add support and test for gen_random_uuid()

dialects/postgresql/src/main/kotlin/app/cash/sqldelight/dialects/postgresql/PostgreSqlTypeResolver.kt

@@ -87,6 +87,7 @@ class PostgreSqlTypeResolver(private val parentResolver: TypeResolver) : TypeRes
     "min" -> encapsulatingType(exprList, BLOB, TEXT, SMALL_INT, INTEGER, PostgreSqlType.INTEGER, BIG_INT, REAL).asNullable()
     "date_trunc" -> encapsulatingType(exprList, TIMESTAMP_TIMEZONE, TIMESTAMP)
     "now" -> IntermediateType(TIMESTAMP_TIMEZONE)
+    "gen_random_uuid" -> IntermediateType(PostgreSqlType.UUID)
     else -> null
   }
 

dialects/postgresql/src/test/fixtures_postgresql/uuids/Test.s

@@ -0,0 +1,7 @@
+CREATE TABLE uuid_test (
+  pk uuid
+);
+
+SELECT gen_random_uuid(), pk FROM uuid_test;
+
+INSERT INTO uuid_test(pk) SELECT gen_random_uuid();

sqldelight-gradle-plugin/src/test/integration-postgresql/src/main/sqldelight/app/cash/sqldelight/postgresql/integration/Uuids.sq

@@ -0,0 +1,9 @@
+CREATE TABLE uuids(
+  key uuid NOT NULL
+);
+
+insertUuid:
+  INSERT INTO uuids (key) VALUES (:key);
+
+randomUuid:
+  SELECT gen_random_uuid();

sqldelight-gradle-plugin/src/test/integration-postgresql/src/test/kotlin/app/cash/sqldelight/postgresql/integration/PostgreSqlTest.kt

@@ -186,4 +186,9 @@ class PostgreSqlTest {
       insertRef(RefTable(RefTable.Id(10), id))
     }
   }
+
+  @Test fun genRandomUuid() {
+    val uuid = database.datesQueries.randomUuid().executeAsOne()
+    assertThat(uuid).isNotNull()
+  }
 }