Github user jinfengni commented on a diff in the pull request:
https://github.com/apache/drill/pull/193#discussion_r45407282
--- Diff:
contrib/storage-hive/core/src/test/java/org/apache/drill/exec/hive/TestHiveStorage.java
---
@@ -42,6 +43,25 @@ public void hiveReadWithDb() throws Exception {
}
@Test
+ public void simpleLimitZero() throws Exception {
+ testBuilder()
+ .sqlQuery("select * from hive.kv limit 0")
+ .expectsEmptyResultSet()
+ .baselineColumns("key", "value")
+ .go();
+ }
+
+ @Test
+ public void simpleLimitZeroPlan() throws Exception {
+ final String[] expectedPlan = {
+ ".*Limit.*\n" +
+ ".*Values.*"
+ };
+ final String[] excludedPlan = {};
+ PlanTestBase.testPlanMatchingPatterns("select * from hive.kv limit 0",
expectedPlan, excludedPlan);
+ }
+
--- End diff --
Also, you may consider adding a negative test, such as "schemed limit 0",
but select clause has a function.
select substr(char_col, 1, 5) from hive.table limit 0;
In such case, I assume this patch would not do the short cut, and the
function return type is not known for now in Drill's planning time.
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