techdocsmith commented on code in PR #17658:
URL: https://github.com/apache/druid/pull/17658#discussion_r1942048189
##########
docs/querying/sql-functions.md:
##########
@@ -1282,22 +1282,75 @@ Returns the following:
## BLOOM_FILTER
-Computes a Bloom filter from values produced by the specified expression.
+Computes a [Bloom filter](../development/extensions-core/bloom-filter.md) from
values provided in an expression.
-* **Syntax**: `BLOOM_FILTER(expr, <NUMERIC>)`
+
+* **Syntax:** `BLOOM_FILTER(expr, numEntries)`
+ `numEntries` specifies the maximum number of distinct values before the
false positive rate increases.
* **Function type:** Aggregation
+<details><summary>Example</summary>
+
+The following example returns a Base64-encoded Bloom filter string for entries
in `agent_category`:
+
+```sql
+SELECT
+ agent_category,
+ BLOOM_FILTER(agent_category, 10) as bloom
+FROM "kttm"
+ GROUP BY agent_category
+```
+
+Returns the following:
+
+| `agent_keys` | `bloom` |
+| -- | -- |
+| `empty` |
`"BAAAAAgAAAAAABAAQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAEABAAAAAA"`
|
+| `Game console` |
`"BAAAAAgAAAAAAAAAAAAAAAAAAAAAAAAAQAgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAgBAAAAAAAAAAAAAAAA"`
|
+| `Personal computer` |
`"BAAAAAgAAAAAAEAAAAAAAAAAAAIAAAAAAAAAAAAAAAAAAAAAAAIAAAAAAAAAAAAAAAAAAAAAAAAAAQAAAAAAAAAAAAAA"`
|
+| `Smart TV` |
`"BAAAAAgAAAAAAAAAAAAAgAAAAgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAgAA"`
|
+| `Smartphone` |
`"BAAAAAgAAACAAAAAAAAAAAAAAEAAAAAAAAAAAAAAAAAAAAAAAAAIAAAAAAAAAAAAAAAAAAIAAAAAAAAAAAAAAAAAAAAA"`
|
+| `Tablet` |
`"BAAAAAgAAAAAAAAAAAAAAAIAAAAAAAAAAAAAAAAAAAAAAgAAAAAAAAAAAAAAAAAAAAACAAAAAAAAAAAAAAAAAAAAAAIA"`
|
+
Review Comment:
`````suggestion
The following example returns a Base64-encoded Bloom filter representing the
set of devices ,`agent_category`, used in Albania:
```sql
SELECT "country",
BLOOM_FILTER(agent_category, 10) as albanian_bloom
FROM "kttm"
WHERE "country" = 'Albania'
GROUP BY "country"
```
Returns the following:
|`country`| `albanian_bloom`|
|---| --- |
|`Albania`|`BAAAAAgAAACAAEAAAAAAAAAAAEIAAAAAAAAAAAAAAAAAAAAAAAIIAAAAAAAAAAAAAAAAAAIAAAAAAQAAAAAAAAAAAAAA`|
`````
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