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Support quartiles #273

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Support quartiles #273

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0c13b84
cmd/stats: add tests for --quartiles flag
May 28, 2021
040e198
cmd/stats: add --quartiles flag
May 28, 2021
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35 changes: 31 additions & 4 deletions src/cmd/stats.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -47,6 +47,8 @@ stats options:
This requires storing all CSV data in memory.
--median Show the median.
This requires storing all CSV data in memory.
--quartiles Show the quartiles.
This requires storing all CSV data in memory.
--nulls Include NULLs in the population size for computing
mean and standard deviation.
-j, --jobs <arg> The number of jobs to run in parallel.
Expand Down Expand Up @@ -75,6 +77,7 @@ struct Args {
flag_mode: bool,
flag_cardinality: bool,
flag_median: bool,
flag_quartiles: bool,
flag_nulls: bool,
flag_jobs: usize,
flag_output: Option<String>,
Expand Down Expand Up @@ -209,7 +212,8 @@ impl Args {
range: true,
dist: true,
cardinality: self.flag_cardinality || self.flag_everything,
median: self.flag_median || self.flag_everything,
median: self.flag_median && !self.flag_quartiles && !self.flag_everything,
quartiles: self.flag_quartiles || self.flag_everything,
mode: self.flag_mode || self.flag_everything,
})).take(record_len).collect()
}
Expand All @@ -220,7 +224,10 @@ impl Args {
"mean", "stddev",
];
let all = self.flag_everything;
if self.flag_median || all { fields.push("median"); }
if self.flag_median && !self.flag_quartiles && !all { fields.push("median"); }
if self.flag_quartiles || all {
fields.push("q1"); fields.push("q2"); fields.push("q3");
}
if self.flag_mode || all { fields.push("mode"); }
if self.flag_cardinality || all { fields.push("cardinality"); }
csv::StringRecord::from(fields)
Expand All @@ -235,6 +242,7 @@ struct WhichStats {
dist: bool,
cardinality: bool,
median: bool,
quartiles: bool,
mode: bool,
}

Expand All @@ -252,25 +260,28 @@ struct Stats {
online: Option<OnlineStats>,
mode: Option<Unsorted<Vec<u8>>>,
median: Option<Unsorted<f64>>,
quartiles: Option<Unsorted<f64>>,
which: WhichStats,
}

impl Stats {
fn new(which: WhichStats) -> Stats {
let (mut sum, mut minmax, mut online, mut mode, mut median) =
(None, None, None, None, None);
let (mut sum, mut minmax, mut online, mut mode, mut median, mut quartiles) =
(None, None, None, None, None, None);
if which.sum { sum = Some(Default::default()); }
if which.range { minmax = Some(Default::default()); }
if which.dist { online = Some(Default::default()); }
if which.mode || which.cardinality { mode = Some(Default::default()); }
if which.median { median = Some(Default::default()); }
if which.quartiles { quartiles = Some(Default::default()); }
Stats {
typ: Default::default(),
sum: sum,
minmax: minmax,
online: online,
mode: mode,
median: median,
quartiles: quartiles,
which: which,
}
}
Expand Down Expand Up @@ -299,6 +310,7 @@ impl Stats {
} else {
let n = from_bytes::<f64>(sample).unwrap();
self.median.as_mut().map(|v| { v.add(n); });
self.quartiles.as_mut().map(|v| { v.add(n); });
self.online.as_mut().map(|v| { v.add(n); });
}
}
Expand Down Expand Up @@ -343,6 +355,20 @@ impl Stats {
}
Some(v) => { pieces.push(v.to_string()); }
}
match self.quartiles.as_mut().and_then(|v| v.quartiles()) {
None => {
if self.which.quartiles {
pieces.push(empty());
pieces.push(empty());
pieces.push(empty());
}
}
Some((q1, q2, q3)) => {
pieces.push(q1.to_string());
pieces.push(q2.to_string());
pieces.push(q3.to_string());
}
}
match self.mode.as_mut() {
None => {
if self.which.mode {
Expand Down Expand Up @@ -377,6 +403,7 @@ impl Commute for Stats {
self.online.merge(other.online);
self.mode.merge(other.mode);
self.median.merge(other.median);
self.quartiles.merge(other.quartiles);
self.which.merge(other.which);
}
}
Expand Down
33 changes: 31 additions & 2 deletions tests/test_stats.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -91,15 +91,31 @@ fn setup<S>(name: S, rows: &[&str], headers: bool,
fn get_field_value(wrk: &Workdir, cmd: &mut process::Command, field: &str)
-> String {
if field == "median" { cmd.arg("--median"); }
if field == "quartiles" { cmd.arg("--quartiles"); }
if field == "cardinality" { cmd.arg("--cardinality"); }
if field == "mode" { cmd.arg("--mode"); }

let mut rows: Vec<Vec<String>> = wrk.read_stdout(cmd);
let headers = rows.remove(0);
let mut sequence: Vec<&str> = vec![];
for row in rows.iter() {
for (h, val) in headers.iter().zip(row.iter()) {
if &**h == field {
return val.clone();
match field {
"quartiles" => {
match &**h {
"q1" | "q2" => {
sequence.push(val);
},
"q3" => {
sequence.push(val);
return sequence.join(",").clone();
},
_ => {},
}
},
_ => {
if &**h == field { return val.clone(); }
},
}
}
}
Expand Down Expand Up @@ -127,16 +143,19 @@ stats_tests!(stats_infer_null_int_float_unicode, "type",
stats_tests!(stats_no_mean, "mean", &["a"], "");
stats_tests!(stats_no_stddev, "stddev", &["a"], "");
stats_tests!(stats_no_median, "median", &["a"], "");
stats_tests!(stats_no_quartiles, "quartiles", &["a"], ",,");
stats_tests!(stats_no_mode, "mode", &["a", "b"], "N/A");

stats_tests!(stats_null_mean, "mean", &[""], "");
stats_tests!(stats_null_stddev, "stddev", &[""], "");
stats_tests!(stats_null_median, "median", &[""], "");
stats_tests!(stats_null_quartiles, "quartiles", &[""], ",,");
stats_tests!(stats_null_mode, "mode", &[""], "N/A");

stats_tests!(stats_includenulls_null_mean, "mean", &[""], "", true);
stats_tests!(stats_includenulls_null_stddev, "stddev", &[""], "", true);
stats_tests!(stats_includenulls_null_median, "median", &[""], "", true);
stats_tests!(stats_includenulls_null_quartiles, "quartiles", &[""], ",,", true);
stats_tests!(stats_includenulls_null_mode, "mode", &[""], "N/A", true);

stats_tests!(stats_includenulls_mean,
Expand Down Expand Up @@ -180,6 +199,11 @@ stats_tests!(stats_median_even, "median", &["1", "2", "3", "4"], "2.5");
stats_tests!(stats_median_even_null, "median",
&["", "1", "2", "3", "4"], "2.5");
stats_tests!(stats_median_mix, "median", &["1", "2.5", "3"], "2.5");
stats_tests!(stats_quartiles, "quartiles", &["1", "2", "3"], "1,2,3");
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Can you also provide test when the input is &[""]?

stats_tests!(stats_quartiles_null, "quartiles", &["", "1", "2", "3"], "1,2,3");
stats_tests!(stats_quartiles_even, "quartiles", &["1", "2", "3", "4"], "1.5,2.5,3.5");
stats_tests!(stats_quartiles_even_null, "quartiles", &["", "1", "2", "3", "4"], "1.5,2.5,3.5");
stats_tests!(stats_quartiles_mix, "quartiles", &["1", "2.0", "3", "4"], "1.5,2.5,3.5");

mod stats_infer_nothing {
// Only test CSV data with headers.
Expand Down Expand Up @@ -208,6 +232,11 @@ mod stats_zero_median {
stats_test_headers!(stats_zero_median, "median", &[], "");
}

mod stats_zero_quartiles {
use super::test_stats;
stats_test_headers!(stats_zero_quartiles, "quartiles", &[], ",,");
}

mod stats_header_fields {
use super::test_stats;
stats_test_headers!(stats_header_field_name, "field", &["a"], "header");
Expand Down