pub struct BloomFilterCreator {
rows_per_segment: usize,
accumulated_row_count: usize,
cur_seg_distinct_elems: HashSet<Bytes>,
cur_seg_distinct_elems_mem_usage: usize,
finalized_bloom_filters: FinalizedBloomFilterStorage,
finalized_row_count: usize,
global_memory_usage: Arc<AtomicUsize>,
}
Expand description
BloomFilterCreator
is responsible for creating and managing bloom filters
for a set of elements. It divides the rows into segments and creates
bloom filters for each segment.
§Format
The bloom filter creator writes the following format to the writer:
+--------------------+--------------------+-----+----------------------+----------------------+
| Bloom filter 0 | Bloom filter 1 | ... | BloomFilterMeta | Meta size |
+--------------------+--------------------+-----+----------------------+----------------------+
|<- bytes (size 0) ->|<- bytes (size 1) ->| ... |<- json (meta size) ->|<- u32 LE (4 bytes) ->|
Fields§
§rows_per_segment: usize
The number of rows per segment set by the user.
accumulated_row_count: usize
Row count that added to the bloom filter so far.
cur_seg_distinct_elems: HashSet<Bytes>
A set of distinct elements in the current segment.
cur_seg_distinct_elems_mem_usage: usize
The memory usage of the current segment’s distinct elements.
finalized_bloom_filters: FinalizedBloomFilterStorage
Storage for finalized Bloom filters.
finalized_row_count: usize
Row count that finalized so far.
global_memory_usage: Arc<AtomicUsize>
Global memory usage of the bloom filter creator.
Implementations§
Source§impl BloomFilterCreator
impl BloomFilterCreator
Sourcepub fn new(
rows_per_segment: usize,
intermediate_provider: Arc<dyn ExternalTempFileProvider>,
global_memory_usage: Arc<AtomicUsize>,
global_memory_usage_threshold: Option<usize>,
) -> Self
pub fn new( rows_per_segment: usize, intermediate_provider: Arc<dyn ExternalTempFileProvider>, global_memory_usage: Arc<AtomicUsize>, global_memory_usage_threshold: Option<usize>, ) -> Self
Creates a new BloomFilterCreator
with the specified number of rows per segment.
§PANICS
rows_per_segment
<= 0
Sourcepub async fn push_n_row_elems(
&mut self,
nrows: usize,
elems: impl IntoIterator<Item = Bytes>,
) -> Result<()>
pub async fn push_n_row_elems( &mut self, nrows: usize, elems: impl IntoIterator<Item = Bytes>, ) -> Result<()>
Adds multiple rows of elements to the bloom filter. If the number of accumulated rows
reaches rows_per_segment
, it finalizes the current segment.
Sourcepub async fn push_row_elems(
&mut self,
elems: impl IntoIterator<Item = Bytes>,
) -> Result<()>
pub async fn push_row_elems( &mut self, elems: impl IntoIterator<Item = Bytes>, ) -> Result<()>
Adds a row of elements to the bloom filter. If the number of accumulated rows
reaches rows_per_segment
, it finalizes the current segment.
Sourcepub async fn finish(&mut self, writer: impl AsyncWrite + Unpin) -> Result<()>
pub async fn finish(&mut self, writer: impl AsyncWrite + Unpin) -> Result<()>
Finalizes any remaining segments and writes the bloom filters and metadata to the provided writer.
Sourcepub fn memory_usage(&self) -> usize
pub fn memory_usage(&self) -> usize
Returns the memory usage of the creating bloom filter.
async fn finalize_segment(&mut self) -> Result<()>
Trait Implementations§
Auto Trait Implementations§
impl Freeze for BloomFilterCreator
impl !RefUnwindSafe for BloomFilterCreator
impl Send for BloomFilterCreator
impl Sync for BloomFilterCreator
impl Unpin for BloomFilterCreator
impl !UnwindSafe for BloomFilterCreator
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