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Date format issue with spark sql

 If you have date format like  date_col 1/1/1978 0:00 6/6/1975 0:00 1/1/1978 0:00 1/1/1978 0:00 7/23/1988 0:00 1/1/1978 0:00 1/26/1961 0:00 3/3/1980 0:00 6/2/1984 0:00 1/2/1971 0:00 Solution : substring(TO_DATE(date_col ,'MM/dd/yy'),0,10) from table Result : 1978-01-01 1975-06-06 .. 1988-07-23 ..
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Hive Partition sub folders HIVE_UNION_SUBDIR_1,HIVE_UNION_SUBDIR_2,HIVE_UNION_SUBDIR_8

 Hive Partition have sub folders like HIVE_UNION_SUBDIR_1,HIVE_UNION_SUBDIR_2,HIVE_UNION_SUBDIR_3 Problem : When you use UNION ALL in query with Hive version 1.2.0 onward. UNION ALL will not supported and we have TEZ engine setup in hive-site.xml or hive configuration file which is responsible to create  sub folders like HIVE_UNION_SUBDIR_1 etc  on HDFS. When you use spark sql or other sql query to read Partition data then your resultant partition created with blank or 0 value. Solution: Please change the configuration file of hive and set below property. Its work for me in dataiku. hive.execution.engine=mr It will invoke Map Reduce process which will  bit slow to process the job but it will help to stop creating the extra sub folder on HDFS.  
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Dataiku and Dremio date difference

In dataiku you have applied to_date function to convert string to date datatype in SparkSQL and when query same dataset in dremio then you will difference of 1 day. Example -  In dataiku      SELECT  offer_date  FROM temp      Result :      2023-05-18T00:00:00.000Z Dremio :     SELECT  offer_date  FROM temp Result :      2023-05-17 08:00:00.000 Now you will find the difference of  1 day and 8 hours (sometime 16 hours)  between Dataiku and Dremio. Solutions:       This difference is due to time difference. In Dataiku we have  correct date to correct it Dremio please use TO_TIMESTAMP function to get correct date. Example : select TO_TIMESTAMP(offer_date, 'yyyy-mm-dd' ) as offer_date from temp
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