Add reports for frequently changed files

Author: JohT

cypher/GitLog/List_pairwise_changed_files.cypher

@@ -14,7 +14,7 @@ RETURN firstFileName
       ,firstFile.extension                                    AS firstFileExtension
       ,secondFile.extension                                   AS secondFileExtension
       ,firstFile.extension + '↔' + secondFile.extension       AS fileExtensionPair
-      ,toInteger(pairwiseChange.updateCommitCount)            AS updateCommitCount
+      ,pairwiseChange.updateCommitCount                       AS updateCommitCount
       ,pairwiseChange.updateCommitMinConfidence               AS updateCommitMinConfidence
       ,pairwiseChange.updateCommitSupport                     AS updateCommitSupport
       ,pairwiseChange.updateCommitLift                        AS updateCommitLift

cypher/GitLog/List_pairwise_changed_files_top_selected_metric.cypher

@@ -0,0 +1,41 @@
+// Get the top 4 file extensions that where changed together most often and list top 20 pair that were changed together for each of the top file extension pair by their highest commit lift (>1: changes more often than by random chance). Requires Add_CHANGED_TOGETHER_WITH_relationships_to_git_files.cypher to run first.
+
+MATCH (firstFile:Git:File)-[pairwiseChange:CHANGED_TOGETHER_WITH]-(secondFile:Git:File)
+WHERE firstFile.extension < secondFile.extension
+   OR (firstFile.extension = secondFile.extension AND elementId(firstFile) < elementId(secondFile))
+ WITH firstFile.extension + '↔' + secondFile.extension AS fileExtensionPair
+     ,count(DISTINCT pairwiseChange)                   AS pairCount
+ORDER BY pairCount DESC
+ WITH collect(fileExtensionPair)[0..4]                 AS top4FileExtensionPairs
+UNWIND top4FileExtensionPairs AS fileExtensionPair
+CALL {
+       WITH fileExtensionPair
+      MATCH (firstFile:Git:File)-[pairwiseChange:CHANGED_TOGETHER_WITH]-(secondFile:Git:File)
+      WHERE elementId(firstFile) < elementId(secondFile)
+        AND firstFile.extension + '↔' + secondFile.extension = fileExtensionPair
+       WITH *
+           ,coalesce(firstFile.relativePath, firstFile.fileName)   AS firstFileName
+           ,coalesce(secondFile.relativePath, secondFile.fileName) AS secondFileName
+     RETURN firstFile.name                                         AS firstFileNameShort
+           ,secondFile.name                                        AS secondFileNameShort
+           ,firstFileName
+           ,secondFileName
+           ,pairwiseChange[$selected_pair_metric]                  AS selectedMetric
+           ,pairwiseChange.updateCommitLift                        AS updateCommitLift
+           ,pairwiseChange.updateCommitCount                       AS updateCommitCount
+           ,pairwiseChange.updateCommitMinConfidence               AS updateCommitMinConfidence
+           ,pairwiseChange.updateCommitSupport                     AS updateCommitSupport
+           ,pairwiseChange.updateCommitJaccardSimilarity           AS updateCommitJaccardSimilarity
+      ORDER BY selectedMetric DESC, firstFileName ASC, secondFileName ASC
+      LIMIT 20
+}
+RETURN fileExtensionPair
+      ,firstFileNameShort
+      ,secondFileNameShort
+      ,updateCommitCount
+      ,updateCommitMinConfidence
+      ,updateCommitLift
+      ,updateCommitJaccardSimilarity
+      ,updateCommitSupport
+      ,firstFileName
+      ,secondFileName