payload: {"action":"created","comment":{"url":"https://api.github.com/repos/slamdata/quasar/pulls/comments/282912478","pull_request_review_id":236142761,"id":282912478,"node_id":"MDI0OlB1bGxSZXF1ZXN0UmV2aWV3Q29tbWVudDI4MjkxMjQ3OA==","diff_hunk":"@@ -0,0 +1,395 @@\n+/*\n+ * Copyright 2014–2018 SlamData Inc.\n+ *\n+ * Licensed under the Apache License, Version 2.0 (the \"License\");\n+ * you may not use this file except in compliance with the License.\n+ * You may obtain a copy of the License at\n+ *\n+ *     http://www.apache.org/licenses/LICENSE-2.0\n+ *\n+ * Unless required by applicable law or agreed to in writing, software\n+ * distributed under the License is distributed on an \"AS IS\" BASIS,\n+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n+ * See the License for the specific language governing permissions and\n+ * limitations under the License.\n+ */\n+\n+package quasar.impl.provenance\n+\n+import slamdata.Predef.{Int, None, Set, Some, StringContext}\n+\n+import quasar.Qspec\n+import quasar.qscript.provenance.CatsNonEmptyListGenerator\n+\n+import scala.Predef.$conforms\n+\n+import cats.data.NonEmptyList\n+import cats.instances.int._\n+import cats.instances.option._\n+import cats.kernel.laws.discipline.{SemilatticeTests, EqTests}\n+import cats.syntax.eq._\n+import cats.syntax.foldable._\n+import cats.syntax.list._\n+\n+import org.specs2.matcher._\n+import org.specs2.mutable.SpecificationLike\n+import org.specs2.scalacheck.Parameters\n+\n+import org.typelevel.discipline.specs2.mutable.Discipline\n+\n+import shims._\n+\n+object IdentitiesSpec extends Qspec\n+    with SpecificationLike\n+    with IdentitiesGenerator\n+    with CatsNonEmptyListGenerator\n+    with Discipline {\n+\n+  implicit val params = Parameters(maxSize = 10)\n+\n+  type Vecs = NonEmptyList[NonEmptyList[NonEmptyList[Int]]]\n+\n+  def beEquivalentToDistinct(vecs: Vecs): Matcher[Identities[Int]] =\n+    new Matcher[Identities[Int]] {\n+      def apply[S <: Identities[Int]](ex: Expectable[S]) = {\n+        val exp = ex.value.expanded\n+        val distinct = vecs.distinct\n+\n+        def x = distinct.forall(v => exp.exists(_ eqv v))\n+        def y = exp.forall(v => distinct.exists(_ eqv v))\n+\n+        result(x && y, \"are equivalent\", s\"are not equivalent\\nexpected: ${distinct.show}\\nactual: ${exp.show}\", ex)\n+      }\n+    }\n+\n+  def vecs(v: NonEmptyList[Int], vs: NonEmptyList[Int]*): Vecs =\n+    NonEmptyList.of(v, vs: _*).map(_.map(NonEmptyList.one(_)))\n+\n+  \"roundtrips distinct vectors\" >> prop { vecs: Vecs =>\n+    Identities.collapsed(vecs) must beEquivalentToDistinct(vecs)\n+  }\n+\n+  \"breadth is number of distinct vectors\" >> prop { vecs: Vecs =>\n+    Identities.collapsed(vecs).breadth must_=== vecs.distinct.length\n+  }\n+\n+  \"depth is length of longest vector\" >> prop { vecs: Vecs =>\n+    val depth = vecs.map(_.length).maximumOption getOrElse 0\n+    Identities.collapsed(vecs).depth must_=== depth\n+  }\n+\n+  \"initRegions\" >> {\n+    \"undefined on singleton vector\" >> {\n+      Identities(42).initRegions must beNone\n+    }\n+\n+    \"elides singleton vectors from set\" >> prop { (x: Int, y: Int, ys: NonEmptyList[Int]) =>\n+      val a = Identities(x)\n+      val b = Identities.fromReducible(ys)\n+\n+      a.merge(b :+ y).initRegions eqv Some(b)","path":"impl/src/test/scala/quasar/impl/provenance/IdentitiesSpec.scala","position":90,"original_position":90,"commit_id":"23edb7204dbcb07bde4f6b191d4e7fd7688f45dc","original_commit_id":"23edb7204dbcb07bde4f6b191d4e7fd7688f45dc","user":{"login":"wemrysi","id":32185,"node_id":"MDQ6VXNlcjMyMTg1","avatar_url":"https://avatars3.githubusercontent.com/u/32185?v=4","gravatar_id":"","url":"https://api.github.com/users/wemrysi","html_url":"https://github.com/wemrysi","followers_url":"https://api.github.com/users/wemrysi/followers","following_url":"https://api.github.com/users/wemrysi/following{/other_user}","gists_url":"https://api.github.com/users/wemrysi/gists{/gist_id}","starred_url":"https://api.github.com/users/wemrysi/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/wemrysi/subscriptions","organizations_url":"https://api.github.com/users/wemrysi/orgs","repos_url":"https://api.github.com/users/wemrysi/repos","events_url":"https://api.github.com/users/wemrysi/events{/privacy}","received_events_url":"https://api.github.com/users/wemrysi/received_events","type":"User","site_admin":false},"body":"`must_===` doesn't use the `Eq` instance.","created_at":"2019-05-10T14:39:16Z","updated_at":"2019-05-10T14:39:16Z","html_url":"https://github.com/slamdata/quasar/pull/4127#discussion_r282912478","pull_request_url":"https://api.github.com/repos/slamdata/quasar/pulls/4127","author_association":"CONTRIBUTOR","_links":{"self":{"href":"https://api.github.com/repos/slamdata/quasar/pulls/comments/282912478"},"html":{"href":"https://github.com/slamdata/quasar/pull/4127#discussion_r282912478"},"pull_request":{"href":"https://api.github.com/repos/slamdata/quasar/pulls/4127"}},"in_reply_to_id":282690413},"pull_request":{"url":"https://api.github.com/repos/slamdata/quasar/pulls/4127","id":277471820,"node_id":"MDExOlB1bGxSZXF1ZXN0Mjc3NDcxODIw","html_url":"https://github.com/slamdata/quasar/pull/4127","diff_url":"https://github.com/slamdata/quasar/pull/4127.diff","patch_url":"https://github.com/slamdata/quasar/pull/4127.patch","issue_url":"https://api.github.com/repos/slamdata/quasar/issues/4127","number":4127,"state":"open","locked":false,"title":"Vectorized provenance","user":{"login":"wemrysi","id":32185,"node_id":"MDQ6VXNlcjMyMTg1","avatar_url":"https://avatars3.githubusercontent.com/u/32185?v=4","gravatar_id":"","url":"https://api.github.com/users/wemrysi","html_url":"https://github.com/wemrysi","followers_url":"https://api.github.com/users/wemrysi/followers","following_url":"https://api.github.com/users/wemrysi/following{/other_user}","gists_url":"https://api.github.com/users/wemrysi/gists{/gist_id}","starred_url":"https://api.github.com/users/wemrysi/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/wemrysi/subscriptions","organizations_url":"https://api.github.com/users/wemrysi/orgs","repos_url":"https://api.github.com/users/wemrysi/repos","events_url":"https://api.github.com/users/wemrysi/events{/privacy}","received_events_url":"https://api.github.com/users/wemrysi/received_events","type":"User","site_admin":false},"body":"Introduces a `Provenance` abstraction that aligns closely with the MRA formalism, replacing the previous implementation. Provides a reasonably efficient implementation loosely based on 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