Merge branch 'rightlib' into mergelibs-241120-1113

1 files changed, 39 insertions, 0 deletions

diff --git a/yql/essentials/tests/s-expressions/suites/ManyYamrOperations/CombineThenGroup.yql b/yql/essentials/tests/s-expressions/suites/ManyYamrOperations/CombineThenGroup.yql
new file mode 100644
index 0000000000..5a39b90887
--- /dev/null
+++ b/yql/essentials/tests/s-expressions/suites/ManyYamrOperations/CombineThenGroup.yql
@@ -0,0 +1,39 @@
+(
+  (let x (Read! world (DataSource '"yt" '"plato") (Key '('table (String '"Input"))) '('"key" '"subkey" '"value") '()))
+  (let world (Left! x))
+  (let table0 (Right! x))
+
+  (let preMap (lambda '(item) (Just item)))
+  (let keyExtractor (lambda '(item) (Member item 'key)))
+  (let init (lambda '(key item) (Member item 'value)))
+  (let update (lambda '(key item state) (Concat state (Member item 'value))))
+  (let finish (lambda '(key state) (block '(
+    (let s (Struct))
+    (let s (AddMember s 'key key))
+    (let s (AddMember s 'subkey (String '.)))
+    (let s (AddMember s 'value state))
+    (return (Just s))
+  ))))
+  (let combine (CombineByKey table0 preMap keyExtractor init update finish))
+
+  (let listHandler (lambda '(stream) (FlatMap stream (lambda '(pair) (block '(
+    (let key (Nth pair '0))
+    (let list (ForwardList (Nth pair '1)))
+    (let s (Struct))
+    (let s (AddMember s 'key key))
+    (let s (AddMember s 'subkey (String '.)))
+    (let value (Fold1 list
+      (lambda '(item) (Member item 'value)) 
+      (lambda '(item state) (Concat state (Member item 'value)))
+    ))
+    (let s (AddMember s 'value (Coalesce value (String '""))))
+    (let ret (AsList s))
+    (return ret)
+  ))))))
+  (let reducedTable (PartitionByKey combine keyExtractor (Void) (Void) listHandler))
+  (let mr_sink (DataSink 'yt (quote plato)))
+  (let world (Write! world mr_sink (Key '('table (String 'Output))) reducedTable '('('mode 'append))))
+  (let world (Commit! world mr_sink))
+
+  (return world)
+)