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new 7862079 add minimal documentation for expression filters (#11045)
7862079 is described below
commit 786207995eedd177ed354e916c1d1721f53f9a71
Author: Cameron Teasdale <[email protected]>
AuthorDate: Wed Apr 7 19:58:28 2021 -0400
add minimal documentation for expression filters (#11045)
* add minimal documentation for expression filters
* Update docs/querying/filters.md
Co-authored-by: Clint Wylie <[email protected]>
* Update docs/querying/filters.md
Co-authored-by: sthetland <[email protected]>
* Update docs/querying/filters.md
Co-authored-by: Alejandro Lujan <[email protected]>
* Update docs/querying/filters.md
Co-authored-by: Alejandro Lujan <[email protected]>
Co-authored-by: Clint Wylie <[email protected]>
Co-authored-by: sthetland <[email protected]>
Co-authored-by: Alejandro Lujan <[email protected]>
---
docs/querying/filters.md | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/docs/querying/filters.md b/docs/querying/filters.md
index 4e8c17b..9811008 100644
--- a/docs/querying/filters.md
+++ b/docs/querying/filters.md
@@ -531,3 +531,18 @@ The true filter is a filter which matches all values. It
can be used to tempora
{ "type" : "true" }
```
+
+### Expression Filter
+The expression filter allows for the implementation of arbitrary conditions,
leveraging the Druid expression system.
+
+This filter allows for more flexibility, but it might be less performant than
a combination of the other filters on this page due to the fact that not all
filter optimizations are in place yet.
+
+```json
+
+{
+ "type" : "expression" ,
+ "expression" : "((product_type == 42) && (!is_deleted))"
+}
+```
+
+See the [Druid expression system](../misc/math-expr.md) for more details.
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