morningman opened a new pull request #1177: Optimize json functions
URL: https://github.com/apache/incubator-doris/pull/1177
 
 
   1. get_json_xxx() now support using quoto to escape dot
   2. Implement json_path_prepare() function to preprocess json_path
   Performance of get_json_string() on 1000000 rows reduces from 2.27s to 0.27s
   
   ISSUE: #449 

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