Ashutosh Chauhan, I studied the 4 failures. 2 out of the 4, vector_partition_diff_num_cols and vector_partition_diff_num_cols are probably due to Sergey's enable CBO patch (and the following Vikram's patch is not updated so that the column names are different). I run groupby3_map_multi_distinct.q and optimize_nullscan.q, both of them passed on my laptop. Thus, I think it is safe to check in. Laljo John Pullokkaran, please let us know if you have other opinions.