[query] Improve _same to make exactly one pass over the data #13151
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This both avoids an extra pass to find the failing rows as well as avoiding a an extra pass if the globals depend on non-global data. In particular, this pipeline would run the column aggregations four times (IMO, at most twice is OK): ``` mt = hl.utils.range_matrix_table(2,2) mt = mt.annotate_entries(x = mt.row_idx * mt.col_idx) mt = mt.annotate_cols(mean_x = hl.agg.mean(mt.x)) mt = mt.annotate_entries(x = mt.x - mt.mean_x) mt._same(mt) ```
chrisvittal
approved these changes
Jun 7, 2023
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This both avoids an extra pass to find the failing rows as well as avoiding a an extra pass if the globals depend on non-global data. In particular, this pipeline would run the column aggregations four times (IMO, at most twice is OK):