Preserve column names when casts are inserted in projects

CREATE TABLE B(id VARCHAR);
CREATE VIEW V1 AS SELECT id, 'x' as y FROM B;
CREATE VIEW V2 AS SELECT id, 'xx' as y FROM B;
CREATE VIEW U AS SELECT * FROM V1 UNION ALL SELECT * FROM V2;

    LogicalUnion(all=[true]), id = 187
      LogicalProject(id=[$0], EXPR$1=[CAST($1):VARCHAR(2) NOT NULL]), id = 182
        LogicalTableScan(table=[[schema, v1]]), id = 115
      LogicalProject(id=[$0], EXPR$1=[CAST($1):VARCHAR(2) NOT NULL]), id = 185
        LogicalTableScan(table=[[schema, v2]]), id = 118