[GitHub] [age] fatimafatimaprogrammer opened a new issue, #572: Scaler function "coalesce()" Syntax

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fatimafatimaprogrammer opened a new issue, #572:
URL: https://github.com/apache/age/issues/572

   I was going through the scaler functions and didn't get the syntax of this 
particular function **coalesce()** as in its syntax there are two arguments 
   first **expression** with opening square bracket **[**
   second **expression** with closing square bracket  **]** and asterick **"*"**
   
   
![image](https://user-images.githubusercontent.com/63642648/212546757-4b4cb5d0-fbe2-4ae9-84b0-eeeb04a2d7ad.png)
   
   Can someone please explain what does these two parameters refer to?? Are 
there actually 2 parameters or some other way of writting single expression 
parameter which i'm not getting.
   
   As in given example they are passing simple expression 
   
   
![image](https://user-images.githubusercontent.com/63642648/212546993-f37b6cbb-a9c3-4995-8c3f-b74f70e8b97a.png)
   
   


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