HIVE-1550 Implement DROP VIEW IF EXISTS. Note: I do not want to create the table if it doesn't exist. But when I enter into spark-shell env, I use hiveContext.hql("DROP TABLE IF EXISTS hivetesting"). DROP TABLE IF EXISTS hql.customer PURGE; Underlying data in HDFS will be purged directly and table cannot be restored. Resolved; is related to. Se provassimo a cancellare una tabella che non esiste e la variabile di configurazione di Hive hive.exec.drop.ignorenonexistent fosse impostata a false, verremmo respinti da un messaggio di errore. It is ok for me to do drop table command under hive shell environment. While dropping the table if the table does not exists then Hive throws an error. Regards, Naga Vemprala Hadoop Hive Tutorial-Usage of Hive Commands in HQL, Since the table being dropped does not exist in the first place, Hive throws an error, when we issue the command: DROP TABLE IF EXISTS Execute the following command : show tables in DB like 'TABLENAME' If the table exists, its name will be returned, otherwise nothing will be returned. DROP TABLE [IF EXISTS] [db_name. This chapter describes how to drop a table in Hive. The syntax of IF EXISTS is as follows: drop table if exists table_name hive – PURGE. It can be a normal table (stored in Metastore) or an external table (stored in local file system); Hive treats both in the same manner, irrespective of their types. When you drop a table from Hive Metastore, it removes the table/column data and their metadata. DROP TABLE Syntax DROP TABLE [IF EXISTS] table_name [PURGE]; DATABSE and SCHEMA can be used interchangeably in Hive as both refer to the same. Details. When you drop a table from Hive Metastore, it removes the table/column data and their metadata. hive> DROP DATABASE IF EXISTS userdb; While dropping the table if the table does not exists then Hive throws an error. This site uses Akismet to reduce spam. In Hive, CREATE DATABASE statement is used to create a Database, this takes an optional clause IF NOT EXISTS, using this option, it creates only when database not already exists. If we want the statement to succeed even if the table is not present then we need to use “IF EXISTS”. Rilascia partizione Drop partition ALTER TABLE table_name DROP [IF EXISTS] (PARTITION part_spec, ...) part_spec: : (part_col_name1=val1, part_col_name2=val2, ...) Eliminare una partizione da una tabella o da una vista. In this article, I am using DATABASE but you can use SCHEMA instead. XML Word Printable JSON. HIVE-6754 Inconsistent default for hive.exec.drop.ignorenonexistent. It can be a normal table (stored in Metastore) or an (1 reply) Hi, I've had a look through the Wiki but couldn't see anything- is there a good (performant) way to check whether a partition exists for a table? This operation is allowed only for tables created using the Hive format. As of now this is not possible in HIVE. If you are absolutely sure that the table needs to be permanently deleted then you can use PURGE. If you need to drop all tables then the easiest way is to drop the database . std_details table can be dropped by using the below DROP TABLE command. If the table already exists, delete it. JSON Column Type; Help needed: Can't drop or alter a table , but can create a new table and run queries; How to drop tables using regex? Appreciate any help. You can also manually update or drop a Hive partition directly on HDFS using Hadoop commands, if you do so you need to run the MSCK command to synch up HDFS files with Hive … If you want to learn more you can always refer cwiki.apache.org page confluence page. Drop Table Statement. When I am using DROP TABLE IF EXISTS in hive, it is not freeing the memory. Hive> DROP TABLE IF EXISTS std_db.std_details On the successful completion of the above statement, the table std_details will be dropped. If the table does exist, it is dropped; if it does not exist, the statement has no effect. When you delete a file/folder it is not removed permanently . The SQL DROP TABLE statement allows you to remove or delete a table from the SQL database. Impala "drop table" fails with Hive Metastore exception. Sure the data is not removed permanently le tabelle esterne archiviano solo la definizione tabella! Exists con drop table when I am using drop table if the table if EXISTS ` ;. 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