ci/eval: remove left-over stats.json

This seems to be a left-over from before the performance comparison was
changed to a difference-per-chunk analysis.

(cherry picked from commit edaf51cb83)

ci/eval/default.nix

@@ -8,7 +8,6 @@
   procps,
   nixVersions,
   jq,
-  sta,
   python3,
 }:
 
@@ -188,10 +187,7 @@ let
           rm "$chunkOutputDir"/stats/"$seq_end"
         fi
 
-        # Make sure the glob doesn't break when there's no files
-        shopt -s nullglob
         cat "$chunkOutputDir"/result/* > $out/paths
-        cat "$chunkOutputDir"/stats/* > $out/stats.jsonstream
       '';
 
   combine =
@@ -202,7 +198,6 @@ let
       {
         nativeBuildInputs = [
           jq
-          sta
         ];
       }
       ''
@@ -225,39 +220,6 @@ let
             ) | from_entries
           ' > $out/outpaths.json
 
-        # Computes min, mean, error, etc. for a list of values and outputs a JSON from that
-        statistics() {
-          local stat=$1
-          sta --transpose |
-            jq --raw-input --argjson stat "$stat" -n '
-              [
-                inputs |
-                  split("\t") |
-                  { key: .[0], value: (.[1] | fromjson) }
-              ] |
-                from_entries |
-                {
-                  key: ($stat | join(".")),
-                  value: .
-                }'
-        }
-
-        # Gets all available number stats (without .sizes because those are constant and not interesting)
-        readarray -t stats < <(jq -cs '.[0] | del(.sizes) | paths(type == "number")' ${resultsDir}/*/stats.jsonstream)
-
-        # Combines the statistics from all evaluations
-        {
-          echo "{ \"key\": \"minAvailMemory\", \"value\": $(cat ${resultsDir}/*/min-avail-memory | sta --brief --min) }"
-          echo "{ \"key\": \"minFreeSwap\", \"value\": $(cat ${resultsDir}/*/min-free-swap | sta --brief --min) }"
-          cat ${resultsDir}/*/total-time | statistics '["totalTime"]'
-          for stat in "''${stats[@]}"; do
-            cat ${resultsDir}/*/stats.jsonstream |
-              jq --argjson stat "$stat" 'getpath($stat)' |
-              statistics "$stat"
-          done
-        } |
-          jq -s from_entries > $out/stats.json
-
         mkdir -p $out/stats
 
         for d in ${resultsDir}/*; do