edgar2020 commented on code in PR #16878:
URL: https://github.com/apache/druid/pull/16878#discussion_r1715631437


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docs/querying/sql-functions.md:
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@@ -1077,11 +1077,42 @@ Calculates the base-10 of the numeric expression.
 
 ## LOOKUP
 
-`LOOKUP(<CHARACTER>, <CHARACTER>[, <CHARACTER>])`
+Look up `expr` in a registered [query-time lookup table](lookups.md) named 
`lookupName`. Returns `replaceMissingValueWith`, which defaults to `null`, when 
the `expr` is null or when the lookup does not contain a value for `expr`.

Review Comment:
   switched "value" -> "key"



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