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Fix skiprows issue with ORC Reader #7359

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merged 5 commits into from
Feb 15, 2021
Merged

Fix skiprows issue with ORC Reader #7359

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7fe82e9
Chages to skipcount calculation
rgsl888prabhu Feb 9, 2021
bb4a77c
review changes
rgsl888prabhu Feb 9, 2021
706e008
simplifying changes
rgsl888prabhu Feb 10, 2021
70641c6
review changes to remove __brev
rgsl888prabhu Feb 10, 2021
92e3e0c
review changes to move comment
rgsl888prabhu Feb 11, 2021
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5 changes: 3 additions & 2 deletions cpp/src/io/orc/stripe_data.cu
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Original file line number Diff line number Diff line change
Expand Up @@ -1211,8 +1211,9 @@ __global__ void __launch_bounds__(block_size)
uint32_t skippedrows = min(static_cast<uint32_t>(first_row - row_in), nrows);
uint32_t skip_count = 0;
for (uint32_t i = t * 32; i < skippedrows; i += 32 * 32) {
uint32_t bits = s->vals.u32[i >> 5];
if (i + 32 > skippedrows) { bits &= (1 << (skippedrows - i)) - 1; }
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uint32_t bits = (i + 32 <= skippedrows)
? s->vals.u32[i >> 5]
: (rle8_read_bool32(s->vals.u32, i) & ((1 << (skippedrows - i)) - 1));
skip_count += __popc(bits);
}
skip_count = warp_reduce(temp_storage[t / 32]).Sum(skip_count);
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26 changes: 26 additions & 0 deletions python/cudf/cudf/tests/test_orc.py
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Expand Up @@ -8,6 +8,7 @@
import pandas as pd
import pyarrow as pa
import pyarrow.orc
import pyorc
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CI fails because of this import

ModuleNotFoundError: No module named 'pyorc'

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Created a PR for it rapidsai/integration#215

import pytest

import cudf
Expand Down Expand Up @@ -318,6 +319,31 @@ def test_orc_read_rows(datadir, skiprows, num_rows):
np.testing.assert_allclose(pdf, gdf)


def test_orc_read_skiprows(tmpdir):
fname = tmpdir.join("TestOrcFile.skiprows.orc")
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df = pd.DataFrame(
{"a": [1, 0, 1, 0, None, 1, 1, 1, 0, None, 0, 0, 1, 1, 1, 1]},
dtype=pd.BooleanDtype(),
)
output = open(fname, "wb")
writer = pyorc.Writer(output, pyorc.Struct(a=pyorc.Boolean()))
tuples = list(
map(
lambda x: (None,) if x[0] is pd.NA else x,
list(df.itertuples(index=False, name=None)),
)
)
writer.writerows(tuples)
writer.close()

skiprows = 10

expected = cudf.read_orc(fname)[skiprows::].reset_index(drop=True)
got = cudf.read_orc(fname, skiprows=skiprows)

assert_eq(expected, got)


def test_orc_reader_uncompressed_block(datadir):
path = datadir / "uncompressed_snappy.orc"
try:
Expand Down