add nested key example to readme

Signed-off-by: Hendrik Saly <hendrik.saly@eliatra.com>
opensearch-project · Aug 29, 2024 · 74fe1cc · 74fe1cc
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commit 74fe1cc
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diff --git a/ppl-spark-integration/README.md b/ppl-spark-integration/README.md
@@ -230,6 +230,7 @@ See the next samples of PPL queries :
 **Fields**
  - `source = table`
  - `source = table | fields a,b,c`
+ - `source = table | fields level1.level2.leaf` (nested key)
 
 **Nested-Fields**
  - `source = catalog.schema.table1, catalog.schema.table2 | fields A.nested1, B.nested1`