dev: avoid rerunning unchanged tests

Beforehand, running `dev testlogic` would always run all
tests regarldess if they were changed or not, which wastes
time. This PR will check to see which test folders were
modified and only run them if they are modified.

Fixes: #94845
Release note: None

pkg/cmd/dev/testlogic.go

@@ -97,6 +97,8 @@ func (d *dev) testlogic(cmd *cobra.Command, commandLine []string) error {
 		ignoreCache = true
 	}
 
+	changes, _ := d.exec.CommandContextSilent(ctx, "git", "status")
+	modifiedTestPrefix := "modified:   pkg/"
 	validChoices := []string{"base", "ccl", "opt", "sqlite", "sqliteccl"}
 	if len(choices) == 0 {
 		// Default to all targets if --bigtest, else all non-sqlite targets.
@@ -105,7 +107,10 @@ func (d *dev) testlogic(cmd *cobra.Command, commandLine []string) error {
 		} else {
 			for _, choice := range validChoices {
 				if !strings.HasPrefix(choice, "sqlite") {
-					choices = append(choices, choice)
+					// Only append if the non-sqlite tests are modified
+					if strings.Contains(string(changes), modifiedTestPrefix+choice) {
+						choices = append(choices, choice)
+					}
 				}
 			}
 		}