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Review request for hive and John Pullokkaran. Repository: hive-git Description ------- Current version (Hive 0.14) does not support union (or union distinct). It only supports union all. In this patch, we try to add this new feature by rewriting union distinct to union all followed by group by. Diffs ----- ql/src/java/org/apache/hadoop/hive/ql/optimizer/optiq/translator/ASTConverter.java a217d70 ql/src/java/org/apache/hadoop/hive/ql/parse/HiveParser.g 4e98e9b ql/src/java/org/apache/hadoop/hive/ql/parse/QBExpr.java e923bca ql/src/java/org/apache/hadoop/hive/ql/parse/SemanticAnalyzer.java 1b60cbb ql/src/test/queries/clientpositive/unionDistinct_1.q PRE-CREATION ql/src/test/queries/clientpositive/unionDistinct_2.q PRE-CREATION ql/src/test/results/clientpositive/unionDistinct_1.q.out PRE-CREATION ql/src/test/results/clientpositive/unionDistinct_2.q.out PRE-CREATION Diff: https://reviews.apache.org/r/28797/diff/ Testing ------- Thanks, pengcheng xiong
