Merge pull request #874 from lucianojoublanc-da/main

Add cases for sql EXPLAIN command, and a unit test.

Author: mpilquist

modules/core/shared/src/main/scala/data/Completion.scala

@@ -60,6 +60,7 @@ object Completion {
   case object AlterTrigger              extends Completion
   case object DropTrigger               extends Completion
   case object SetConstraints            extends Completion
+  case object Explain                   extends Completion
   // more ...
 
   /**

modules/core/shared/src/main/scala/net/message/CommandComplete.scala

@@ -98,6 +98,7 @@ object CommandComplete {
     case Patterns.Insert(s)           => apply(Completion.Insert(s.drop(2).toInt))
     case Patterns.Copy(s)             => apply(Completion.Copy(s.toInt))
     case "SET CONSTRAINTS"            => apply(Completion.SetConstraints)
+    case "EXPLAIN"                    => apply(Completion.Explain)
     // more .. fill in as we hit them
 
     case s                  => apply(Completion.Unknown(s))

modules/tests/shared/src/test/scala/QueryTest.scala

@@ -2,7 +2,7 @@
 // This software is licensed under the MIT License (MIT).
 // For more information see LICENSE or https://opensource.org/licenses/MIT
 
-package test
+package tests
 
 import skunk._
 import skunk.codec.all._
@@ -132,4 +132,13 @@ class QueryTest extends SkunkTest {
         }
       } yield "ok"
     }
+
+  sessionTest("explain query") { s =>
+    for {
+      c <- s.unique(sql"""EXPLAIN SELECT * FROM city""".query(skunk.codec.all.text))
+      _ <- assert("completion", c.startsWith("Seq Scan on city"))
+      _ <- s.assertHealthy
+    } yield "ok"
+  }
+
 }