Github user sunjincheng121 commented on the issue:
https://github.com/apache/flink/pull/4127
Hi, @twalthr Thanks for your reviewing.
For performance reasons I have not using `String.format()`. I have a simple
test using `String.format()` and PR approach. run `100000` times. The result as
follows:
`str.concat(String.format("%" + (length - str.length()) + "s",
"").replace(" ", car));` : 1345ms
`The PR lpad` : 145ms. So I think we should not using `String.format()`.
Please tell me if there are any mistake.
Thanks, Jincheng
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