Github user chenghao-intel commented on a diff in the pull request:
https://github.com/apache/spark/pull/4918#discussion_r25918626
--- Diff: sql/core/src/test/scala/org/apache/spark/sql/SQLQuerySuite.scala
---
@@ -1049,4 +1049,14 @@ class SQLQuerySuite extends QueryTest with
BeforeAndAfterAll {
rdd.toDF().registerTempTable("distinctData")
checkAnswer(sql("SELECT COUNT(DISTINCT key,value) FROM distinctData"),
Row(2))
}
+
+ test("SPARK-6145: ORDER BY test for nested fields") {
+ jsonRDD(sparkContext.makeRDD(
+ """{"a": {"b": 1, "a": {"a": 1}}, "c": [{"d": 1}]}""" ::
Nil)).registerTempTable("nestedOrder")
+ // These should be successfully analyzed
+ sql("SELECT 1 FROM nestedOrder ORDER BY a.b").queryExecution.analyzed
+ sql("SELECT a.b FROM nestedOrder ORDER BY a.b").queryExecution.analyzed
+ sql("SELECT 1 FROM nestedOrder ORDER BY a.a.a").queryExecution.analyzed
+ sql("SELECT 1 FROM nestedOrder ORDER BY
c[0].d").queryExecution.analyzed
--- End diff --
BTW, In Hive
```
hive> select a.a from struct1 order by a.a;
FAILED: SemanticException [Error 10042]: Line 1:33 . Operator is only
supported on struct or list of struct types 'a'
hive> select 1 from struct1 order by a.a;
FAILED: SemanticException [Error 10004]: Line 1:31 Invalid table alias or
column reference 'a': (possible column names are: _c0)
hive> select _c0 from struct1 order by a.a;
FAILED: ParseException line 1:11 missing \' at 'from' near '<EOF>'
```
Seems Hive has bugs on this ambiguous attribute references, that's why I
think we probably need to change that code:
https://github.com/apache/spark/pull/4892/files#diff-27c76f96a7b2733ecfd6f46a1716e153R201
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