Github user decibel commented on a diff in the pull request: https://github.com/apache/incubator-madlib/pull/29#discussion_r57410192 --- Diff: src/ports/postgres/modules/utilities/path.py_in --- @@ -108,8 +107,11 @@ def path(schema_madlib, source_table, output_table, partition_expr, *, nextval('{seq_gen}') AS {id_col_name}, --- End diff -- What are you basing that on? I don't believe there's any significant performance benefit to sequences over row_number() (actually, a quick glance at the code leads me to think sequences will be slower). On top of that, creating a sequence adds to catalog bloat (not to mention the cost of creating and then dropping the sequence).
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