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官方网址:
https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF#LanguageManualUDF-Built-inFunctions

Mathematical Functions

Collection Functions

Type Conversion Functions

Date Functions

Conditional Functions

String Functions

Built-in Aggregate Functions (UDAF)

Built-in XPathUDF / XML UDF

Built-in Table-Generating Functions (UDTF)

Data Masking Functions

Misc. Functions