DSL functions for summary stats over arrays / maps (#1364)

* DSL stats functions [WIP]

* refactor

* move percentile computation to bifs module; iterate

* mode and antimode

* percentile iterate

* percentile sketching

* neaten

* unit-test iterate

* unify old & new min & max functions

* unit-test cases

* code-dedupe between mode and antimode

* make mode/antimode ties deterministic via first-found-wins rule

* online help strings for new stats DSL functions

* artifacts from `make dev`

* help info on how min/max now recurse into collections

* artifacts from `make dev`

* typofix

docs/src/data-diving-examples.md

@@ -160,11 +160,11 @@ CITRUS COUNTY       1332.9                 79974.9                483785.1
 <b>  stats2 -a corr,linreg-ols,r2 -f tiv_2011,tiv_2012</b>
 </pre>
 <pre class="pre-non-highlight-in-pair">
-tiv_2011_tiv_2012_corr  0.9730497632351692
-tiv_2011_tiv_2012_ols_m 0.9835583980337723
-tiv_2011_tiv_2012_ols_b 433854.6428968317
+tiv_2011_tiv_2012_corr  0.9730497632351701
+tiv_2011_tiv_2012_ols_m 0.9835583980337732
+tiv_2011_tiv_2012_ols_b 433854.6428968301
 tiv_2011_tiv_2012_ols_n 36634
-tiv_2011_tiv_2012_r2    0.9468258417320189
+tiv_2011_tiv_2012_r2    0.9468258417320204
 </pre>
 
 <pre class="pre-highlight-in-pair">
@@ -322,7 +322,7 @@ Look at bivariate stats by color and shape. In particular, `u,v` pairwise correl
 </pre>
 <pre class="pre-non-highlight-in-pair">
           u_v_corr              w_x_corr
-0.1334180491027861 -0.011319841199866178
+0.1334180491027861 -0.011319841199852926
 </pre>
 
 <pre class="pre-highlight-in-pair">
@@ -332,22 +332,22 @@ Look at bivariate stats by color and shape. In particular, `u,v` pairwise correl
 </pre>
 <pre class="pre-non-highlight-in-pair">
  color    shape              u_v_corr               w_x_corr
-   red   circle    0.9807984401887236   -0.01856553658708754
-orange   square   0.17685855992752927   -0.07104431573806054
- green   circle   0.05764419437577255    0.01179572988801509
-   red   square   0.05574477124893523 -0.0006801456507510942
-yellow triangle   0.04457273771962798   0.024604310103081825
-yellow   square   0.04379172927296089   -0.04462197201631237
-purple   circle   0.03587354936895086     0.1341133954140899
-  blue   square   0.03241153095761164  -0.053507648119643196
-  blue triangle  0.015356427073158766 -0.0006089997461435399
-orange   circle  0.010518953877704048   -0.16279397329279383
-   red triangle   0.00809782571528034   0.012486621357942596
-purple triangle  0.005155190909099334  -0.045057909256220656
-purple   square -0.025680276963377404    0.05769429647930396
- green   square   -0.0257760734502851  -0.003265173252087127
-orange triangle -0.030456661186085785    -0.1318699981926352
-yellow   circle  -0.06477331572781474    0.07369449819706045
-  blue   circle  -0.10234761901929677  -0.030528539069837757
- green triangle  -0.10901825107358765   -0.04848782060162929
+   red   circle    0.9807984401887242  -0.018565536587084836
+orange   square   0.17685855992752933   -0.07104431573805543
+ green   circle   0.05764419437577257   0.011795729888018455
+   red   square    0.0557447712489348 -0.0006801456507506415
+yellow triangle    0.0445727377196281   0.024604310103079844
+yellow   square    0.0437917292729612  -0.044621972016306265
+purple   circle   0.03587354936895115    0.13411339541407613
+  blue   square   0.03241153095761152   -0.05350764811965621
+  blue triangle  0.015356427073158612 -0.0006089997461408209
+orange   circle  0.010518953877704181    -0.1627939732927932
+   red triangle   0.00809782571528054    0.01248662135795501
+purple triangle  0.005155190909099739   -0.04505790925621933
+purple   square  -0.02568027696337717   0.057694296479293694
+ green   square -0.025776073450284875 -0.0032651732520739014
+orange triangle -0.030456661186085584   -0.13186999819263814
+yellow   circle  -0.06477331572781515     0.0736944981970553
+  blue   circle   -0.1023476190192966  -0.030528539069839333
+ green triangle  -0.10901825107358747   -0.04848782060162855
 </pre>

docs/src/dkvp-examples.md

@@ -251,6 +251,7 @@ a=eks,b=pan,i=2,y=0.522151,ab=ekspan,iy=2.522151,ta=String,tb=String,ti=Integer,
 a=wye,b=wye,i=3,y=0.338318,ab=wyewye,iy=3.338318,ta=String,tb=String,ti=Integer,ty=Float,tab=String,tiy=Float
 a=eks,b=wye,i=4,y=0.134188,ab=ekswye,iy=4.134188,ta=String,tb=String,ti=Integer,ty=Float,tab=String,tiy=Float
 a=wye,b=pan,i=5,y=0.863624,ab=wyepan,iy=5.863624,ta=String,tb=String,ti=Integer,ty=Float,tab=String,tiy=Float
+/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/universal-darwin22/rbconfig.rb:21: warning: Insecure world writable dir /usr/local/bin in PATH, mode 040777
 </pre>
 
 Run as-is, then pipe to Miller for pretty-printing:
@@ -265,4 +266,5 @@ eks pan 2 0.522151 ekspan 2.522151 String String Integer Float String Float
 wye wye 3 0.338318 wyewye 3.338318 String String Integer Float String Float
 eks wye 4 0.134188 ekswye 4.134188 String String Integer Float String Float
 wye pan 5 0.863624 wyepan 5.863624 String String Integer Float String Float
+/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/universal-darwin22/rbconfig.rb:21: warning: Insecure world writable dir /usr/local/bin in PATH, mode 040777
 </pre>