Merge branch 'rightlib' into mergelibs-241120-1113

1 files changed, 38 insertions, 0 deletions

diff --git a/yql/essentials/tests/s-expressions/suites/Optimizers/FalattenByColumns.yql b/yql/essentials/tests/s-expressions/suites/Optimizers/FalattenByColumns.yql
new file mode 100644
index 0000000000..4a52d5d457
--- /dev/null
+++ b/yql/essentials/tests/s-expressions/suites/Optimizers/FalattenByColumns.yql
@@ -0,0 +1,38 @@
+(
+(import aggregate_module '"/lib/yql/aggregate.yql")
+(import window_module '"/lib/yql/window.yql")
+(let world (block '(
+  (let x (Read! world (DataSource '"yt" '"plato") (MrTableConcat (Key '('table (String '"Input")) '('view (String '"opt_struct")))) '('"b") '()))
+  (let world (Left! x))
+  (let table0 (Right! x))
+  (let output (block '(
+    (let select (block '(
+      (let core table0)
+      (let core (FlatMap core (lambda '(row) (block '(
+        (let res (FlattenByColumns row '('b 'bb)))
+        (return res)
+      )))))
+      (let core (FlatMap core (lambda '(row) (block '(
+        (let res (Struct))
+        (let res (AddMember res '"bb" (Member row '"bb")))
+        (let res (AsList res))
+        (return res)
+      )))))
+      (return core)
+    )))
+    (return select)
+  )))
+  (let world (block '(
+    (let result_sink (DataSink 'result))
+    (let world (Write! world result_sink (Key) output '('('type) '('autoref) '('columns '('"bb")))))
+    (return (Commit! world result_sink))
+  )))
+  (return world)
+)))
+(let world (block '(
+  (let plato_sink (DataSink '"yt" '"plato"))
+  (let world (Commit! world plato_sink))
+  (return world)
+)))
+(return world)
+)