[MCOL-4778] Return if we have an error in push_down_init. (#2420)

mysql-test/columnstore/bugfixes/mcol-4778.result

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+DROP DATABASE IF EXISTS mcol_4778;
+CREATE DATABASE mcol_4778;
+USE mcol_4778;
+CREATE TABLE bus_routes (origin varchar(50), dst varchar(50)) engine=columnstore;
+INSERT INTO bus_routes VALUES
+('New York', 'Boston'),
+('Boston', 'New York'),
+('New York', 'Washington'),
+('Washington', 'Boston'),
+('Washington', 'Raleigh');
+WITH RECURSIVE bus_dst as (
+SELECT origin as dst FROM bus_routes WHERE origin='New York'
+  UNION
+SELECT bus_routes.dst FROM bus_routes JOIN bus_dst ON bus_dst.dst = bus_routes.origin
+)
+SELECT * FROM bus_dst;
+ERROR 42000: The storage engine for the table doesn't support Recursive CTE
+DROP DATABASE mcol_4778;

mysql-test/columnstore/bugfixes/mcol-4778.test

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+#
+# MCOL-4778 Recursive CTE Crashing MariaDB - fix crash produce err.
+#
+-- source ../include/have_columnstore.inc
+
+--disable_warnings
+DROP DATABASE IF EXISTS mcol_4778;
+--enable_warnings
+CREATE DATABASE mcol_4778;
+USE mcol_4778;
+
+CREATE TABLE bus_routes (origin varchar(50), dst varchar(50)) engine=columnstore;
+
+INSERT INTO bus_routes VALUES
+  ('New York', 'Boston'),
+  ('Boston', 'New York'),
+  ('New York', 'Washington'),
+  ('Washington', 'Boston'),
+  ('Washington', 'Raleigh');
+
+--error ER_CHECK_NOT_IMPLEMENTED
+WITH RECURSIVE bus_dst as (
+    SELECT origin as dst FROM bus_routes WHERE origin='New York'
+  UNION
+    SELECT bus_routes.dst FROM bus_routes JOIN bus_dst ON bus_dst.dst = bus_routes.origin
+)
+SELECT * FROM bus_dst;
+
+DROP DATABASE mcol_4778;