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ASF GitHub Bot commented on DRILL-7096: --------------------------------------- paul-rogers commented on issue #1829: DRILL-7096: Develop vector for canonical Map<K,V> URL: https://github.com/apache/drill/pull/1829#issuecomment-515719706 This PR has no unit tests. While I am sure that this particular developer got everything 100% correct, I do wonder if future developers might accidentally introduce bugs that will only be caught by users in production. Without unit tests, we are performing without a safety net. Reviews must execute tests in our heads since there is no code to do it for us. I realize that the consumer of this code really wants this commit in, and will worry about tests later. But, as an open source project, it is a good practice to require unit tests for all new and changed code. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org > Develop vector for canonical Map<K,V> > ------------------------------------- > > Key: DRILL-7096 > URL: https://issues.apache.org/jira/browse/DRILL-7096 > Project: Apache Drill > Issue Type: Sub-task > Reporter: Igor Guzenko > Assignee: Bohdan Kazydub > Priority: Major > Fix For: 1.17.0 > > > Canonical Map<K,V> datatype can be represented using combination of three > value vectors: > keysVector - vector for storing keys of each map > valuesVector - vector for storing values of each map > offsetsVector - vector for storing of start indexes of next each map > So it's not very hard to create such Map vector, but there is a major issue > with such map representation. It's hard to search maps values by key in such > vector, need to investigate some advanced techniques to make such search > efficient. Or find other more suitable options to represent map datatype in > world of vectors. > After question about maps, Apache Arrow developers responded that for Java > they don't have real Map vector, for now they just have logical Map type > definition where they define Map like: List< Struct<key:key_type, > value:value_type> >. So implementation of value vector would be useful for > Arrow too. -- This message was sent by Atlassian JIRA (v7.6.14#76016)