edgar2020 commented on code in PR #16878:
URL: https://github.com/apache/druid/pull/16878#discussion_r1715632988
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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`.
-**Function type:** [Scalar, string](sql-scalar.md#string-functions)
+* **Syntax:** `LOOKUP(expr, lookupName[, replaceMissingValueWith])`
+* **Function type:** Scalar, string
+
+<details><summary>Example</summary>
+
+The following example uses a map lookup table, named `acronym_to_name` made
with the following key-value pairs:
+
+```json
+{
+ “SJU”: Luis Munoz Marin International Airport”,
+ “IAD”: “Dulles International AirportDulles International Airport”
Review Comment:
- [x] Change tabs to spaces
- [x] Used non-stylized quotation marks
- [x] Add missing quotation marks for the first line
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