Impala add column to existing table

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August undefined, 2024

Witryna13 cze 2024 · 1 Answer Sorted by: 0 LongType is dataframe datatype not spark SQL datatype which if you scroll down in your error message you will see So in spark sql use below query spark.sql ("ALTER TABLE deltatable ADD COLUMNS (abc Long, dea Long AFTER ttt)") Share Improve this answer Follow answered Jun 13, 2024 at 20:08 … Witryna20 lip 2024 · INSERT OVERWRITE TABLE db_name.parquet_table PARTITION (year = 0, month = 0, day = 0) SELECT field1,..., fieldn --do not include partitioned columns …

INSERT Statement - The Apache Software Foundation

WitrynaThe syntax CREATE EXTERNAL TABLE sets up an Impala table that points at existing data files, potentially in HDFS locations outside the normal Impala data directories.. This operation saves the expense of importing the data into a new table when you already have the data files in a known location in HDFS, in the desired file format. Witryna11 sty 2024 · Show 2 more comments. 1. Hive doesn't support updates (or deletes), but it supports INSERT INTO, so it is possible to add new rows to an existing table. > insert overwrite table table_name > select *, case when [condition] then 1 else flag_col end as flag_col, from table_name //If you want to use you can add where// > where id <> 1; … can i scan photos at cvs

python 3.x - spark sql alter table to add more columns - Stack …

Witryna1 lip 2024 · After adding new columns in Kudu tables from impala, I had some issues computing stats for this table. Everything works fine until the Compute Stats … Witryna13 maj 2015 · As far as I see there are only 3 solutions to your usecase 1. If INSERT INTO is being used, then you have to deal with duplicate records, Since your partition column is country. 2. If INSERT OVERWRITE is used, (which I think is best for your usecase) then deletion and then insertion will happen. Witryna30 sie 2016 · 1 Answer Sorted by: 1 If I'm not mistaken, impala supports case: selec id, field_a, field_b, case when field_a is not null then field_a else field_b end as field_c … can i scan on this tablet

Using the Parquet File Format with Impala Tables

Witryna8 lut 2016 · CREATE TABLE NEWPARTITIONING ( COLUMNS ... ) PARTITON ON ( MONTHS INT, DAY INT ) as SELECT * from tablewitholdpartitioning. Loading a large number of partitions at a time can result in bad loading patterns so be careful and follow the guidelines in my doc: http://www.slideshare.net/BenjaminLeonhardi/hive-loading … WitrynaCurrently, Impala can only insert data into tables that use the text and Parquet formats. For other file formats, insert the data using Hive and use Impala to query it. As an alternative to the INSERT statement, if you have existing data files elsewhere in HDFS, the LOAD DATA statement can move those files into a table. five letter words using altWitryna15 lut 2024 · CREATE TABLE TABLE_3 AS WITH TABLE_1 AS ( SELECT * FROM SOMEWHERE_1 ), TABLE_2 AS ( SELECT * FROM SOMEWHERE_2 ) SELECT … five letter words using an

"Witryna29 kwi 2024 · Adding or Removing Columns. You can add one or more columns to the end of the column list using ADD COLUMNS , or (with Impala only) you can delete … " - Impala add column to existing table

Impala add column to existing table

Witryna28 lip 2024 · 1. I went through the Cloudera docs. It doesn't mention how to add a column to an existing view. Is it because there is no way to achieve that? If I use … Witryna28 lut 2024 · Insert columns into a table with Table Designer In Object Explorer, right-click the table to which you want to add columns and choose Design. Select the first blank cell in the Column Name column. Type the column name in the cell. The column name is a required value.

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WitrynaTo reorganize columns for a table: You can add multiple columns at a time using the ALTER TABLE statement. If you specify the IF NOT EXISTS clause, Impala silently …

Witryna2 paź 2024 · To reorganize columns for a table: You can add multiple columns at a time using the ALTER TABLE statement. If you specify the IF NOT EXISTS clause, Impala silently ignores the ADD request and does not return an error if a column with … Note: In the impala-shell interpreter, a semicolon at the end of each statement … Witryna29 gru 2024 · By default, Kudu tables created through Impala use a tablet replication factor of 3. To specify the replication factor for a Kudu table, add a TBLPROPERTIES clause to the CREATE TABLE statement as shown below where n is the replication factor you want to use: TBLPROPERTIES ('kudu.num_tablet_replicas' = 'n')

Witryna7 sty 2024 · 2. Since you provide only NULL, the DB can not determince which data type you want for that new table column. Try casting the NULL value to the type you want. … WitrynaThen you can use INSERT to create new data files or LOAD DATA to transfer existing data files into the new table. CREATE TABLE columns_from_data_file LIKE PARQUET '/user/etl/destination/datafile1.dat' STORED AS PARQUET; In this example, the new table is partitioned by year, month, and day.

Witryna19 maj 2016 · CREATE TABLE blah_copy LIKE blah INSERT INTO TABLE blah_copy SELECT * FROM blah. It looks to create the table for me when I run because they …

Witryna21 gru 2024 · You do not modify columns. You read, change, then re-write. One way to complete the above concept in hive query language: select parquet into a non parquet table, do your work to modify the new table, update the new column, etc, then select back into a new parquet table with the new schema. You can also do some of the … five letter words using alWitryna28 sty 2024 · I am trying to count the number of columns in a table in Impala. ... Add a column with a default value to an existing table in SQL Server. 2354. How to concatenate text from multiple rows into a single text string in SQL Server. 849. five letter words using a l pWitrynaImpala can create tables containing complex type columns, with any supported file format. Because currently Impala can only query complex type columns in Parquet tables, creating tables with complex type columns and other file formats such as … five letter words using a o lWitrynaThe ALTER TABLE statement is used to add, delete, or modify columns in an existing table. The ALTER TABLE statement is also used to add and drop various constraints … five letter words using alienWitryna15 sie 2024 · 1 Answer Sorted by: 5 If you don't mind to replicate the column information at record level, you can do this CREATE TABLE new_table PARTITIONED BY (id_partition) STORED AS PARQUET AS SELECT *, id as id_partition FROM old_table You will not be able to do it in a different way in Impala. five letter words using aleWitrynaIn Impala 1.4.0 and higher, you can derive column definitions from a raw Parquet data file, even without an existing Impala table. For example, you can create an external table pointing to an HDFS directory, and base the column definitions on one of the files in that directory: can i scan photos at fedexWitryna10 gru 2015 · After a lot of mistakes, in addition to above explanations, I would add simpler answers. Case 1: Add new column named new_column. ALTER TABLE schema.table_name ADD new_column INT COMMENT 'new number column'); Case 2: Rename a column new_column to no_of_days. five letter words using a s