Partition exists and drop partition command works fine in Hive shell. Dynamic partition is a single insert to the partition table. ALTER TABLE some_table DROP IF EXISTS PARTITION(year = 2012); This command will remove the data and metadata for this partition. Partitioning is defined when the table is created. You can use ALTER TABLE with DROP PARTITION option to drop a partition for a table. Adds a partition to the partitioned table. Syntax. how to drop partition metadata from hive, when partition is drop by using alter drop command. In the last few articles, we have covered most of the details of Partitioning in Hive. CREATE TABLE test (col1 string) PARTITIONED BY (p1 int) ROW FORMAT DELIMITED FIELDS TERMINATED BY '\001' STORED AS TEXTFILE; INSERT OVERWRITE TABLE test PARTITION (p1) SELECT code, IF(salary > 60000, 100, null) as p1 FROM default.sample_07; hive> SHOW PARTITIONS test; OK p1=100 p1=__HIVE_DEFAULT_PARTITION__ Time taken: 0.124 seconds, Fetched: 2 row(s) hive> ALTER TABLE test DROP partition … However, in Big SQL the result from a SELECT with the same column definition and the same NULL data appears as NULL.. You can change the comment of the column and reorder columns. Use nvl() function in Hive to replace all NULL values of a column with a default value, In this article, I will explain with an example. More on that here It is a way of dividing a table into related parts based on the values of partitioned columns such as date, city, and dep When you define a table in Hive with a partitioning column of type STRING, all NULL values within the partitioning column appear as __HIVE_DEFAULT_PARTITION__ in the output of a SELECT from Hive statement. hive> ALTER TABLE sales drop if exists partition (year = 2020, quarter = 1), partition (year = 2020, quarter = 2); Here is how we dynamically pick partitions to drop. Drop or Delete Hive Partition. Hive - Partitioning - Hive organizes tables into partitions. We currently have an external table with a Hive Partition that I am unable to drop via. I had 3 partition and then issued hive drop partition command and it got succeeded. hive> show partitions spark_2_test; Partitioning is one of the important topics in the Hive. You can use this function to Replace all NULL values with -1 or 0 or any number for the integer column. ... (Hive syntax) Changes a column definition of an existing table. We don’t need explicitly to create the partition over the table for which we need to do the dynamic partition. You remove one of the partition directories on the file system. ADD AND DROP PARTITION. hadoop,apache-hive. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. If you need these to be dynamic then you can use ' --hivevar date1=xxxxx ' for it. ADD PARTITION. The MSCK REPAIR TABLE command was designed to manually add partitions that are added to or removed from the file system, but are not present in the Hive metastore. By running ALTER TABLE ... DROP PARTITION ... you are only deleting the data and metadata for the matching partitions, not the partitioning of the table itself. This task assumes you created a partitioned external table named emp_part that stores partitions outside the warehouse. Drop multiple partitions With the below alter script, we provide the exact partitions we would like to delete. Hive does not accept subquery in that DDL clause, but this works: ALTER TABLE myTable DROP PARTITION (date < 'date1') , PARTITION (date >'date2'); It needs literals for 'date1' and 'date2'. Partitioning is also one of the core strategies to improve query performance in a hive. It simply sets the Hive table partition to the new location. Support Questions Find answers, ask questions, and share your expertise cancel. Partitioning is an important concept in Hive that partitions the table based on data by rules and patterns. Turn on suggestions.