Revert "DROP: printPairs"

This reverts commit 2054a7f.

coordinator/src/test/scala/filodb.coordinator/queryplanner/PlannerHierarchySpec.scala

@@ -18,9 +18,6 @@ import filodb.prometheus.parse.Parser.Antlr
 import filodb.query.{BadQueryException, IntervalSelector, LabelCardinality, PlanValidationSpec, RawSeries}
 import filodb.query.exec._
 
-
-import scala.collection.mutable
-
 // scalastyle:off line.size.limit
 // scalastyle:off number.of.methods
 class PlannerHierarchySpec extends AnyFunSpec with Matchers with PlanValidationSpec {
@@ -593,18 +590,6 @@ class PlannerHierarchySpec extends AnyFunSpec with Matchers with PlanValidationS
     validatePlan(execPlan, expected)
   }
 
-  class QueryExpectedPairs {
-    val pairs = new mutable.ArrayBuffer[(String, String)]
-    def addPair(query: String, plan: ExecPlan): Unit = {
-      pairs.append((query, plan.printTree().replaceAll("\n", "\n    |")))
-    }
-    def printPairs(): Unit = {
-      for ((query, expected) <- pairs) {
-        println(s"""(\"\"\"$query\"\"\",\n  \"\"\"$expected\"\"\".stripMargin),""")
-      }
-    }
-  }
-
 
   it("should not pushdown root scalar operation into a RemoteExec's promql when query spans multiple partitions") {
     val queryExpectedPairs = Seq(