org.apache.hadoop.hive.ql.udf.generic (Hive 1.2.2 API)

Interface Summary
Interface	Description
Collector	Collector gets data from a source.
GenericUDAFEvaluator.AggregationBuffer	Deprecated use `GenericUDAFEvaluator.AbstractAggregationBuffer` instead
GenericUDAFParameterInfo	A callback interface used in conjunction with `GenericUDAFResolver2` interface that allows for a more extensible and flexible means of discovering the parameter types provided for UDAF invocation.
GenericUDAFResolver	Deprecated Use `GenericUDAFResolver2` instead.
GenericUDAFResolver2	This interface extends the `GenericUDAFResolver` interface and provides more flexibility in terms of discovering the parameter types supplied to the UDAF.
GenericUDF.DeferredObject	A Defered Object allows us to do lazy-evaluation and short-circuiting.
ISupportStreamingModeForWindowing	A GenericUDAF mode that provides it results as a List to the `WindowingTableFunction` (so it is a `WindowFunctionInfo.isPivotResult()` return true) may support this interface.

Class Summary
Class	Description
AbstractGenericUDAFResolver	An abstract class to help facilitate existing implementations of `GenericUDAFResolver` to migrate towards the newly introduced interface `GenericUDAFResolver2`.
AbstractGenericUDFEWAHBitmapBop	An abstract class for a UDF that performs a binary operation between two EWAH-compressed bitmaps.
AbstractGenericUDFReflect	common class for reflective UDFs
DecimalNumDistinctValueEstimator
DoubleNumDistinctValueEstimator
GenericUDAFAverage	GenericUDAFAverage.
GenericUDAFAverage.AbstractGenericUDAFAverageEvaluator<TYPE>
GenericUDAFAverage.GenericUDAFAverageEvaluatorDecimal
GenericUDAFAverage.GenericUDAFAverageEvaluatorDouble
GenericUDAFBridge	This class is a bridge between GenericUDAF and UDAF.
GenericUDAFBridge.GenericUDAFBridgeEvaluator	GenericUDAFBridgeEvaluator.
GenericUDAFCollectList
GenericUDAFCollectSet	GenericUDAFCollectSet
GenericUDAFComputeStats	GenericUDAFComputeStats
GenericUDAFComputeStats.GenericUDAFBinaryStatsEvaluator	GenericUDAFBinaryStatsEvaluator.
GenericUDAFComputeStats.GenericUDAFBinaryStatsEvaluator.BinaryStatsAgg
GenericUDAFComputeStats.GenericUDAFBooleanStatsEvaluator	GenericUDAFBooleanStatsEvaluator.
GenericUDAFComputeStats.GenericUDAFBooleanStatsEvaluator.BooleanStatsAgg
GenericUDAFComputeStats.GenericUDAFDateStatsEvaluator	GenericUDAFDateStatsEvaluator High/low value will be saved in stats DB as long value representing days since epoch.
GenericUDAFComputeStats.GenericUDAFDecimalStatsEvaluator
GenericUDAFComputeStats.GenericUDAFDoubleStatsEvaluator	GenericUDAFDoubleStatsEvaluator.
GenericUDAFComputeStats.GenericUDAFLongStatsEvaluator	GenericUDAFLongStatsEvaluator.
GenericUDAFComputeStats.GenericUDAFNumericStatsEvaluator<V,OI extends ObjectInspector>
GenericUDAFComputeStats.GenericUDAFStringStatsEvaluator	GenericUDAFStringStatsEvaluator.
GenericUDAFComputeStats.GenericUDAFStringStatsEvaluator.StringStatsAgg
GenericUDAFContextNGrams	Estimates the top-k contextual n-grams in arbitrary sequential data using a heuristic.
GenericUDAFContextNGrams.GenericUDAFContextNGramEvaluator	A constant-space heuristic to estimate the top-k contextual n-grams.
GenericUDAFCorrelation	Compute the Pearson correlation coefficient corr(x, y), using the following stable one-pass method, based on: "Formulas for Robust, One-Pass Parallel Computation of Covariances and Arbitrary-Order Statistical Moments", Philippe Pebay, Sandia Labs and "The Art of Computer Programming, volume 2: Seminumerical Algorithms", Donald Knuth.
GenericUDAFCorrelation.GenericUDAFCorrelationEvaluator	Evaluate the Pearson correlation coefficient using a stable one-pass algorithm, based on work by Philippe Pébay and Donald Knuth.
GenericUDAFCount	This class implements the COUNT aggregation function as in SQL.
GenericUDAFCount.GenericUDAFCountEvaluator	GenericUDAFCountEvaluator.
GenericUDAFCovariance	Compute the covariance covar_pop(x, y), using the following one-pass method (ref.
GenericUDAFCovariance.GenericUDAFCovarianceEvaluator	Evaluate the variance using the algorithm described in http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance, presumably by Pébay, Philippe (2008), in "Formulas for Robust, One-Pass Parallel Computation of Covariances and Arbitrary-Order Statistical Moments", Technical Report SAND2008-6212, Sandia National Laboratories, http://infoserve.sandia.gov/sand_doc/2008/086212.pdf Incremental: n : mx_n = mx_(n-1) + [x_n - mx_(n-1)]/n : my_n = my_(n-1) + [y_n - my_(n-1)]/n : c_n = c_(n-1) + (x_n - mx_(n-1))(y_n - my_n) : Merge: c_X = c_A + c_B + (mx_A - mx_B)(my_A - my_B)n_An_B/n_X This one-pass algorithm is stable.
GenericUDAFCovarianceSample	Compute the sample covariance by extending GenericUDAFCovariance and overriding the terminate() method of the evaluator.
GenericUDAFCovarianceSample.GenericUDAFCovarianceSampleEvaluator	Compute the sample covariance by extending GenericUDAFCovarianceEvaluator and overriding the terminate() method of the evaluator.
GenericUDAFCumeDist
GenericUDAFCumeDist.GenericUDAFCumeDistEvaluator
GenericUDAFDenseRank
GenericUDAFDenseRank.GenericUDAFDenseRankEvaluator
GenericUDAFEvaluator	A Generic User-defined aggregation function (GenericUDAF) for the use with Hive.
GenericUDAFEvaluator.AbstractAggregationBuffer
GenericUDAFEWAHBitmap	GenericUDAFEWAHBitmap.
GenericUDAFEWAHBitmap.GenericUDAFEWAHBitmapEvaluator
GenericUDAFFirstValue
GenericUDAFFirstValue.GenericUDAFFirstValueEvaluator
GenericUDAFHistogramNumeric	Computes an approximate histogram of a numerical column using a user-specified number of bins.
GenericUDAFHistogramNumeric.GenericUDAFHistogramNumericEvaluator	Construct a histogram using an algorithm described by Ben-Haim and Tom-Tov.
GenericUDAFLag
GenericUDAFLag.GenericUDAFLagEvaluator
GenericUDAFLastValue
GenericUDAFLastValue.GenericUDAFLastValueEvaluator
GenericUDAFLead
GenericUDAFLead.GenericUDAFLeadEvaluator
GenericUDAFLeadLag	abstract class for Lead & lag UDAFs GenericUDAFLeadLag.
GenericUDAFLeadLag.GenericUDAFLeadLagEvaluator
GenericUDAFMax
GenericUDAFMax.GenericUDAFMaxEvaluator
GenericUDAFMin
GenericUDAFMin.GenericUDAFMinEvaluator
GenericUDAFMkCollectionEvaluator
GenericUDAFnGrams	Estimates the top-k n-grams in arbitrary sequential data using a heuristic.
GenericUDAFnGrams.GenericUDAFnGramEvaluator	A constant-space heuristic to estimate the top-k n-grams.
GenericUDAFNTile
GenericUDAFNTile.GenericUDAFNTileEvaluator
GenericUDAFPercentileApprox	Computes an approximate percentile (quantile) from an approximate histogram, for very large numbers of rows where the regular percentile() UDAF might run out of memory.
GenericUDAFPercentileApprox.GenericUDAFMultiplePercentileApproxEvaluator
GenericUDAFPercentileApprox.GenericUDAFPercentileApproxEvaluator	Construct a histogram using the algorithm described by Ben-Haim and Tom-Tov, and then use it to compute an approximate percentile value.
GenericUDAFPercentileApprox.GenericUDAFSinglePercentileApproxEvaluator
GenericUDAFPercentRank
GenericUDAFPercentRank.GenericUDAFPercentRankEvaluator
GenericUDAFRank
GenericUDAFRank.GenericUDAFAbstractRankEvaluator
GenericUDAFRank.GenericUDAFRankEvaluator
GenericUDAFRowNumber
GenericUDAFRowNumber.GenericUDAFRowNumberEvaluator
GenericUDAFStd	Compute the standard deviation by extending GenericUDAFVariance and overriding the terminate() method of the evaluator.
GenericUDAFStd.GenericUDAFStdEvaluator	Compute the standard deviation by extending GenericUDAFVarianceEvaluator and overriding the terminate() method of the evaluator.
GenericUDAFStdSample	Compute the sample standard deviation by extending GenericUDAFVariance and overriding the terminate() method of the evaluator.
GenericUDAFStdSample.GenericUDAFStdSampleEvaluator	Compute the sample standard deviation by extending GenericUDAFVarianceEvaluator and overriding the terminate() method of the evaluator.
GenericUDAFStreamingEvaluator<T1>
GenericUDAFStreamingEvaluator.SumAvgEnhancer<T1,T2>
GenericUDAFSum	GenericUDAFSum.
GenericUDAFSum.GenericUDAFSumDouble	GenericUDAFSumDouble.
GenericUDAFSum.GenericUDAFSumHiveDecimal	GenericUDAFSumHiveDecimal.
GenericUDAFSum.GenericUDAFSumLong	GenericUDAFSumLong.
GenericUDAFVariance	Compute the variance.
GenericUDAFVariance.GenericUDAFVarianceEvaluator	Evaluate the variance using the algorithm described by Chan, Golub, and LeVeque in "Algorithms for computing the sample variance: analysis and recommendations" The American Statistician, 37 (1983) pp.
GenericUDAFVarianceSample	Compute the sample variance by extending GenericUDAFVariance and overriding the terminate() method of the evaluator.
GenericUDAFVarianceSample.GenericUDAFVarianceSampleEvaluator	Compute the sample variance by extending GenericUDAFVarianceEvaluator and overriding the terminate() method of the evaluator.
GenericUDF	A Generic User-defined function (GenericUDF) for the use with Hive.
GenericUDF.DeferredJavaObject	A basic dummy implementation of DeferredObject which just stores a Java Object reference.
GenericUDFAbs	GenericUDFAbs.
GenericUDFAddMonths	GenericUDFAddMonths.
GenericUDFArray	GenericUDFArray.
GenericUDFArrayContains	GenericUDFArrayContains.
GenericUDFAssertTrue	GenericUDFAssertTrue
GenericUDFBaseArithmetic	Wrapper UDF that will instantiate the proper arithmetic UDF (numeric, date, etc) depending on the argument types
GenericUDFBaseBinary	Base class for binary operators, overrides getDisplayString()
GenericUDFBaseCompare	GenericUDF Base Class for operations.
GenericUDFBaseDTI
GenericUDFBaseNumeric	GenericUDF Base Class for operations.
GenericUDFBasePad
GenericUDFBaseTrim
GenericUDFBaseUnary
GenericUDFBetween
GenericUDFBridge	GenericUDFBridge encapsulates UDF to provide the same interface as GenericUDF.
GenericUDFCase	GenericUDF Class for SQL construct "CASE a WHEN b THEN c [ELSE f] END".
GenericUDFCbrt	GenericUDFCbrt.
GenericUDFCeil
GenericUDFCoalesce	GenericUDF Class for SQL construct "COALESCE(a, b, c)".
GenericUDFConcat	GenericUDFConcat.
GenericUDFConcatWS	Generic UDF for string function `CONCAT_WS(sep, [string \| array(string)]+).`
GenericUDFCurrentDate
GenericUDFCurrentTimestamp
GenericUDFCurrentUser
GenericUDFDate	UDFDate.
GenericUDFDateAdd	UDFDateAdd.
GenericUDFDateDiff	UDFDateDiff.
GenericUDFDateFormat	GenericUDFDateFormat.
GenericUDFDateSub	UDFDateSub.
GenericUDFDecode
GenericUDFElt	Generic UDF for string function `ELT(N,str1,str2,str3,...)`.
GenericUDFEncode
GenericUDFEWAHBitmapAnd	GenericEWAHUDFBitmapAnd.
GenericUDFEWAHBitmapEmpty
GenericUDFEWAHBitmapOr	GenericUDFEWAHBitmapOr.
GenericUDFFactorial	GenericUDFFactorial
GenericUDFField	GenericUDFField.
GenericUDFFloor
GenericUDFFloorCeilBase
GenericUDFFormatNumber	Generic UDF for format_number function `FORMAT_NUMBER(X, D)`.
GenericUDFFromUtcTimestamp
GenericUDFGreatest	GenericUDF Class for SQL construct "greatest(v1, v2, ..
GenericUDFHash	GenericUDF Class for computing hash values.
GenericUDFIf	IF(expr1,expr2,expr3) If expr1 is TRUE (expr1 <> 0 and expr1 <> NULL) then IF() returns expr2; otherwise it returns expr3.
GenericUDFIn	GenericUDFIn Example usage: SELECT key FROM src WHERE key IN ("238", "1"); From MySQL page on IN(): To comply with the SQL standard, IN returns NULL not only if the expression on the left hand side is NULL, but also if no match is found in the list and one of the expressions in the list is NULL.
GenericUDFIndex	GenericUDFIndex.
GenericUDFInFile	IN_FILE(str, filename) returns true if 'str' appears in the file specified by 'filename'.
GenericUDFInitCap	UDFInitCap.
GenericUDFInstr	Generic UDF for string function `INSTR(str,substr)`.
GenericUDFLag
GenericUDFLastDay	GenericUDFLastDay.
GenericUDFLead
GenericUDFLeadLag
GenericUDFLeast	GenericUDF Class for SQL construct "least(v1, v2, ..
GenericUDFLevenshtein	GenericUDFLevenshtein.
GenericUDFLocate	Generic UDF for string function `LOCATE(substr, str)`, `LOCATE(substr, str, start)`.
GenericUDFLower	UDFLower.
GenericUDFLpad	UDFLpad.
GenericUDFLTrim	UDFLTrim.
GenericUDFMacro	GenericUDFMacro wraps a user-defined macro expression into a GenericUDF interface.
GenericUDFMap	GenericUDFMap.
GenericUDFMapKeys	GenericUDFMapKeys.
GenericUDFMapValues	GenericUDFMapValues.
GenericUDFMonthsBetween	UDFMonthsBetween.
GenericUDFNamedStruct
GenericUDFNextDay	GenericUDFNextDay.
GenericUDFNvl
GenericUDFOPAnd	GenericUDF Class for computing and.
GenericUDFOPDivide	Note that in SQL, the return type of divide is not necessarily the same as the parameters.
GenericUDFOPDTIMinus
GenericUDFOPDTIPlus
GenericUDFOPEqual	GenericUDF Class for operation EQUAL.
GenericUDFOPEqualNS
GenericUDFOPEqualOrGreaterThan	GenericUDF Class for operation EqualOrGreaterThan.
GenericUDFOPEqualOrLessThan	GenericUDF Class for operation EqualOrLessThan.
GenericUDFOPGreaterThan	GenericUDF Class for operation GreaterThan.
GenericUDFOPLessThan	GenericUDF Class for operation LessThan.
GenericUDFOPMinus
GenericUDFOPMod
GenericUDFOPMultiply
GenericUDFOPNegative
GenericUDFOPNot	GenericUDFOPNot.
GenericUDFOPNotEqual	GenericUDF Class for operation Not EQUAL.
GenericUDFOPNotNull	GenericUDFOPNotNull.
GenericUDFOPNull	GenericUDFOPNull.
GenericUDFOPNumericMinus
GenericUDFOPNumericPlus	The reason that we list evaluate methods with all numeric types is for both better performance and type checking (so we know int + int is still an int instead of a double); otherwise a single method that takes (Number a, Number b) and use a.doubleValue() == b.doubleValue() is enough.
GenericUDFOPOr	GenericUDF Class for computing or.
GenericUDFOPPlus	The reason that we list evaluate methods with all numeric types is for both better performance and type checking (so we know int + int is still an int instead of a double); otherwise a single method that takes (Number a, Number b) and use a.doubleValue() == b.doubleValue() is enough.
GenericUDFOPPositive
GenericUDFPosMod	class for computing positive modulo.
GenericUDFPower
GenericUDFPrintf	Generic UDF for printf function `printf(String format, Obj...`
GenericUDFReflect	A simple generic udf to call java static functions via reflection.
GenericUDFReflect2	A simple generic udf to call java functions via reflection.
GenericUDFRound	Note: rounding function permits rounding off integer digits in decimal numbers, which essentially downgrades the scale to negative territory.
GenericUDFRpad	UDFRpad.
GenericUDFRTrim	UDFRTrim.
GenericUDFSentences	GenericUDFSentences: splits a natural language chunk of text into sentences and words.
GenericUDFSize	GenericUDFSize.
GenericUDFSortArray	Generic UDF for array sort `SORT_ARRAY(array(obj1, obj2, obj3...))`.
GenericUDFSoundex	GenericUDFSoundex.
GenericUDFSplit	GenericUDFSplit.
GenericUDFStringToMap	GenericUDFStringToMap.
GenericUDFStruct
GenericUDFTimestamp	GenericUDFTimestamp Example usage: ...
GenericUDFToBinary
GenericUDFToChar
GenericUDFToDate	GenericUDFToDate
GenericUDFToDecimal
GenericUDFToIntervalDayTime	GenericUDFIntervalDayTime Example usage: ...
GenericUDFToIntervalYearMonth	GenericUDFIntervalYearMonth Example usage: ...
GenericUDFToUnixTimeStamp	deterministic version of UDFUnixTimeStamp.
GenericUDFToUtcTimestamp
GenericUDFToVarchar
GenericUDFTranslate	TRANSLATE(string input, string from, string to) is an equivalent function to translate in PostGresSQL.
GenericUDFTrim	UDFTrim.
GenericUDFTrunc	GenericUDFTrunc.
GenericUDFUnion
GenericUDFUnixTimeStamp
GenericUDFUpper	UDFUpper.
GenericUDFUtils	Util functions for GenericUDF classes.
GenericUDFUtils.ConversionHelper	Convert parameters for the method if needed.
GenericUDFUtils.ReturnObjectInspectorResolver	This class helps to find the return ObjectInspector for a GenericUDF.
GenericUDFUtils.StringHelper	Helper class for UDFs returning string/varchar/char
GenericUDFWhen	GenericUDF Class for SQL construct "CASE WHEN a THEN b WHEN c THEN d [ELSE f] END".
GenericUDTF	A Generic User-defined Table Generating Function (UDTF) Generates a variable number of output rows for a single input row.
GenericUDTFExplode	GenericUDTFExplode.
GenericUDTFInline
GenericUDTFJSONTuple	GenericUDTFJSONTuple: this
GenericUDTFParseUrlTuple	GenericUDTFParseUrlTuple: this
GenericUDTFPosExplode	PosExplode.
GenericUDTFStack	Takes a row of size k of data and splits it into n rows of data.
LongNumDistinctValueEstimator
NGramEstimator	A generic, re-usable n-gram estimation class that supports partial aggregations.
NumDistinctValueEstimator
NumericHistogram	A generic, re-usable histogram class that supports partial aggregations.
RoundUtils	Utility class for generic round UDF.
SimpleGenericUDAFParameterInfo	A simple implementation of `GenericUDAFParameterInfo`.
StringNumDistinctValueEstimator
UDFCurrentDB
UDTFCollector	UDTFCollector collects data from a GenericUDTF and passes the data to a UDTFOperator.

Enum Summary
Enum Description

GenericUDAFEvaluator.Mode
Mode.

GenericUDFBaseCompare.CompareType

GenericUDFNextDay.DayOfWeek
Annotation Types Summary
Annotation Type Description

GenericUDAFEvaluator.AggregationType

Enum Summary
Enum	Description
GenericUDAFEvaluator.Mode	Mode.
GenericUDFBaseCompare.CompareType
GenericUDFNextDay.DayOfWeek

Annotation Types Summary
Annotation Type	Description
GenericUDAFEvaluator.AggregationType

Package org.apache.hadoop.hive.ql.udf.generic Description

Standard toolkit and framework for generic User-defined functions.