26 lines
713 B
Text
26 lines
713 B
Text
use std::collections::HashMap;
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fn main() {
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let table_a = vec![
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(27, "Jonah"), (18, "Alan"), (28, "Glory"),
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(18, "Popeye"), (28, "Alan")
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];
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let table_b = vec![
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("Jonah", "Whales"), ("Jonah", "Spiders"), ("Alan", "Ghosts"),
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("Alan", "Zombies"), ("Glory", "Buffy")
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];
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// hash phase
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let mut h = HashMap::new();
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for (i, a) in table_a.iter().enumerate() {
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h.entry(a.1).or_insert_with(Vec::new).push(i);
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}
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// join phase
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for b in table_b {
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if let Some(vals) = h.get(b.0) {
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for &val in vals {
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let a = table_a.get(val).unwrap();
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println!("{:?} {:?}", a, b);
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}
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}
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}
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}
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