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Joe McDonnell resolved IMPALA-11974. ------------------------------------ Fix Version/s: Impala 4.3.0 Assignee: Joe McDonnell Resolution: Fixed > Fix range/xrange/map/filter/ifilter/zip/izip issues regarding iterators being > lazy > ---------------------------------------------------------------------------------- > > Key: IMPALA-11974 > URL: https://issues.apache.org/jira/browse/IMPALA-11974 > Project: IMPALA > Issue Type: Sub-task > Components: Infrastructure > Affects Versions: Impala 4.3.0 > Reporter: Joe McDonnell > Assignee: Joe McDonnell > Priority: Major > Fix For: Impala 4.3.0 > > > Python 3 made map, range, zip, and filter lazy. That means that existing > Python code that relies on this turning into a list immediately need > adjustments: > {noformat} > # Python 2: > range(5) == [0,1,2,3,4] > True > # Python 3: > range(5) == [0,1,2,3,4] > False > # Python 3 fix: > list(range(5)) == [0,1,2,3,4] > True > # Same deal with map, zip, filter, etc.{noformat} > This example is basic, but this applies across the board. > Since the ordinary operators like range, filter, etc are now lazy, the old > lazy ones have been removed (xrange, ifilter, izip). Those need to be > replaced, and the future package provides implementations of range, zip, map, > filter, etc. > See: > [https://python-future.org/compatible_idioms.html#xrange] > [https://python-future.org/compatible_idioms.html#range] > [https://python-future.org/compatible_idioms.html#map] > [https://python-future.org/compatible_idioms.html#imap] > etc > This corresponds to these pylint checks: > xrange-builtin > range-builtin-not-iterating > map-builtin-not-iterating > zip-builtin-not-iterating > filter-builtin-not-iterating > reduce-builtin > deprecated-itertools-function > Futurize has some tools to help: > libfuturize.fixes.fix_xrange_with_import > lib2to3.fixes.fix_map > lib2to3.fixes.fix_filter -- This message was sent by Atlassian Jira (v8.20.10#820010) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-all-unsubscr...@impala.apache.org For additional commands, e-mail: issues-all-h...@impala.apache.org