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use std::path::Path;
use polars_core::prelude::*;
use polars_io::RowCount;
use crate::prelude::*;
#[derive(Clone)]
pub struct ScanArgsIpc {
pub n_rows: Option<usize>,
pub cache: bool,
pub rechunk: bool,
pub row_count: Option<RowCount>,
pub memmap: bool,
}
impl Default for ScanArgsIpc {
fn default() -> Self {
Self {
n_rows: None,
cache: true,
rechunk: true,
row_count: None,
memmap: true,
}
}
}
impl LazyFrame {
fn scan_ipc_impl(path: impl AsRef<Path>, args: ScanArgsIpc) -> PolarsResult<Self> {
let options = IpcScanOptions {
n_rows: args.n_rows,
cache: args.cache,
with_columns: None,
row_count: None,
rechunk: args.rechunk,
memmap: args.memmap,
};
let row_count = args.row_count;
let mut lf: LazyFrame = LogicalPlanBuilder::scan_ipc(path.as_ref(), options)?
.build()
.into();
lf.opt_state.file_caching = true;
if let Some(row_count) = row_count {
lf = lf.with_row_count(&row_count.name, Some(row_count.offset))
}
Ok(lf)
}
#[cfg_attr(docsrs, doc(cfg(feature = "ipc")))]
pub fn scan_ipc(path: impl AsRef<Path>, args: ScanArgsIpc) -> PolarsResult<Self> {
let path = path.as_ref();
let path_str = path.to_string_lossy();
if path_str.contains('*') {
let paths = glob::glob(&path_str)
.map_err(|_| PolarsError::ComputeError("invalid glob pattern given".into()))?;
let lfs = paths
.map(|r| {
let path = r.map_err(|e| PolarsError::ComputeError(format!("{}", e).into()))?;
let mut args = args.clone();
args.row_count = None;
Self::scan_ipc_impl(path, args)
})
.collect::<PolarsResult<Vec<_>>>()?;
concat(&lfs, args.rechunk, true)
.map_err(|_| PolarsError::ComputeError("no matching files found".into()))
.map(|mut lf| {
if let Some(n_rows) = args.n_rows {
lf = lf.slice(0, n_rows as IdxSize);
};
if let Some(rc) = args.row_count {
lf = lf.with_row_count(&rc.name, Some(rc.offset))
}
lf
})
} else {
Self::scan_ipc_impl(path, args)
}
}
}