kasakrisz commented on a change in pull request #1810:
URL: https://github.com/apache/hive/pull/1810#discussion_r551761602
##########
File path: ql/src/test/queries/clientpositive/udf_trim.q
##########
@@ -1,2 +1,20 @@
DESCRIBE FUNCTION trim;
DESCRIBE FUNCTION EXTENDED trim;
+
+SELECT '"' || trim(' tech ') || '"';
+
+SELECT '"' || TRIM(' ' FROM ' tech ') || '"';
+
+SELECT '"' || TRIM(LEADING '0' FROM '000123') || '"';
+
+SELECT '"' || TRIM(TRAILING '1' FROM 'Tech1') || '"';
+
+SELECT '"' || TRIM(BOTH '1' FROM '123Tech111') || '"';
+
+SELECT '"' || ltrim(' tech ') || '"', '"' || rtrim(' tech ') || '"';
+
+SELECT '"' || lTRIM('0' FROM '000123') || '"', '"' || rTRIM('0' FROM
'000123') || '"';
+
+SELECT trim('000123', '0');
Review comment:
`null` cannot be passed as a parameter to `trim`. It works in Postgres
and Oracle but not supported in Hive.
The following was executed on master without this patch:
```
select trim(null);
org.apache.hadoop.hive.ql.parse.SemanticException: Line 6:7 Wrong arguments
'TOK_NULL': trim takes only STRING/CHAR/VARCHAR types. Found VOID
```
IMHO we can implement this in a follow-up patch.
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