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| </pre></div><pre class="rust"><code><span class="comment">// Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you under the Apache License, Version 2.0 (the |
| // "License"); you may not use this file except in compliance |
| // with the License. You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, |
| // software distributed under the License is distributed on an |
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| // KIND, either express or implied. See the License for the |
| // specific language governing permissions and limitations |
| // under the License. |
| |
| </span><span class="kw">use </span>bytes::Bytes; |
| <span class="kw">use </span>half::f16; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::basic::{ConvertedType, Encoding, LogicalType, Type}; |
| <span class="kw">use </span><span class="kw">crate</span>::bloom_filter::Sbbf; |
| <span class="kw">use </span><span class="kw">crate</span>::column::writer::{ |
| compare_greater, fallback_encoding, has_dictionary_support, is_nan, update_max, update_min, |
| }; |
| <span class="kw">use </span><span class="kw">crate</span>::data_type::private::ParquetValueType; |
| <span class="kw">use </span><span class="kw">crate</span>::data_type::DataType; |
| <span class="kw">use </span><span class="kw">crate</span>::encodings::encoding::{get_encoder, DictEncoder, Encoder}; |
| <span class="kw">use </span><span class="kw">crate</span>::errors::{ParquetError, <span class="prelude-ty">Result</span>}; |
| <span class="kw">use </span><span class="kw">crate</span>::file::properties::{EnabledStatistics, WriterProperties}; |
| <span class="kw">use </span><span class="kw">crate</span>::schema::types::{ColumnDescPtr, ColumnDescriptor}; |
| |
| <span class="doccomment">/// A collection of [`ParquetValueType`] encoded by a [`ColumnValueEncoder`] |
| </span><span class="kw">pub trait </span>ColumnValues { |
| <span class="doccomment">/// The number of values in this collection |
| </span><span class="kw">fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize; |
| } |
| |
| <span class="attr">#[cfg(feature = <span class="string">"arrow"</span>)] |
| </span><span class="kw">impl </span>ColumnValues <span class="kw">for dyn </span>arrow_array::Array { |
| <span class="kw">fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| arrow_array::Array::len(<span class="self">self</span>) |
| } |
| } |
| |
| <span class="kw">impl</span><T: ParquetValueType> ColumnValues <span class="kw">for </span>[T] { |
| <span class="kw">fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.len() |
| } |
| } |
| |
| <span class="doccomment">/// The encoded data for a dictionary page |
| </span><span class="kw">pub struct </span>DictionaryPage { |
| <span class="kw">pub </span>buf: Bytes, |
| <span class="kw">pub </span>num_values: usize, |
| <span class="kw">pub </span>is_sorted: bool, |
| } |
| |
| <span class="doccomment">/// The encoded values for a data page, with optional statistics |
| </span><span class="kw">pub struct </span>DataPageValues<T> { |
| <span class="kw">pub </span>buf: Bytes, |
| <span class="kw">pub </span>num_values: usize, |
| <span class="kw">pub </span>encoding: Encoding, |
| <span class="kw">pub </span>min_value: <span class="prelude-ty">Option</span><T>, |
| <span class="kw">pub </span>max_value: <span class="prelude-ty">Option</span><T>, |
| } |
| |
| <span class="doccomment">/// A generic encoder of [`ColumnValues`] to data and dictionary pages used by |
| /// [super::GenericColumnWriter`] |
| </span><span class="kw">pub trait </span>ColumnValueEncoder { |
| <span class="doccomment">/// The underlying value type of [`Self::Values`] |
| /// |
| /// Note: this avoids needing to fully qualify `<Self::Values as ColumnValues>::T` |
| </span><span class="kw">type </span>T: ParquetValueType; |
| |
| <span class="doccomment">/// The values encoded by this encoder |
| </span><span class="kw">type </span>Values: ColumnValues + <span class="question-mark">?</span>Sized; |
| |
| <span class="doccomment">/// Create a new [`ColumnValueEncoder`] |
| </span><span class="kw">fn </span>try_new(descr: <span class="kw-2">&</span>ColumnDescPtr, props: <span class="kw-2">&</span>WriterProperties) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Sized; |
| |
| <span class="doccomment">/// Write the corresponding values to this [`ColumnValueEncoder`] |
| </span><span class="kw">fn </span>write(<span class="kw-2">&mut </span><span class="self">self</span>, values: <span class="kw-2">&</span><span class="self">Self</span>::Values, offset: usize, len: usize) -> <span class="prelude-ty">Result</span><()>; |
| |
| <span class="doccomment">/// Write the values at the indexes in `indices` to this [`ColumnValueEncoder`] |
| </span><span class="kw">fn </span>write_gather(<span class="kw-2">&mut </span><span class="self">self</span>, values: <span class="kw-2">&</span><span class="self">Self</span>::Values, indices: <span class="kw-2">&</span>[usize]) -> <span class="prelude-ty">Result</span><()>; |
| |
| <span class="doccomment">/// Returns the number of buffered values |
| </span><span class="kw">fn </span>num_values(<span class="kw-2">&</span><span class="self">self</span>) -> usize; |
| |
| <span class="doccomment">/// Returns true if this encoder has a dictionary page |
| </span><span class="kw">fn </span>has_dictionary(<span class="kw-2">&</span><span class="self">self</span>) -> bool; |
| |
| <span class="doccomment">/// Returns an estimate of the dictionary page size in bytes, or `None` if no dictionary |
| </span><span class="kw">fn </span>estimated_dict_page_size(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><usize>; |
| |
| <span class="doccomment">/// Returns an estimate of the data page size in bytes |
| </span><span class="kw">fn </span>estimated_data_page_size(<span class="kw-2">&</span><span class="self">self</span>) -> usize; |
| |
| <span class="doccomment">/// Flush the dictionary page for this column chunk if any. Any subsequent calls to |
| /// [`Self::write`] will not be dictionary encoded |
| /// |
| /// Note: [`Self::flush_data_page`] must be called first, as this will error if there |
| /// are any pending page values |
| </span><span class="kw">fn </span>flush_dict_page(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><DictionaryPage>>; |
| |
| <span class="doccomment">/// Flush the next data page for this column chunk |
| </span><span class="kw">fn </span>flush_data_page(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><DataPageValues<<span class="self">Self</span>::T>>; |
| |
| <span class="doccomment">/// Flushes bloom filter if enabled and returns it, otherwise returns `None`. Subsequent writes |
| /// will *not* be tracked by the bloom filter as it is empty since. This should be called once |
| /// near the end of encoding. |
| </span><span class="kw">fn </span>flush_bloom_filter(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><Sbbf>; |
| } |
| |
| <span class="kw">pub struct </span>ColumnValueEncoderImpl<T: DataType> { |
| encoder: Box<<span class="kw">dyn </span>Encoder<T>>, |
| dict_encoder: <span class="prelude-ty">Option</span><DictEncoder<T>>, |
| descr: ColumnDescPtr, |
| num_values: usize, |
| statistics_enabled: EnabledStatistics, |
| min_value: <span class="prelude-ty">Option</span><T::T>, |
| max_value: <span class="prelude-ty">Option</span><T::T>, |
| bloom_filter: <span class="prelude-ty">Option</span><Sbbf>, |
| } |
| |
| <span class="kw">impl</span><T: DataType> ColumnValueEncoderImpl<T> { |
| <span class="kw">fn </span>min_max(<span class="kw-2">&</span><span class="self">self</span>, values: <span class="kw-2">&</span>[T::T], value_indices: <span class="prelude-ty">Option</span><<span class="kw-2">&</span>[usize]>) -> <span class="prelude-ty">Option</span><(T::T, T::T)> { |
| <span class="kw">match </span>value_indices { |
| <span class="prelude-val">Some</span>(indices) => get_min_max(<span class="kw-2">&</span><span class="self">self</span>.descr, indices.iter().map(|x| <span class="kw-2">&</span>values[<span class="kw-2">*</span>x])), |
| <span class="prelude-val">None </span>=> get_min_max(<span class="kw-2">&</span><span class="self">self</span>.descr, values.iter()), |
| } |
| } |
| |
| <span class="kw">fn </span>write_slice(<span class="kw-2">&mut </span><span class="self">self</span>, slice: <span class="kw-2">&</span>[T::T]) -> <span class="prelude-ty">Result</span><()> { |
| <span class="kw">if </span><span class="self">self</span>.statistics_enabled != EnabledStatistics::None |
| <span class="comment">// INTERVAL has undefined sort order, so don't write min/max stats for it |
| </span>&& <span class="self">self</span>.descr.converted_type() != ConvertedType::INTERVAL |
| { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>((min, max)) = <span class="self">self</span>.min_max(slice, <span class="prelude-val">None</span>) { |
| update_min(<span class="kw-2">&</span><span class="self">self</span>.descr, <span class="kw-2">&</span>min, <span class="kw-2">&mut </span><span class="self">self</span>.min_value); |
| update_max(<span class="kw-2">&</span><span class="self">self</span>.descr, <span class="kw-2">&</span>max, <span class="kw-2">&mut </span><span class="self">self</span>.max_value); |
| } |
| } |
| |
| <span class="comment">// encode the values into bloom filter if enabled |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(bloom_filter) = <span class="kw-2">&mut </span><span class="self">self</span>.bloom_filter { |
| <span class="kw">for </span>value <span class="kw">in </span>slice { |
| bloom_filter.insert(value); |
| } |
| } |
| |
| <span class="kw">match </span><span class="kw-2">&mut </span><span class="self">self</span>.dict_encoder { |
| <span class="prelude-val">Some</span>(encoder) => encoder.put(slice), |
| <span class="kw">_ </span>=> <span class="self">self</span>.encoder.put(slice), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><T: DataType> ColumnValueEncoder <span class="kw">for </span>ColumnValueEncoderImpl<T> { |
| <span class="kw">type </span>T = T::T; |
| |
| <span class="kw">type </span>Values = [T::T]; |
| |
| <span class="kw">fn </span>flush_bloom_filter(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><Sbbf> { |
| <span class="self">self</span>.bloom_filter.take() |
| } |
| |
| <span class="kw">fn </span>try_new(descr: <span class="kw-2">&</span>ColumnDescPtr, props: <span class="kw-2">&</span>WriterProperties) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="kw">let </span>dict_supported = props.dictionary_enabled(descr.path()) |
| && has_dictionary_support(T::get_physical_type(), props); |
| <span class="kw">let </span>dict_encoder = dict_supported.then(|| DictEncoder::new(descr.clone())); |
| |
| <span class="comment">// Set either main encoder or fallback encoder. |
| </span><span class="kw">let </span>encoder = get_encoder( |
| props |
| .encoding(descr.path()) |
| .unwrap_or_else(|| fallback_encoding(T::get_physical_type(), props)), |
| )<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span>statistics_enabled = props.statistics_enabled(descr.path()); |
| |
| <span class="kw">let </span>bloom_filter = props |
| .bloom_filter_properties(descr.path()) |
| .map(|props| Sbbf::new_with_ndv_fpp(props.ndv, props.fpp)) |
| .transpose()<span class="question-mark">?</span>; |
| |
| <span class="prelude-val">Ok</span>(<span class="self">Self </span>{ |
| encoder, |
| dict_encoder, |
| descr: descr.clone(), |
| num_values: <span class="number">0</span>, |
| statistics_enabled, |
| bloom_filter, |
| min_value: <span class="prelude-val">None</span>, |
| max_value: <span class="prelude-val">None</span>, |
| }) |
| } |
| |
| <span class="kw">fn </span>write(<span class="kw-2">&mut </span><span class="self">self</span>, values: <span class="kw-2">&</span>[T::T], offset: usize, len: usize) -> <span class="prelude-ty">Result</span><()> { |
| <span class="self">self</span>.num_values += len; |
| |
| <span class="kw">let </span>slice = values.get(offset..offset + len).ok_or_else(|| { |
| <span class="macro">general_err!</span>( |
| <span class="string">"Expected to write {} values, but have only {}"</span>, |
| len, |
| values.len() - offset |
| ) |
| })<span class="question-mark">?</span>; |
| |
| <span class="self">self</span>.write_slice(slice) |
| } |
| |
| <span class="kw">fn </span>write_gather(<span class="kw-2">&mut </span><span class="self">self</span>, values: <span class="kw-2">&</span><span class="self">Self</span>::Values, indices: <span class="kw-2">&</span>[usize]) -> <span class="prelude-ty">Result</span><()> { |
| <span class="self">self</span>.num_values += indices.len(); |
| <span class="kw">let </span>slice: Vec<<span class="kw">_</span>> = indices.iter().map(|idx| values[<span class="kw-2">*</span>idx].clone()).collect(); |
| <span class="self">self</span>.write_slice(<span class="kw-2">&</span>slice) |
| } |
| |
| <span class="kw">fn </span>num_values(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.num_values |
| } |
| |
| <span class="kw">fn </span>has_dictionary(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.dict_encoder.is_some() |
| } |
| |
| <span class="kw">fn </span>estimated_dict_page_size(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="prelude-val">Some</span>(<span class="self">self</span>.dict_encoder.as_ref()<span class="question-mark">?</span>.dict_encoded_size()) |
| } |
| |
| <span class="kw">fn </span>estimated_data_page_size(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="kw">match </span><span class="kw-2">&</span><span class="self">self</span>.dict_encoder { |
| <span class="prelude-val">Some</span>(encoder) => encoder.estimated_data_encoded_size(), |
| <span class="kw">_ </span>=> <span class="self">self</span>.encoder.estimated_data_encoded_size(), |
| } |
| } |
| |
| <span class="kw">fn </span>flush_dict_page(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><DictionaryPage>> { |
| <span class="kw">match </span><span class="self">self</span>.dict_encoder.take() { |
| <span class="prelude-val">Some</span>(encoder) => { |
| <span class="kw">if </span><span class="self">self</span>.num_values != <span class="number">0 </span>{ |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="macro">general_err!</span>( |
| <span class="string">"Must flush data pages before flushing dictionary" |
| </span>)); |
| } |
| |
| <span class="kw">let </span>buf = encoder.write_dict()<span class="question-mark">?</span>; |
| |
| <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(DictionaryPage { |
| buf, |
| num_values: encoder.num_entries(), |
| is_sorted: encoder.is_sorted(), |
| })) |
| } |
| <span class="kw">_ </span>=> <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>), |
| } |
| } |
| |
| <span class="kw">fn </span>flush_data_page(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><DataPageValues<T::T>> { |
| <span class="kw">let </span>(buf, encoding) = <span class="kw">match </span><span class="kw-2">&mut </span><span class="self">self</span>.dict_encoder { |
| <span class="prelude-val">Some</span>(encoder) => (encoder.write_indices()<span class="question-mark">?</span>, Encoding::RLE_DICTIONARY), |
| <span class="kw">_ </span>=> (<span class="self">self</span>.encoder.flush_buffer()<span class="question-mark">?</span>, <span class="self">self</span>.encoder.encoding()), |
| }; |
| |
| <span class="prelude-val">Ok</span>(DataPageValues { |
| buf, |
| encoding, |
| num_values: std::mem::take(<span class="kw-2">&mut </span><span class="self">self</span>.num_values), |
| min_value: <span class="self">self</span>.min_value.take(), |
| max_value: <span class="self">self</span>.max_value.take(), |
| }) |
| } |
| } |
| |
| <span class="kw">fn </span>get_min_max<<span class="lifetime">'a</span>, T, I>(descr: <span class="kw-2">&</span>ColumnDescriptor, <span class="kw-2">mut </span>iter: I) -> <span class="prelude-ty">Option</span><(T, T)> |
| <span class="kw">where |
| </span>T: ParquetValueType + <span class="lifetime">'a</span>, |
| I: Iterator<Item = <span class="kw-2">&</span><span class="lifetime">'a </span>T>, |
| { |
| <span class="kw">let </span>first = <span class="kw">loop </span>{ |
| <span class="kw">let </span>next = iter.next()<span class="question-mark">?</span>; |
| <span class="kw">if </span>!is_nan(descr, next) { |
| <span class="kw">break </span>next; |
| } |
| }; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>min = first; |
| <span class="kw">let </span><span class="kw-2">mut </span>max = first; |
| <span class="kw">for </span>val <span class="kw">in </span>iter { |
| <span class="kw">if </span>is_nan(descr, val) { |
| <span class="kw">continue</span>; |
| } |
| <span class="kw">if </span>compare_greater(descr, min, val) { |
| min = val; |
| } |
| <span class="kw">if </span>compare_greater(descr, val, max) { |
| max = val; |
| } |
| } |
| |
| <span class="comment">// Float/Double statistics have special case for zero. |
| // |
| // If computed min is zero, whether negative or positive, |
| // the spec states that the min should be written as -0.0 |
| // (negative zero) |
| // |
| // For max, it has similar logic but will be written as 0.0 |
| // (positive zero) |
| </span><span class="kw">let </span>min = replace_zero(min, descr, -<span class="number">0.0</span>); |
| <span class="kw">let </span>max = replace_zero(max, descr, <span class="number">0.0</span>); |
| |
| <span class="prelude-val">Some</span>((min, max)) |
| } |
| |
| <span class="attr">#[inline] |
| </span><span class="kw">fn </span>replace_zero<T: ParquetValueType>(val: <span class="kw-2">&</span>T, descr: <span class="kw-2">&</span>ColumnDescriptor, replace: f32) -> T { |
| <span class="kw">match </span>T::PHYSICAL_TYPE { |
| Type::FLOAT <span class="kw">if </span>f32::from_le_bytes(val.as_bytes().try_into().unwrap()) == <span class="number">0.0 </span>=> { |
| T::try_from_le_slice(<span class="kw-2">&</span>f32::to_le_bytes(replace)).unwrap() |
| } |
| Type::DOUBLE <span class="kw">if </span>f64::from_le_bytes(val.as_bytes().try_into().unwrap()) == <span class="number">0.0 </span>=> { |
| T::try_from_le_slice(<span class="kw-2">&</span>f64::to_le_bytes(replace <span class="kw">as </span>f64)).unwrap() |
| } |
| Type::FIXED_LEN_BYTE_ARRAY |
| <span class="kw">if </span>descr.logical_type() == <span class="prelude-val">Some</span>(LogicalType::Float16) |
| && f16::from_le_bytes(val.as_bytes().try_into().unwrap()) == f16::NEG_ZERO => |
| { |
| T::try_from_le_slice(<span class="kw-2">&</span>f16::to_le_bytes(f16::from_f32(replace))).unwrap() |
| } |
| <span class="kw">_ </span>=> val.clone(), |
| } |
| } |
| </code></pre></div></section></main></body></html> |
