WebJan 31, 2024 · Significant changes to an existing column like renaming it or changing its data type are fine too. However the data type of the distribution column cannot be altered. This column determines how table data distributes through the cluster, and modifying its data type would require moving the data. Attempting to do so causes an error: WebJun 25, 2024 · While it is possible to modify the t column directly on the catalog increasing the type modifier length, this is not possible on the pk column because the pg_attribute.attlen is not a real value rather a copy of pg_type.typlen as shown in the pg_attribute documentation .
Citus Tips for Postgres: How to alter distribution key ... - Citus Data
WebMar 22, 2024 · cannot change data type of view column from numeric to numeric (4,1) I'm trying to calculate a ratio with 1 decimal place. So I created a view using. create or replace view MyView as select cast (A/B as numeric (4, 1)) as ratio from MyTable; WebALTER TABLE books ALTER COLUMN publication_date SET DATA TYPE date; ERROR: column "publication_date" cannot be cast automatically to type date HINT: You might need to specify "USING publication_date::date". SQL state: 42804. chubbs classic
Altering a table storage, distribution policy in Greenplum
WebOct 17, 2024 · Copy the privileges set on the original table to the newly created table. 3. Generate statistics on the newly created table. 4. Rename (or drop) the original table. 5. Rename the newly created table to replace the original table. For example. -- Review current distribution key of original table. WebMar 20, 2024 · You cannot specify any other column options such as data types, collation, or nullability. Each of these attributes is derived from the results of the SELECT statement. However, you can use the SELECT statement to change the attributes. For an example, see Use CTAS to change column attributes. Table distribution options WebJul 29, 2024 · Greenplum is a base on MPP architecture where data equally distributes across the child segments. Before creating a table, we should analyze the distribution logic and define distribution keys where data must be unique for equal distribution. My suggestion: Once you distribute your data basis on defined distribution key, you … design a school on mars