Hive

来源： https://stackoverflow.com/questions/58328872/variables-in-hiveql

来源： https://stackoverflow.com/questions/58328872/variables-in-hiveql

来源： https://stackoverflow.com/questions/61004914/how-to-config-java-spark-sparksession-samplesize

来源： https://stackoverflow.com/questions/56233795/custom-spark-does-not-find-hive-databases-when-running-on-yarn

来源： https://stackoverflow.com/questions/63001636/how-to-perform-self-join-with-same-row-of-previous-groupmonth-to-bring-in-addi

问题 I am trying to execute a simple select * from table limit 1; Statement in hive on an external table. But facing failue with execption: java.io.IOException:org.apache.avro.AvroTypeException: Found double, expecting union. Can Someone help me understand what this means? I have checked the schema file and the "default":null is already given. What is the exact reason for this exception occuring? I tried understanding an already existing discussion. The schema looks something like this: {"type":

问题 I am trying to execute a simple select * from table limit 1; Statement in hive on an external table. But facing failue with execption: java.io.IOException:org.apache.avro.AvroTypeException: Found double, expecting union. Can Someone help me understand what this means? I have checked the schema file and the "default":null is already given. What is the exact reason for this exception occuring? I tried understanding an already existing discussion. The schema looks something like this: {"type":

问题 I have defined a table on top of files present in hdfs. I am using the OpenCSV Serde to read from the file. But, '\' slash characters in the data are getting omitted in the final result set. Is there a hive serde property that I am not using correctly. As per the documentation, escapeChar = '\' should fix this problem. But, the problem persists. CREATE EXTERNAL TABLE `tsr`( `last_update_user` string COMMENT 'from deserializer', `last_update_datetime` string COMMENT 'from deserializer') ROW

问题 I have a table in Hive CREATE TABLE tab_data ( rec_id INT, rec_name STRING, rec_value DECIMAL(3,1), rec_created TIMESTAMP ) STORED AS PARQUET; and I want to populate this table with data in .csv files like these 10|customer1|10.0|2016-09-07 08:38:00.0 20|customer2|24.0|2016-09-08 10:45:00.0 30|customer3|35.0|2016-09-10 03:26:00.0 40|customer1|46.0|2016-09-11 08:38:00.0 50|customer2|55.0|2016-09-12 10:45:00.0 60|customer3|62.0|2016-09-13 03:26:00.0 70|customer1|72.0|2016-09-14 08:38:00.0 80

问题 Suppose my table looks something like: Col1 Col2 Col3.....Col20 Col21 Now I want to select all but Col21. I want to change it to unix_timestamp() before I insert into some other table. So the trivial approach is to do something like: INSERT INTO newtable partition(Col21) SELECT Col1, Col2, Col3.....Col20, unix_timestamp() AS Col21 FROM oldTable Is there a way I can achieve this in hive? Thanks a lot for your help! 回答1: Try to setup the below property set hive.support.quoted.identifiers=none;