scan_type {
             #[cfg(feature = "parquet")]
-            FileScan::Parquet {
-                ref cloud_options, ..
-            } => expand_scan_paths_with_hive_update(&lock.0, file_options, cloud_options)?,
+            FileScan::Parquet { cloud_options, .. } => {
+                expand_scan_paths_with_hive_update(&lock.0, file_options, cloud_options)?
+            },
             #[cfg(feature = "ipc")]
-            FileScan::Ipc {
-                ref cloud_options, ..
-            } => expand_scan_paths_with_hive_update(&lock.0, file_options, cloud_options)?,
+            FileScan::Ipc { cloud_options, .. } => {
+                expand_scan_paths_with_hive_update(&lock.0, file_options, cloud_options)?
+            },
             #[cfg(feature = "csv")]
-            FileScan::Csv {
-                ref cloud_options, ..
-            } => expand_paths(&lock.0, file_options.glob, cloud_options.as_ref())?,
+            FileScan::Csv { cloud_options, .. } => {
+                expand_paths(&lock.0, file_options.glob, cloud_options.as_ref())?
+            },
             #[cfg(feature = "json")]
-            FileScan::NDJson { .. } => expand_paths(&lock.0, file_options.glob, None)?,
+            FileScan::NDJson { cloud_options, .. } => {
+                expand_paths(&lock.0, file_options.glob, cloud_options.as_ref())?
+            },
             FileScan::Anonymous { .. } => unreachable!(), // Invariant: Anonymous scans are already expanded.
         };
 

crates/polars-plan/src/plans/conversion/scans.rs

@@ -9,7 +9,7 @@ use polars_io::RowIndex;
 
 use super::*;
 
-fn get_path(paths: &[PathBuf]) -> PolarsResult<&PathBuf> {
+fn get_first_path(paths: &[PathBuf]) -> PolarsResult<&PathBuf> {
     // Use first path to get schema.
     paths
         .first()
@@ -42,7 +42,7 @@ pub(super) fn parquet_file_info(
     file_options: &FileScanOptions,
     cloud_options: Option<&polars_io::cloud::CloudOptions>,
 ) -> PolarsResult<(FileInfo, Option<FileMetaDataRef>)> {
-    let path = get_path(paths)?;
+    let path = get_first_path(paths)?;
 
     let (schema, reader_schema, num_rows, metadata) = if is_cloud_url(path) {
         #[cfg(not(feature = "cloud"))]
@@ -92,7 +92,7 @@ pub(super) fn ipc_file_info(
     file_options: &FileScanOptions,
     cloud_options: Option<&polars_io::cloud::CloudOptions>,
 ) -> PolarsResult<(FileInfo, arrow::io::ipc::read::FileMetadata)> {
-    let path = get_path(paths)?;
+    let path = get_first_path(paths)?;
 
     let metadata = if is_cloud_url(path) {
         #[cfg(not(feature = "cloud"))]
@@ -145,7 +145,7 @@ pub(super) fn csv_file_info(
     // * See if we can do this without downloading the entire file
 
     // prints the error message if paths is empty.
-    let first_path = get_path(paths)?;
+    let first_path = get_first_path(paths)?;
     let run_async = is_cloud_url(first_path) || config::force_async();
 
     let cache_entries = {
@@ -177,7 +177,7 @@ pub(super) fn csv_file_info(
             #[cfg(feature = "cloud")]
             {
                 let entry: &Arc<polars_io::file_cache::FileCacheEntry> =
-                    cache_entries.as_ref().unwrap().get(i).unwrap();
+                    &cache_entries.as_ref().unwrap()[0];
                 entry.try_open_check_latest()?
             }
             #[cfg(not(feature = "cloud"))]
@@ -279,10 +279,50 @@ pub(super) fn ndjson_file_info(
     paths: &[PathBuf],
     file_options: &FileScanOptions,
     ndjson_options: &mut NDJsonReadOptions,
+    cloud_options: Option<&polars_io::cloud::CloudOptions>,
 ) -> PolarsResult<FileInfo> {
-    let path = get_path(paths)?;
+    use polars_core::config;
+
+    let run_async = !paths.is_empty() && is_cloud_url(&paths[0]) || config::force_async();
 
-    let f = polars_utils::open_file(path)?;
+    let cache_entries = {
+        #[cfg(feature = "cloud")]
+        {
+            if run_async {
+                Some(polars_io::file_cache::init_entries_from_uri_list(
+                    paths
+                        .iter()
+                        .map(|path| Arc::from(path.to_str().unwrap()))
+                        .collect::<Vec<_>>()
+                        .as_slice(),
+                    cloud_options,
+                )?)
+            } else {
+                None
+            }
+        }
+        #[cfg(not(feature = "cloud"))]
+        {
+            if run_async {
+                panic!("required feature `cloud` is not enabled")
+            }
+        }
+    };
+
+    let first_path = get_first_path(paths)?;
+
+    let f = if run_async {
+        #[cfg(feature = "cloud")]
+        {
+            cache_entries.unwrap()[0].try_open_check_latest()?
+        }
+        #[cfg(not(feature = "cloud"))]
+        {
+            panic!("required feature `cloud` is not enabled")
+        }
+    } else {
+        polars_utils::open_file(first_path)?
+    };
     let mut reader = std::io::BufReader::new(f);
 
     let (reader_schema, schema) = if let Some(schema) = ndjson_options.schema.take() {

crates/polars-plan/src/plans/file_scan.rs

@@ -34,7 +34,10 @@ pub enum FileScan {
         metadata: Option<arrow::io::ipc::read::FileMetadata>,
     },
     #[cfg(feature = "json")]
-    NDJson { options: NDJsonReadOptions },
+    NDJson {
+        options: NDJsonReadOptions,
+        cloud_options: Option<polars_io::cloud::CloudOptions>,
+    },
     #[cfg_attr(feature = "serde", serde(skip))]
     Anonymous {
         options: Arc<AnonymousScanOptions>,
@@ -83,7 +86,16 @@ impl PartialEq for FileScan {
                 },
             ) => l == r && c_l == c_r,
             #[cfg(feature = "json")]
-            (FileScan::NDJson { options: l }, FileScan::NDJson { options: r }) => l == r,
+            (
+                FileScan::NDJson {
+                    options: l,
+                    cloud_options: c_l,
+                },
+                FileScan::NDJson {
+                    options: r,
+                    cloud_options: c_r,
+                },
+            ) => l == r && c_l == c_r,
             _ => false,
         }
     }
@@ -122,7 +134,13 @@ impl Hash for FileScan {
                 cloud_options.hash(state);
             },
             #[cfg(feature = "json")]
-            FileScan::NDJson { options } => options.hash(state),
+            FileScan::NDJson {
+                options,
+                cloud_options,
+            } => {
+                options.hash(state);
+                cloud_options.hash(state)
+            },
             FileScan::Anonymous { options, .. } => options.hash(state),
         }
     }