1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147

use std::path::{Path, PathBuf};

use polars_core::prelude::*;
use polars_io::cloud::CloudOptions;
use polars_io::ipc::IpcScanOptions;
use polars_io::RowIndex;

use crate::prelude::*;

#[derive(Clone)]
pub struct ScanArgsIpc {
    pub n_rows: Option<usize>,
    pub cache: bool,
    pub rechunk: bool,
    pub row_index: Option<RowIndex>,
    pub memory_map: bool,
    pub cloud_options: Option<CloudOptions>,
}

impl Default for ScanArgsIpc {
    fn default() -> Self {
        Self {
            n_rows: None,
            cache: true,
            rechunk: false,
            row_index: None,
            memory_map: true,
            cloud_options: Default::default(),
        }
    }
}

#[derive(Clone)]
struct LazyIpcReader {
    args: ScanArgsIpc,
    path: PathBuf,
    paths: Arc<[PathBuf]>,
}

impl LazyIpcReader {
    fn new(path: PathBuf, args: ScanArgsIpc) -> Self {
        Self {
            args,
            path,
            paths: Arc::new([]),
        }
    }
}

impl LazyFileListReader for LazyIpcReader {
    fn finish(mut self) -> PolarsResult<LazyFrame> {
        if let Some(paths) = self.iter_paths()? {
            let paths = paths
                .into_iter()
                .collect::<PolarsResult<Arc<[PathBuf]>>>()?;
            self.paths = paths;
        }
        self.finish_no_glob()
    }

    fn finish_no_glob(self) -> PolarsResult<LazyFrame> {
        let args = self.args;

        let paths = if self.paths.is_empty() {
            Arc::new([self.path]) as Arc<[PathBuf]>
        } else {
            self.paths
        };

        let options = IpcScanOptions {
            memory_map: args.memory_map,
        };

        let mut lf: LazyFrame = DslBuilder::scan_ipc(
            paths,
            options,
            args.n_rows,
            args.cache,
            args.row_index,
            args.rechunk,
            args.cloud_options,
        )?
        .build()
        .into();
        lf.opt_state.file_caching = true;

        Ok(lf)
    }

    fn path(&self) -> &Path {
        self.path.as_path()
    }

    fn paths(&self) -> &[PathBuf] {
        &self.paths
    }

    fn with_path(mut self, path: PathBuf) -> Self {
        self.path = path;
        self
    }

    fn with_paths(mut self, paths: Arc<[PathBuf]>) -> Self {
        self.paths = paths;
        self
    }

    fn with_n_rows(mut self, n_rows: impl Into<Option<usize>>) -> Self {
        self.args.n_rows = n_rows.into();
        self
    }

    fn with_row_index(mut self, row_index: impl Into<Option<RowIndex>>) -> Self {
        self.args.row_index = row_index.into();
        self
    }

    fn rechunk(&self) -> bool {
        self.args.rechunk
    }

    fn with_rechunk(mut self, toggle: bool) -> Self {
        self.args.rechunk = toggle;
        self
    }

    fn n_rows(&self) -> Option<usize> {
        self.args.n_rows
    }

    fn row_index(&self) -> Option<&RowIndex> {
        self.args.row_index.as_ref()
    }
}

impl LazyFrame {
    /// Create a LazyFrame directly from a ipc scan.
    pub fn scan_ipc(path: impl AsRef<Path>, args: ScanArgsIpc) -> PolarsResult<Self> {
        LazyIpcReader::new(path.as_ref().to_owned(), args).finish()
    }

    pub fn scan_ipc_files(paths: Arc<[PathBuf]>, args: ScanArgsIpc) -> PolarsResult<Self> {
        LazyIpcReader::new(PathBuf::new(), args)
            .with_paths(paths)
            .finish()
    }
}