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[HIVE-1399] Nested UDAFs cause Hive Internal Error (NullPointerException) - Hive - [issue]
...This query does not make "real-world" sense, and I'm guessing it's not even supported by HQL/SQL, but I'm pretty sure that it shouldn't be causing an internal error with a NullPointerExcepti...
http://issues.apache.org/jira/browse/HIVE-1399    Author: Mayank Lahiri, 2012-12-09, 00:37
[HIVE-1372] New algorithm for variance() UDAF - Hive - [issue]
...A new algorithm for the UDAF that computes variance. This is pretty much a drop-in replacement for the current UDAF, and has two benefits: provably numerically stable (reference included in ...
http://issues.apache.org/jira/browse/HIVE-1372    Author: Mayank Lahiri, 2011-12-17, 00:03
[HIVE-1397] histogram() UDAF for a numerical column - Hive - [issue]
...A histogram() UDAF to generate an approximate histogram of a numerical (byte, short, double, long, etc.) column. The result is returned as a map of (x,y) histogram pairs, and can be plotted ...
http://issues.apache.org/jira/browse/HIVE-1397    Author: Mayank Lahiri, 2011-12-17, 00:03
[HIVE-1376] Simple UDAFs with more than 1 parameter crash on empty row query - Hive - [issue]
...Simple UDAFs with more than 1 parameter crash when the query returns no rows. Currently, this only seems to affect the percentile() UDAF where the second parameter is the percentile to be co...
http://issues.apache.org/jira/browse/HIVE-1376    Author: Mayank Lahiri, 2011-12-17, 00:01
[HIVE-1470] percentile_approx() fails with more than 1 reducer - Hive - [issue]
...The larger issue is that a UDAF that has variable return types needs two inner Evaluator classes. This patch fixes a NullPointerException bug that is only encountered when partial aggregatio...
http://issues.apache.org/jira/browse/HIVE-1470    Author: Mayank Lahiri, 2011-12-16, 23:59
[HIVE-1438] sentences() UDF for natural language tokenization - Hive - [issue]
...Create a generic UDF that tokenizes free-form natural language text into sentences and words for more advanced processing, while stripping unnecessary punctuation and being fully internation...
http://issues.apache.org/jira/browse/HIVE-1438    Author: Mayank Lahiri, 2011-12-16, 23:59
[HIVE-1481] ngrams() UDAF for estimating top-k n-gram frequencies - Hive - [issue]
...ngrams are fixed-length subsequences of a longer sequences. This patch will add a new ngrams() UDAF to heuristically estimate the top-k most frequent n-grams in a set of sequences.Example: t...
http://issues.apache.org/jira/browse/HIVE-1481    Author: Mayank Lahiri, 2011-12-16, 23:59
[HIVE-1518] context_ngrams() UDAF for estimating top-k contextual n-grams - Hive - [issue]
...Create a new context_ngrams() function that generalizes the ngrams() UDAF to allow the user to specify context around n-grams. The analogy is "fill-in-the-blanks", and is best illustrated wi...
http://issues.apache.org/jira/browse/HIVE-1518    Author: Mayank Lahiri, 2011-12-16, 23:59
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