Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/20433#discussion_r165259575
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/parser/ExpressionParserSuite.scala
---
@@ -561,8 +561,11 @@ class ExpressionParserSuite extends PlanTest {
Literal(CalendarInterval.fromSingleUnitString(u, s))
}
- // Empty interval statement
- intercept("interval", "at least one time unit should be given for
interval literal")
--- End diff --
yea, antlr just throws an exception when hitting this case;
```
scala> sql("select cast('2018-01-12' as DATE) + 1 days").show
+---------------------------------------------------------------------------+
|CAST(CAST(CAST(2018-01-12 AS DATE) AS TIMESTAMP) + interval 1 days AS
DATE)|
+---------------------------------------------------------------------------+
|
2018-01-13|
+---------------------------------------------------------------------------+
scala> sql("select cast('2018-01-12' as DATE) + interval").show
org.apache.spark.sql.AnalysisException: cannot resolve '`interval`' given
input columns: []; line 1 pos 36;
'Project [unresolvedalias((cast(2018-01-12 as date) + 'interval), None)]
+- OneRowRelation
```
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