zhangboren93 opened a new issue, #4281:
URL: https://github.com/apache/carbondata/issues/4281
I found that reading carbon files from CarbonReader takes long time in
"SimpleDateFormat.<init>", see attached file for output of
profiling.
https://github.com/apache/carbondata/blob/4b8846d1e6737e7db8a96014818c067c8c253d1f/sdk/sdk/src/main/java/org/apache/carbondata/sdk/file/CarbonReader.java#L207
I wonder if it is OK if we add some lazy initialization to SimpleDateFormat
in the class, and if so should it support multi-threading.
[profile.zip](https://github.com/apache/carbondata/files/8954954/profile.zip)
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