It’s not about case when, but about rand(). Non-deterministic expressions are not allowed in join condition.
> On 13 Jul 2017, at 6:43 PM, wangshuang <cn_...@qq.com> wrote: > > I'm trying to execute hive sql on spark sql (Also on spark thriftserver), For > optimizing data skew, we use "case when" to handle null. > Simple sql as following: > > > SELECT a.col1 > FROM tbl1 a > LEFT OUTER JOIN tbl2 b > ON > * CASE > WHEN a.col2 IS NULL > TNEN cast(rand(9)*1000 - 9999999999 as string) > ELSE > a.col2 END * > = b.col3; > > > But I get the error: > > == Physical Plan == > *org.apache.spark.sql.AnalysisException: nondeterministic expressions are > only allowed in > Project, Filter, Aggregate or Window, found:* > (((CASE WHEN (a.`nav_tcdt` IS NULL) THEN CAST(((rand(9) * CAST(1000 AS > DOUBLE)) - CAST(9999999999L AS DOUBLE)) AS STRING) ELSE a.`nav_tcdt` END = > c.`site_categ_id`) AND (CAST(a.`nav_tcd` AS INT) = 9)) AND (c.`cur_flag` = > 1)) > in operator Join LeftOuter, (((CASE WHEN isnull(nav_tcdt#25) THEN > cast(((rand(9) * cast(1000 as double)) - cast(9999999999 as double)) as > string) ELSE nav_tcdt#25 END = site_categ_id#80) && (cast(nav_tcd#26 as int) > = 9)) && (cur_flag#77 = 1)) > ;; > GlobalLimit 10 > +- LocalLimit 10 > +- Aggregate [date_id#7, CASE WHEN (cast(city_id#10 as string) IN > (cast(19596 as string),cast(20134 as string),cast(10997 as string)) && > nav_tcdt#25 RLIKE ^[0-9]+$) THEN city_id#10 ELSE nav_tpa_id#21 END], > [date_id#7] > +- Filter (date_id#7 = 2017-07-12) > +- Join LeftOuter, (((CASE WHEN isnull(nav_tcdt#25) THEN > cast(((rand(9) * cast(1000 as double)) - cast(9999999999 as double)) as > string) ELSE nav_tcdt#25 END = site_categ_id#80) && (cast(nav_tcd#26 as int) > = 9)) && (cur_flag#77 = 1)) > :- SubqueryAlias a > : +- SubqueryAlias tmp_lifan_trfc_tpa_hive > : +- CatalogRelation `tmp`.`tmp_lifan_trfc_tpa_hive`, > org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe, [date_id#7, chanl_id#8L, > pltfm_id#9, city_id#10, sessn_id#11, gu_id#12, nav_refer_page_type_id#13, > nav_refer_page_value#14, nav_refer_tpa#15, nav_refer_tpa_id#16, > nav_refer_tpc#17, nav_refer_tpi#18, nav_page_type_id#19, nav_page_value#20, > nav_tpa_id#21, nav_tpa#22, nav_tpc#23, nav_tpi#24, nav_tcdt#25, nav_tcd#26, > nav_tci#27, nav_tce#28, detl_refer_page_type_id#29, > detl_refer_page_value#30, ... 33 more fields] > +- SubqueryAlias c > +- SubqueryAlias dim_site_categ_ext > +- CatalogRelation `dw`.`dim_site_categ_ext`, > org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe, [site_categ_skid#64L, > site_categ_type#65, site_categ_code#66, site_categ_name#67, > site_categ_parnt_skid#68L, site_categ_kywrd#69, leaf_flg#70L, sort_seq#71L, > site_categ_srch_name#72, vsbl_flg#73, delet_flag#74, etl_batch_id#75L, > updt_time#76, cur_flag#77, bkgrnd_categ_skid#78L, bkgrnd_categ_id#79L, > site_categ_id#80, site_categ_parnt_id#81] > > Does spark sql not support syntax "case when" in JOIN? Additional, my spark > version is 2.2.0. > Any help would be greatly appreciated. > > > > > -- > View this message in context: > http://apache-spark-developers-list.1001551.n3.nabble.com/SQL-Syntax-case-when-doesn-t-be-supported-in-JOIN-tp21953.html > Sent from the Apache Spark Developers List mailing list archive at Nabble.com. > > --------------------------------------------------------------------- > To unsubscribe e-mail: dev-unsubscr...@spark.apache.org > --------------------------------------------------------------------- To unsubscribe e-mail: dev-unsubscr...@spark.apache.org
