Alter Table Columns

Apply various modifications to columns in a table, view. The available modifications include the following:

Create or delete an index on a particular column. This can speed up certain operations when using expressions containing equality or relational operators on indexed columns. This only applies to tables.

Manage a table's columns--a column can be added, removed, or have its type and properties modified.

Set or unset compression for a column.

Input Parameter Description

Name	Type	Description
table_name	string	Table on which the operation will be performed. Must be an existing table or view.
column_alterations	array of maps of string to strings	list of alter table add/delete/change column requests - all for the same table. each request is a map that includes 'column_name', 'action' and the options specific for the action, note that the same options as in alter table requests but in the same map as the column name and the action. For example: [{'column_name':'col_1','action':'change_column','rename_column':'col_2'}, {'column_name':'col_1','action':'add_column', 'type':'int','default_value':'1'} ]
options	map of string to strings	Optional parameters.

Output Parameter Description

Name	Type	Description
table_name	string	Table on which the operation was performed.
type_id	string	return the type_id (when changing a table, a new type may be created)
type_definition	string	return the type_definition (when changing a table, a new type may be created)
properties	map of string to arrays of strings	return the type properties (when changing a table, a new type may be created)
label	string	return the type label (when changing a table, a new type may be created)
column_alterations	array of maps of string to strings	list of alter table add/delete/change column requests - all for the same table. each request is a map that includes 'column_name', 'action' and the options specific for the action, note that the same options as in alter table requests but in the same map as the column name and the action. For example: [{'column_name':'col_1','action':'change_column','rename_column':'col_2'}, {'column_name':'col_1','action':'add_column', 'type':'int','default_value':'1'} ]
info	map of string to strings	Additional information.