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https://issues.apache.org/jira/browse/FLINK-6892?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16319977#comment-16319977
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ASF GitHub Bot commented on FLINK-6892:
---------------------------------------
Github user twalthr commented on a diff in the pull request:
https://github.com/apache/flink/pull/4127#discussion_r160629614
--- Diff:
flink-libraries/flink-table/src/test/scala/org/apache/flink/table/expressions/ScalarFunctionsTest.scala
---
@@ -352,6 +352,24 @@ class ScalarFunctionsTest extends ScalarTypesTestBase {
"Flink~~~~xx")
}
+ @Test
+ def testLpad(): Unit = {
+ testSqlApi("LPAD('hi',4,'??')", "??hi")
+ testSqlApi("LPAD('hi',1,'??')", "h")
+ testSqlApi("LPAD('',1,'??')", "?")
+ testSqlApi("LPAD('',30,'??')", "??????????????????????????????")
+ testSqlApi("LPAD('111',-2,'??')", "")
--- End diff --
Is `testSqlApi("LPAD('111',-2,'??')", "")` standard?
I just tested this with MySQL and it returns NULL
> Add L/RPAD supported in SQL
> ---------------------------
>
> Key: FLINK-6892
> URL: https://issues.apache.org/jira/browse/FLINK-6892
> Project: Flink
> Issue Type: Sub-task
> Components: Table API & SQL
> Affects Versions: 1.4.0
> Reporter: sunjincheng
> Assignee: sunjincheng
>
> L/RPAD(str,len,padstr) Returns the string str, left/right-padded with the
> string padstr to a length of len characters. If str is longer than len, the
> return value is shortened to len characters.
> * Syntax:
> LPAD(str,len,padstr)
> * Arguments
> **str: -
> **len: -
> **padstr: -
> * Return Types
> String
> * Example:
> LPAD('hi',4,'??') -> '??hi'
> LPAD('hi',1,'??') -> 'h'
> RPAD('hi',4,'??') -> 'hi??'
> RPAD('hi',1,'??') -> 'h'
> * See more:
> ** [MySQL|
> https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_lpad]
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