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</pre><pre class="rust"><code><span class="kw">use </span>std::ops::Range;
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<span class="kw">use </span><span class="kw">crate</span>::columnar::{
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column_range::{BooleanRange, DeltaRange, RleRange},
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encoding::{raw, BooleanDecoder, DeltaDecoder, RleDecoder},
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};
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<span class="kw">use </span><span class="kw">super</span>::SimpleValue;
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<span class="doccomment">/// The four types of "simple" column defined in the raw format
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</span><span class="attr">#[derive(Debug, Clone)]
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</span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">enum </span>SimpleColRange {
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<span class="doccomment">/// A column containing RLE encoded u64's
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</span>RleInt(RleRange<u64>),
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<span class="doccomment">/// A column containing RLE encoded strings
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</span>RleString(RleRange<smol_str::SmolStr>),
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<span class="doccomment">/// A column containing delta -> RLE encoded i64s
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</span>Delta(DeltaRange),
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<span class="doccomment">/// A column containing boolean values
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</span>Boolean(BooleanRange),
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}
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<span class="kw">impl </span>SimpleColRange {
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<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>iter<<span class="lifetime">'a</span>>(<span class="kw-2">&</span><span class="self">self</span>, data: <span class="kw-2">&</span><span class="lifetime">'a </span>[u8]) -> SimpleColIter<<span class="lifetime">'a</span>> {
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<span class="kw">match </span><span class="self">self </span>{
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<span class="self">Self</span>::RleInt(r) => SimpleColIter::RleInt(r.decoder(data)),
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<span class="self">Self</span>::RleString(r) => SimpleColIter::RleString(r.decoder(data)),
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<span class="self">Self</span>::Delta(r) => SimpleColIter::Delta(r.decoder(data)),
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<span class="self">Self</span>::Boolean(r) => SimpleColIter::Boolean(r.decoder(data)),
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}
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}
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<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>range(<span class="kw-2">&</span><span class="self">self</span>) -> Range<usize> {
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<span class="kw">match </span><span class="self">self </span>{
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<span class="self">Self</span>::RleInt(r) => r.clone().into(),
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<span class="self">Self</span>::RleString(r) => r.clone().into(),
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<span class="self">Self</span>::Delta(r) => r.clone().into(),
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<span class="self">Self</span>::Boolean(r) => r.clone().into(),
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}
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}
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}
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<span class="attr">#[derive(Debug, Clone)]
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</span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">enum </span>SimpleColIter<<span class="lifetime">'a</span>> {
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RleInt(RleDecoder<<span class="lifetime">'a</span>, u64>),
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RleString(RleDecoder<<span class="lifetime">'a</span>, smol_str::SmolStr>),
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Delta(DeltaDecoder<<span class="lifetime">'a</span>>),
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Boolean(BooleanDecoder<<span class="lifetime">'a</span>>),
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}
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<span class="kw">impl</span><<span class="lifetime">'a</span>> SimpleColIter<<span class="lifetime">'a</span>> {
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<span class="kw">fn </span>try_next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><SimpleValue>, raw::Error> {
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<span class="kw">match </span><span class="self">self </span>{
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<span class="self">Self</span>::RleInt(d) => read_col(d, SimpleValue::Uint),
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<span class="self">Self</span>::RleString(d) => read_col(d, SimpleValue::String),
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<span class="self">Self</span>::Delta(d) => read_col(d, SimpleValue::Int),
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<span class="self">Self</span>::Boolean(d) => <span class="prelude-val">Ok</span>(d.next().transpose()<span class="question-mark">?</span>.map(SimpleValue::Bool)),
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}
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}
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}
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<span class="kw">fn </span>read_col<C, T, F, U>(<span class="kw-2">mut </span>col: C, f: F) -> <span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><U>, raw::Error>
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<span class="kw">where
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</span>C: Iterator<Item = <span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><T>, raw::Error>>,
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F: Fn(<span class="prelude-ty">Option</span><T>) -> U,
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{
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col.next().transpose().map(|v| v.map(f))
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}
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<span class="kw">impl</span><<span class="lifetime">'a</span>> Iterator <span class="kw">for </span>SimpleColIter<<span class="lifetime">'a</span>> {
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<span class="kw">type </span>Item = <span class="prelude-ty">Result</span><SimpleValue, raw::Error>;
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<span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> {
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<span class="self">self</span>.try_next().transpose()
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}
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}
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</code></pre></div>
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