LanguageManual UDF - Apache Hive - Apache Software Foundation

When hive.cache.expr.evaluation is set to true (which is the default) a UDF can give incorrect results if it is nested in another UDF or a Hive function. This bug affects releases 0.12.0, 0.13.0, and 0.13.1. Release 0.14.0 fixed the bug (HIVE-7314). The problem relates to the UDF's implementation of the getDisplayString method, as discussed in the Hive user mailing list.

[tuki0918]

“A REGEXP BstringsSame as RLIKE.”

[wlbhiro]

UNIXTIME to Dateはできる。 UNIX_TIMESTAMP(TO_UTC_TIMESTAMP(FROM_UNIXTIME(time), 'JST')) とかもできる。

[t_marcus87]

HadoopHiveのビルトインUDFとユーザ定義UDF

[kenta1984]

Hive User Defined Functions