17.10 - Changing a Column Data Type and Statistics - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL Data Definition Language Detailed Topics

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Release Date
July 2021
Content Type
Programming Reference
Publication ID
B035-1184-171K
Language
English (United States)

If you change a column data type using an ALTER TABLE request, all the statistics on a base table that reference the column are no longer used. Recollecting the statistics on the modified column makes them usable again.