[KYLIN-5215] Fix Kylin pushdown query and Cube query is inconsistent

[gaogao110]

Fix columnMetas information returned by Kylin pushdown query and Cube query is inconsistent

Proposed changes

1. Delete toUpperCase from PushDownRunnerSparkImpl.executeQuery

columnMetas.add(new SelectedColumnMeta(false, false, false, false, nullable, true, Integer.MAX_VALUE, fieldList.get(i).getName().toUpperCase(Locale.ROOT), fieldList.get(i).getName().toUpperCase(Locale.ROOT), null, null, null, fieldList.get(i).getPrecision(), fieldList.get(i).getScale(), fieldList.get(i).getDataType(), fieldList.get(i).getDataTypeName(), false, false, false));

Checklist

• I have create an issue on Kylin's jira, and have described the bug/feature there in detail

[liyang-kylin]

Thx for the pr, will come back with more comments in a few days.

[liyang-kylin]

pending on design discussion in https://issues.apache.org/jira/projects/KYLIN/issues/KYLIN-5215