Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/11557#discussion_r57279151
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/parser/ng/PlanParserSuite.scala
---
@@ -0,0 +1,408 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.spark.sql.catalyst.parser.ng
+
+import org.apache.spark.sql.Row
+import org.apache.spark.sql.catalyst.expressions._
+import org.apache.spark.sql.catalyst.plans._
+import org.apache.spark.sql.catalyst.plans.logical._
+import org.apache.spark.sql.types.IntegerType
+
+class PlanParserSuite extends PlanTest {
+ import CatalystSqlParser._
+ import org.apache.spark.sql.catalyst.dsl.expressions._
+ import org.apache.spark.sql.catalyst.dsl.plans._
+
+ def assertEqual(sqlCommand: String, plan: LogicalPlan): Unit = {
+ comparePlans(parsePlan(sqlCommand), plan)
+ }
+
+ def intercept(sqlCommand: String, messages: String*): Unit = {
+ val e = intercept[ParseException](parsePlan(sqlCommand))
+ messages.foreach { message =>
+ assert(e.message.contains(message))
+ }
+ }
+
+ test("case insensitive") {
+ val plan = table("a").select(star())
+ assertEqual("sELEct * FroM a", plan)
+ assertEqual("select * fRoM a", plan)
+ assertEqual("SELECT * FROM a", plan)
+ }
+
+ test("show functions") {
+ assertEqual("show functions", ShowFunctions(None, None))
+ assertEqual("show functions foo", ShowFunctions(None, Some("foo")))
+ assertEqual("show functions foo.bar", ShowFunctions(Some("foo"),
Some("bar")))
+ assertEqual("show functions 'foo\\\\.*'", ShowFunctions(None,
Some("foo\\.*")))
+ intercept("show functions foo.bar.baz", "SHOW FUNCTIONS unsupported
name")
+ }
+
+ test("describe function") {
+ assertEqual("describe function bar", DescribeFunction("bar",
isExtended = false))
+ assertEqual("describe function extended bar", DescribeFunction("bar",
isExtended = true))
+ assertEqual("describe function foo.bar", DescribeFunction("foo.bar",
isExtended = false))
+ assertEqual("describe function extended f.bar",
DescribeFunction("f.bar", isExtended = true))
+ }
+
+ test("set operations") {
+ val a = table("a").select(star())
+ val b = table("b").select(star())
+
+ assertEqual("select * from a union select * from b",
Distinct(a.unionAll(b)))
+ assertEqual("select * from a union distinct select * from b",
Distinct(a.unionAll(b)))
+ assertEqual("select * from a union all select * from b", a.unionAll(b))
+ assertEqual("select * from a except select * from b", a.except(b))
+ intercept("select * from a except all select * from b", "EXCEPT ALL is
not supported.")
+ assertEqual("select * from a except distinct select * from b",
a.except(b))
+ assertEqual("select * from a intersect select * from b",
a.intersect(b))
+ intercept("select * from a intersect all select * from b", "INTERSECT
ALL is not supported.")
+ assertEqual("select * from a intersect distinct select * from b",
a.intersect(b))
+ }
+
+ test("common table expressions") {
+ def cte(plan: LogicalPlan, namedPlans: (String, LogicalPlan)*): With =
{
+ val ctes = namedPlans.map {
+ case (name, cte) =>
+ name -> SubqueryAlias(name, cte)
+ }.toMap
+ With(plan, ctes)
+ }
+ assertEqual(
+ "with cte1 as (select * from a) select * from cte1",
+ cte(table("cte1").select(star()), "cte1" ->
table("a").select(star())))
+ assertEqual(
+ "with cte1 (select 1) select * from cte1",
+ cte(table("cte1").select(star()), "cte1" ->
OneRowRelation.select(1)))
+ assertEqual(
+ "with cte1 (select 1), cte2 as (select * from cte1) select * from
cte2",
+ cte(table("cte2").select(star()),
+ "cte1" -> OneRowRelation.select(1),
+ "cte2" -> table("cte1").select(star())))
+ intercept(
+ "with cte1 (select 1), cte1 as (select 1 from cte1) select * from
cte1",
+ "Name 'cte1' is used for multiple common table expressions")
+ }
+
+ test("simple select query") {
+ assertEqual("select 1", OneRowRelation.select(1))
+ assertEqual("select a, b", OneRowRelation.select('a, 'b))
+ assertEqual("select a, b from db.c", table("db", "c").select('a, 'b))
+ assertEqual("select a, b from db.c where x < 1", table("db",
"c").where('x < 1).select('a, 'b))
+ assertEqual("select a, b from db.c having x < 1", table("db",
"c").select('a, 'b).where('x < 1))
--- End diff --
Oh I see, so although the parser accepts this syntax, we must detect this
case in analyzer.
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