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test_cloud_fetch_queue.py
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try:
import pyarrow
except ImportError:
pyarrow = None
import unittest
import pytest
from unittest.mock import MagicMock, patch
from databricks.sql.thrift_api.TCLIService.ttypes import TSparkArrowResultLink
import databricks.sql.utils as utils
from databricks.sql.types import SSLOptions
@pytest.mark.skipif(pyarrow is None, reason="PyArrow is not installed")
class CloudFetchQueueSuite(unittest.TestCase):
def create_result_link(
self,
file_link: str = "fileLink",
start_row_offset: int = 0,
row_count: int = 8000,
bytes_num: int = 20971520,
):
return TSparkArrowResultLink(
file_link, None, start_row_offset, row_count, bytes_num
)
def create_result_links(self, num_files: int, start_row_offset: int = 0):
result_links = []
for i in range(num_files):
file_link = "fileLink_" + str(i)
result_link = self.create_result_link(
file_link=file_link, start_row_offset=start_row_offset
)
result_links.append(result_link)
start_row_offset += result_link.rowCount
return result_links
@staticmethod
def make_arrow_table():
batch = [[0, 1, 2], [3, 4, 5], [6, 7, 8], [9, 10, 11]]
n_cols = len(batch[0]) if batch else 0
schema = pyarrow.schema({"col%s" % i: pyarrow.uint32() for i in range(n_cols)})
cols = [[batch[row][col] for row in range(len(batch))] for col in range(n_cols)]
return pyarrow.Table.from_pydict(dict(zip(schema.names, cols)), schema=schema)
@staticmethod
def get_schema_bytes():
schema = pyarrow.schema({"col%s" % i: pyarrow.uint32() for i in range(4)})
sink = pyarrow.BufferOutputStream()
writer = pyarrow.ipc.RecordBatchStreamWriter(sink, schema)
writer.close()
return sink.getvalue().to_pybytes()
@patch(
"databricks.sql.utils.CloudFetchQueue._create_next_table",
return_value=[None, None],
)
def test_initializer_adds_links(self, mock_create_next_table):
schema_bytes = MagicMock()
result_links = self.create_result_links(10)
queue = utils.CloudFetchQueue(
schema_bytes,
result_links=result_links,
max_download_threads=10,
ssl_options=SSLOptions(),
)
assert len(queue.download_manager._pending_links) == 10
assert len(queue.download_manager._download_tasks) == 0
mock_create_next_table.assert_called()
def test_initializer_no_links_to_add(self):
schema_bytes = MagicMock()
result_links = []
queue = utils.CloudFetchQueue(
schema_bytes,
result_links=result_links,
max_download_threads=10,
ssl_options=SSLOptions(),
)
assert len(queue.download_manager._pending_links) == 0
assert len(queue.download_manager._download_tasks) == 0
assert queue.table is None
@patch(
"databricks.sql.cloudfetch.download_manager.ResultFileDownloadManager.get_next_downloaded_file",
return_value=None,
)
def test_create_next_table_no_download(self, mock_get_next_downloaded_file):
queue = utils.CloudFetchQueue(
MagicMock(),
result_links=[],
max_download_threads=10,
ssl_options=SSLOptions(),
)
assert queue._create_next_table() is None
mock_get_next_downloaded_file.assert_called_with(0)
@patch("databricks.sql.utils.create_arrow_table_from_arrow_file")
@patch(
"databricks.sql.cloudfetch.download_manager.ResultFileDownloadManager.get_next_downloaded_file",
return_value=MagicMock(file_bytes=b"1234567890", row_count=4),
)
def test_initializer_create_next_table_success(
self, mock_get_next_downloaded_file, mock_create_arrow_table
):
mock_create_arrow_table.return_value = self.make_arrow_table()
schema_bytes, description = MagicMock(), MagicMock()
queue = utils.CloudFetchQueue(
schema_bytes,
result_links=[],
description=description,
max_download_threads=10,
ssl_options=SSLOptions(),
)
expected_result = self.make_arrow_table()
mock_get_next_downloaded_file.assert_called_with(0)
mock_create_arrow_table.assert_called_with(b"1234567890", description)
assert queue.table == expected_result
assert queue.table.num_rows == 4
assert queue.table_row_index == 0
assert queue.start_row_index == 4
table = queue._create_next_table()
assert table == expected_result
assert table.num_rows == 4
assert queue.start_row_index == 8
@patch("databricks.sql.utils.CloudFetchQueue._create_next_table")
def test_next_n_rows_0_rows(self, mock_create_next_table):
mock_create_next_table.return_value = self.make_arrow_table()
schema_bytes, description = MagicMock(), MagicMock()
queue = utils.CloudFetchQueue(
schema_bytes,
result_links=[],
description=description,
max_download_threads=10,
ssl_options=SSLOptions(),
)
assert queue.table == self.make_arrow_table()
assert queue.table.num_rows == 4
assert queue.table_row_index == 0
result = queue.next_n_rows(0)
assert result.num_rows == 0
assert queue.table_row_index == 0
assert result == self.make_arrow_table()[0:0]
@patch("databricks.sql.utils.CloudFetchQueue._create_next_table")
def test_next_n_rows_partial_table(self, mock_create_next_table):
mock_create_next_table.return_value = self.make_arrow_table()
schema_bytes, description = MagicMock(), MagicMock()
queue = utils.CloudFetchQueue(
schema_bytes,
result_links=[],
description=description,
max_download_threads=10,
ssl_options=SSLOptions(),
)
assert queue.table == self.make_arrow_table()
assert queue.table.num_rows == 4
assert queue.table_row_index == 0
result = queue.next_n_rows(3)
assert result.num_rows == 3
assert queue.table_row_index == 3
assert result == self.make_arrow_table()[:3]
@patch("databricks.sql.utils.CloudFetchQueue._create_next_table")
def test_next_n_rows_more_than_one_table(self, mock_create_next_table):
mock_create_next_table.return_value = self.make_arrow_table()
schema_bytes, description = MagicMock(), MagicMock()
queue = utils.CloudFetchQueue(
schema_bytes,
result_links=[],
description=description,
max_download_threads=10,
ssl_options=SSLOptions(),
)
assert queue.table == self.make_arrow_table()
assert queue.table.num_rows == 4
assert queue.table_row_index == 0
result = queue.next_n_rows(7)
assert result.num_rows == 7
assert queue.table_row_index == 3
assert (
result
== pyarrow.concat_tables(
[self.make_arrow_table(), self.make_arrow_table()]
)[:7]
)
@patch("databricks.sql.utils.CloudFetchQueue._create_next_table")
def test_next_n_rows_only_one_table_returned(self, mock_create_next_table):
mock_create_next_table.side_effect = [self.make_arrow_table(), None]
schema_bytes, description = MagicMock(), MagicMock()
queue = utils.CloudFetchQueue(
schema_bytes,
result_links=[],
description=description,
max_download_threads=10,
ssl_options=SSLOptions(),
)
assert queue.table == self.make_arrow_table()
assert queue.table.num_rows == 4
assert queue.table_row_index == 0
result = queue.next_n_rows(7)
assert result.num_rows == 4
assert result == self.make_arrow_table()
@patch("databricks.sql.utils.CloudFetchQueue._create_next_table", return_value=None)
def test_next_n_rows_empty_table(self, mock_create_next_table):
schema_bytes = self.get_schema_bytes()
description = MagicMock()
queue = utils.CloudFetchQueue(
schema_bytes,
result_links=[],
description=description,
max_download_threads=10,
ssl_options=SSLOptions(),
)
assert queue.table is None
result = queue.next_n_rows(100)
mock_create_next_table.assert_called()
assert result == pyarrow.ipc.open_stream(bytearray(schema_bytes)).read_all()
@patch("databricks.sql.utils.CloudFetchQueue._create_next_table")
def test_remaining_rows_empty_table_fully_returned(self, mock_create_next_table):
mock_create_next_table.side_effect = [self.make_arrow_table(), None, 0]
schema_bytes, description = MagicMock(), MagicMock()
queue = utils.CloudFetchQueue(
schema_bytes,
result_links=[],
description=description,
max_download_threads=10,
ssl_options=SSLOptions(),
)
assert queue.table == self.make_arrow_table()
assert queue.table.num_rows == 4
queue.table_row_index = 4
result = queue.remaining_rows()
assert result.num_rows == 0
assert result == self.make_arrow_table()[0:0]
@patch("databricks.sql.utils.CloudFetchQueue._create_next_table")
def test_remaining_rows_partial_table_fully_returned(self, mock_create_next_table):
mock_create_next_table.side_effect = [self.make_arrow_table(), None]
schema_bytes, description = MagicMock(), MagicMock()
queue = utils.CloudFetchQueue(
schema_bytes,
result_links=[],
description=description,
max_download_threads=10,
ssl_options=SSLOptions(),
)
assert queue.table == self.make_arrow_table()
assert queue.table.num_rows == 4
queue.table_row_index = 2
result = queue.remaining_rows()
assert result.num_rows == 2
assert result == self.make_arrow_table()[2:]
@patch("databricks.sql.utils.CloudFetchQueue._create_next_table")
def test_remaining_rows_one_table_fully_returned(self, mock_create_next_table):
mock_create_next_table.side_effect = [self.make_arrow_table(), None]
schema_bytes, description = MagicMock(), MagicMock()
queue = utils.CloudFetchQueue(
schema_bytes,
result_links=[],
description=description,
max_download_threads=10,
ssl_options=SSLOptions(),
)
assert queue.table == self.make_arrow_table()
assert queue.table.num_rows == 4
assert queue.table_row_index == 0
result = queue.remaining_rows()
assert result.num_rows == 4
assert result == self.make_arrow_table()
@patch("databricks.sql.utils.CloudFetchQueue._create_next_table")
def test_remaining_rows_multiple_tables_fully_returned(
self, mock_create_next_table
):
mock_create_next_table.side_effect = [
self.make_arrow_table(),
self.make_arrow_table(),
None,
]
schema_bytes, description = MagicMock(), MagicMock()
queue = utils.CloudFetchQueue(
schema_bytes,
result_links=[],
description=description,
max_download_threads=10,
ssl_options=SSLOptions(),
)
assert queue.table == self.make_arrow_table()
assert queue.table.num_rows == 4
queue.table_row_index = 3
result = queue.remaining_rows()
assert mock_create_next_table.call_count == 3
assert result.num_rows == 5
assert (
result
== pyarrow.concat_tables(
[self.make_arrow_table(), self.make_arrow_table()]
)[3:]
)
@patch("databricks.sql.utils.CloudFetchQueue._create_next_table", return_value=None)
def test_remaining_rows_empty_table(self, mock_create_next_table):
schema_bytes = self.get_schema_bytes()
description = MagicMock()
queue = utils.CloudFetchQueue(
schema_bytes,
result_links=[],
description=description,
max_download_threads=10,
ssl_options=SSLOptions(),
)
assert queue.table is None
result = queue.remaining_rows()
assert result == pyarrow.ipc.open_stream(bytearray(schema_bytes)).read_all()