Github user arina-ielchiieva commented on a diff in the pull request:
https://github.com/apache/drill/pull/815#discussion_r111192811
--- Diff:
exec/java-exec/src/test/java/org/apache/drill/exec/expr/fn/impl/TestStringFunctions.java
---
@@ -273,4 +273,13 @@ public void testSplit() throws Exception {
.run();
}
+ @Test
+ public void testReverse() throws Exception {
+ testBuilder()
+ .sqlQuery("select reverse(reverse(n_comment)) words from
cp.`tpch/nation.parquet`")
+ .unOrdered()
+ .sqlBaselineQuery("select n_comment words from
cp.`tpch/nation.parquet`")
+ .build()
+ .run();
+ }
--- End diff --
Unfortunately this unit test does not ensure that reverse function works
correctly.
Let's replace this unit test with two unit tests:
1. test reverse result for one row like in `testSplit()` test.
2. test that reverse doesn't fail for table with several long varchars.
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