max(dir0) reading more columns than necessary

The below query started to fail from this commit : 3209886a8548eea4a2f74c059542672f8665b8d2

select max(dir0) from dfs.`/drill/testdata/bug/2016`;
Error: UNSUPPORTED_OPERATION ERROR: Streaming aggregate does not support schema changes

Fragment 0:0

[Error Id: b0060205-e9a6-428a-9803-7b4312b2c6f4 on qa-node190.qa.lab:31010] (state=,code=0)

The sub-folders contains files which do have schema change for one column "contributions" (int32 vs double). However prior to this commit we did not fail in the scenario. Log files and test data are attached