linxt20 opened a new pull request, #13244:
URL: https://github.com/apache/iotdb/pull/13244

   The main purpose of this work is to fix some known issues in scalar 
functions. 
   
   First, the support for timestamp data type in mathematical scalar functions 
has been removed, considering that the data type of timestamp does not have 
practical significance in the use of scalar functions. This part has made 
modifications to all mathematical scalar functions and also to the related IT.
   
   Secondly, support for the || symbol has been added, as the || symbol is 
semantically consistent with the concat function, so in astbuilder, || is 
treated as a function call for concat.
   
   Finally, for the return value types of upper, lower, and trim, they have 
been modified to return string instand of consistently with the input type, 
which is a modification made according to the actual application requirements.
   
   


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