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https://issues.apache.org/jira/browse/HIVE-1545?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jonathan Chang updated HIVE-1545:
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Attachment: udfs.tar.gz
> Add a bunch of UDFs and UDAFs
> -----------------------------
>
> Key: HIVE-1545
> URL: https://issues.apache.org/jira/browse/HIVE-1545
> Project: Hadoop Hive
> Issue Type: New Feature
> Components: UDF
> Reporter: Jonathan Chang
> Assignee: Jonathan Chang
> Priority: Minor
> Attachments: udfs.tar.gz, udfs.tar.gz
>
>
> Here some UD(A)Fs which can be incorporated into the Hive distribution:
> UDFArgMax - Find the 0-indexed index of the largest argument. e.g., ARGMAX(4,
> 5, 3) returns 1.
> UDFBucket - Find the bucket in which the first argument belongs. e.g.,
> BUCKET(x, b_1, b_2, b_3, ...), will return the smallest i such that x > b_{i}
> but <= b_{i+1}. Returns 0 if x is smaller than all the buckets.
> UDFFindInArray - Finds the 1-index of the first element in the array given as
> the second argument. Returns 0 if not found. Returns NULL if either argument
> is NULL. E.g., FIND_IN_ARRAY(5, array(1,2,5)) will return 3. FIND_IN_ARRAY(5,
> array(1,2,3)) will return 0.
> UDFGreatCircleDist - Finds the great circle distance (in km) between two
> lat/long coordinates (in degrees).
> UDFLDA - Performs LDA inference on a vector given fixed topics.
> UDFNumberRows - Number successive rows starting from 1. Counter resets to 1
> whenever any of its parameters changes.
> UDFPmax - Finds the maximum of a set of columns. e.g., PMAX(4, 5, 3) returns
> 5.
> UDFRegexpExtractAll - Like REGEXP_EXTRACT except that it returns all matches
> in an array.
> UDFUnescape - Returns the string unescaped (using C/Java style unescaping).
> UDFWhich - Given a boolean array, return the indices which are TRUE.
> UDFJaccard
> UDAFCollect - Takes all the values associated with a row and converts it into
> a list. Make sure to have: set hive.map.aggr = false;
> UDAFCollectMap - Like collect except that it takes tuples and generates a map.
> UDAFEntropy - Compute the entropy of a column.
> UDAFPearson (BROKEN!!!) - Computes the pearson correlation between two
> columns.
> UDAFTop - TOP(KEY, VAL) - returns the KEY associated with the largest value
> of VAL.
> UDAFTopN (BROKEN!!!) - Like TOP except returns a list of the keys associated
> with the N (passed as the third parameter) largest values of VAL.
> UDAFHistogram
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