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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 super</span>::{CellValue, SimpleColIter, SimpleColRange, SimpleValue};
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<span class="kw">use </span><span class="kw">crate</span>::columnar::{
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column_range::{RleRange, ValueIter, ValueRange},
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encoding::{col_error::DecodeColumnError, RleDecoder},
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};
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<span class="doccomment">/// A group column range is one with a "num" column and zero or more "grouped" columns. The "num"
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/// column contains RLE encoded u64s, each `u64` represents the number of values to read from each
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/// of the grouped columns in order to produce a `CellValue::Group` for the current row.
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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">struct </span>GroupRange {
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<span class="kw">pub</span>(<span class="kw">crate</span>) num: RleRange<u64>,
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<span class="kw">pub</span>(<span class="kw">crate</span>) values: Vec<GroupedColumnRange>,
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}
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<span class="kw">impl </span>GroupRange {
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<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new(num: RleRange<u64>, values: Vec<GroupedColumnRange>) -> <span class="self">Self </span>{
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<span class="self">Self </span>{ num, values }
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}
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<span class="attr">#[allow(dead_code)]
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</span><span class="kw">pub</span>(<span class="kw">crate</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]) -> GroupIter<<span class="lifetime">'a</span>> {
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GroupIter {
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num: <span class="self">self</span>.num.decoder(data),
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values: <span class="self">self</span>.values.iter().map(|v| v.iter(data)).collect(),
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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">let </span>start = <span class="self">self</span>.num.start();
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<span class="kw">let </span>end = <span class="self">self
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</span>.values
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.last()
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.map(|v| v.range().end)
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.unwrap_or_else(|| <span class="self">self</span>.num.end());
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start..end
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}
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}
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<span class="doccomment">/// The type of ranges which can be the "grouped" columns in a `GroupRange`
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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>GroupedColumnRange {
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Value(ValueRange),
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Simple(SimpleColRange),
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}
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<span class="kw">impl </span>GroupedColumnRange {
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<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]) -> GroupedColIter<<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>::Value(vr) => GroupedColIter::Value(vr.iter(data)),
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<span class="self">Self</span>::Simple(sc) => GroupedColIter::Simple(sc.iter(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>::Value(vr) => vr.range(),
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<span class="self">Self</span>::Simple(s) => s.range(),
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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">struct </span>GroupIter<<span class="lifetime">'a</span>> {
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num: RleDecoder<<span class="lifetime">'a</span>, u64>,
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values: Vec<GroupedColIter<<span class="lifetime">'a</span>>>,
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||
}
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||
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<span class="kw">impl</span><<span class="lifetime">'a</span>> GroupIter<<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><CellValue>, DecodeColumnError> {
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<span class="kw">let </span>num = <span class="self">self
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||
</span>.num
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||
.next()
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||
.transpose()
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||
.map_err(|e| DecodeColumnError::decode_raw(<span class="string">"num"</span>, e))<span class="question-mark">?</span>;
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||
<span class="kw">match </span>num {
|
||
<span class="prelude-val">None </span>=> <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>),
|
||
<span class="prelude-val">Some</span>(<span class="prelude-val">None</span>) => <span class="prelude-val">Err</span>(DecodeColumnError::unexpected_null(<span class="string">"num"</span>)),
|
||
<span class="prelude-val">Some</span>(<span class="prelude-val">Some</span>(num)) => {
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||
<span class="kw">let </span><span class="kw-2">mut </span>row = Vec::new();
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||
<span class="kw">for _ in </span><span class="number">0</span>..num {
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||
<span class="kw">let </span><span class="kw-2">mut </span>inner_row = Vec::new();
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<span class="kw">for </span>(index, value_col) <span class="kw">in </span><span class="self">self</span>.values.iter_mut().enumerate() {
|
||
<span class="kw">match </span>value_col.next().transpose()<span class="question-mark">? </span>{
|
||
<span class="prelude-val">None </span>=> {
|
||
<span class="kw">return </span><span class="prelude-val">Err</span>(DecodeColumnError::unexpected_null(<span class="macro">format!</span>(
|
||
<span class="string">"col {}"</span>,
|
||
index
|
||
)))
|
||
}
|
||
<span class="prelude-val">Some</span>(v) => {
|
||
inner_row.push(v);
|
||
}
|
||
}
|
||
}
|
||
row.push(inner_row);
|
||
}
|
||
<span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(CellValue::Group(row)))
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span><<span class="lifetime">'a</span>> Iterator <span class="kw">for </span>GroupIter<<span class="lifetime">'a</span>> {
|
||
<span class="kw">type </span>Item = <span class="prelude-ty">Result</span><CellValue, DecodeColumnError>;
|
||
|
||
<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> {
|
||
<span class="self">self</span>.try_next().transpose()
|
||
}
|
||
}
|
||
|
||
<span class="attr">#[derive(Debug, Clone)]
|
||
</span><span class="kw">enum </span>GroupedColIter<<span class="lifetime">'a</span>> {
|
||
Value(ValueIter<<span class="lifetime">'a</span>>),
|
||
Simple(SimpleColIter<<span class="lifetime">'a</span>>),
|
||
}
|
||
|
||
<span class="kw">impl</span><<span class="lifetime">'a</span>> GroupedColIter<<span class="lifetime">'a</span>> {
|
||
<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>, DecodeColumnError> {
|
||
<span class="kw">match </span><span class="self">self </span>{
|
||
<span class="self">Self</span>::Value(viter) => <span class="prelude-val">Ok</span>(viter.next().transpose()<span class="question-mark">?</span>.map(SimpleValue::Value)),
|
||
<span class="self">Self</span>::Simple(siter) => siter
|
||
.next()
|
||
.transpose()
|
||
.map_err(|e| DecodeColumnError::decode_raw(<span class="string">"a simple column"</span>, e)),
|
||
}
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span><<span class="lifetime">'a</span>> Iterator <span class="kw">for </span>GroupedColIter<<span class="lifetime">'a</span>> {
|
||
<span class="kw">type </span>Item = <span class="prelude-ty">Result</span><SimpleValue, DecodeColumnError>;
|
||
|
||
<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> {
|
||
<span class="self">self</span>.try_next().transpose()
|
||
}
|
||
}
|
||
</code></pre></div>
|
||
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