chucheng92 commented on code in PR #3642:
URL: https://github.com/apache/calcite/pull/3642#discussion_r1462668798


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site/_docs/reference.md:
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@@ -2859,7 +2859,7 @@ In the following:
 | b | TIME_DIFF(time, time2, timeUnit)               | Returns the whole 
number of *timeUnit* between *time* and *time2*
 | b | TIME_SUB(time, interval)                       | Returns the TIME value 
that is *interval* before *time*
 | b | TIME_TRUNC(time, timeUnit)                     | Truncates *time* to the 
granularity of *timeUnit*, rounding to the beginning of the unit
-| m o p | TO_CHAR(timestamp, format)                 | Converts *timestamp* to 
a string using the format *format*
+| m o p | TO_CHAR(timestamp, format)                 | Converts *timestamp* to 
a string using the format *format* [More 
details](https://www.postgresql.org/docs/16/functions-formatting.html#FUNCTIONS-FORMATTING-DATETIME-TABLE)

Review Comment:
   your commit/pr want to add a PG format for century. but here m/o/p means 
MySQL/Oracle/PG, why only have pg link (and why pg-16.0)? 
   If so, shall we add other links for other functions? we need to think about 
it. 
   
   Generally speaking, calcite does not explicitly add external links to each 
engine. This will destroy the format of the current reference.md. 
   
   



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