ClickHouse/dbms/tests/queries/bugs/low_cardinality_remove.sql

DROP TABLE IF EXISTS testView;
DROP TABLE IF EXISTS testTable;

CREATE TABLE IF NOT EXISTS testTable (
 A LowCardinality(String), -- like voter
 B Int64
) ENGINE MergeTree()
ORDER BY (A);

INSERT INTO testTable VALUES ('A', 1),('B',2),('C',3)

CREATE VIEW testView AS 
SELECT 
 A as ALow, -- like account
 B
FROM  
   testTable;

SELECT CAST(ALow, 'String') AS AStr
FROM testView
GROUP BY AStr;

DROP TABLE testTable;

CREATE TABLE IF NOT EXISTS testTable (
 A String, -- like voter
 B Int64
) ENGINE MergeTree()
ORDER BY (A);

SELECT CAST(ALow, 'String') AS AStr
FROM testView
GROUP BY AStr;

DROP TABLE IF EXISTS testView;
DROP TABLE IF EXISTS testTable;