LanguageManual UDF Skip to end of metadata Created by Confluence Administrator, last modified by Andrew Sherman on Oct 19, 2017 Go to start of metadata Hive Operators and User-Defined Functions (UDFs) Hive Operators and User-Defined Functions (UDFs) Built-in O…

对有特殊值的数据倾斜处理 SET mapred.reduce.tasks=20; SET hive.map.aggr=TRUE; SET hive.groupby.skewindata=TRUE; SET hive.optimize.skewjoin=TRUE;    set hive.auto.convert.join=false; INSERT OVERWRITE TABLE HIS_RFD_SYMID_RESULT PARTITION(tid='wcj01') SELECT aa.MAC,…