clintropolis commented on code in PR #15455:
URL: https://github.com/apache/druid/pull/15455#discussion_r1410216564
##########
docs/querying/filters.md:
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@@ -450,6 +450,43 @@ Note that it is often more optimal to use a like filter
instead of a regex for s
{ "type": "regex", "dimension": "someColumn", "pattern": ^50.* }
```
+## Array contains element filter
+
+The `arrayContainsElement` filter is for checking if an `ARRAY` contains a
specific element, but can match against any type of column with scalar columns
being treated as single element arrays.
+
+| Property | Description | Required |
+| -------- | ----------- | -------- |
+| `type` | Must be "arrayContainsElement".| Yes |
+| `column` | Input column or virtual column name to filter. | Yes |
+| `elementMatchValueType` | String specifying the type of element value to
match. For example `STRING`, `LONG`, `DOUBLE`, `FLOAT`, `ARRAY<STRING>`,
`ARRAY<LONG>`, or any other Druid type. The `elementMatchValueType` determines
how Druid interprets the `elementMatchValue` to assist in converting to the
type of elements contained in the matched `column`. | Yes |
+| `elementMatchValue` | Array element value to match, including null. | Yes |
+
+### Example: equivalent of `WHERE ARRAY_CONTAINS(someArrayColumn, 'hello')`
Review Comment:
all of the other examples on this page are framed in terms of equivalent SQL
queries, am going to leave it as is
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