A view which access an information schema table seems to use another plan, than the query in its extend explain output (it scan's all databases)

CREATE VIEW v1 AS SELECT TABLE_SCHEMA, TABLE_NAME, COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS;

explain extended select column_name FROM v1 WHERE TABLE_SCHEMA="osm" AND TABLE_NAME="test";

extra: Using where; Open_frm_only; Scanned all databases

show warnings;
..
select `information_schema`.`COLUMNS`.`COLUMN_NAME` AS `COLUMN_NAME` from `INFORMATION_SCHEMA`.`COLUMNS` where ((`information_schema`.`COLUMNS`.`TABLE_SCHEMA` = 'osm') and (`information_schema`.`COLUMNS`.`TABLE_NAME` = 'test'))

explain select `information_schema`.`COLUMNS`.`COLUMN_NAME` AS `COLUMN_NAME` from `INFORMATION_SCHEMA`.`COLUMNS` where ((`information_schema`.`COLUMNS`.`TABLE_SCHEMA` = 'osm') and (`information_schema`.`COLUMNS`.`TABLE_NAME` = 'test'));

extra: Using where; Open_frm_only; Scanned 0 databases