GitHub user ykrips opened a pull request:
TAJO-1093: DateTimeFormat.to_char() is slower than SimpleDateFormat.form...
String.format function internally uses the regular expression in its implementation. Using regular expression is expensive to use.
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This closes #177
Author: Jihun Kang <email@example.com>
TAJO-1093: DateTimeFormat.to_char() is slower than SimpleDateFormat.format()