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################################################################################ # inc/gcol_dependencies_on_gcol.inc # # # # Purpose: # # Testing scenarios when columns depend on generated columns, i.e. such as # # - a generated column is based on a generated column # # - a "real" column on which a generated one is renamed/dropped # # - a generated column involved in partitioning is renamed/dropped # # # #------------------------------------------------------------------------------# # Original Author: Andrey Zhakov # # Original Date: 2008-09-02 # # Change Author: # # Change Date: # # Change: # ################################################################################ --echo # Can't define a generated column on another generated column --error ER_VCOL_BASED_ON_VCOL create table t1 (a int, b int generated always as (a+1) virtual, c int generated always as (b+1) virtual); create table t1 (a int, b int generated always as (a+1) virtual); --error ER_VCOL_BASED_ON_VCOL alter table t1 add column c int generated always as (b+1) virtual; drop table t1; --echo # Can't rename or drop a column used in the function of a generated column create table t1 (a int, b int generated always as (a+1) virtual); --echo # On renaming/dropping a column on which a virtual field is --echo # defined the following error is displayed: --echo # "Unknown column 'a' in 'generated column function'" --error 1054 alter table t1 drop column a; --error 1054 alter table t1 change a c int; drop table t1; --echo # Can't rename or drop a generated column used by the paritition function create table t1 (a int, b int generated always as (a+1) virtual) partition by hash(b); --error 1054 alter table t1 drop b; --error 1054 alter table t1 change b c int generated always as (a+1) virtual;