Improved error messages for duplicate or unknown columns in table constraints

Detail name	Value
Changelog Number	11726
Type	Improvement
Status	Resolved
Fix Versions	Exasol 8.7.0, Exasol 7.1.16
Resolution Date	2022-11-01

Improvement

Improved error messages when adding an invalid constraint to a table
e.g.

create table T1 (A int, B int, partition by A, A);
-- Returns the error "duplicate column A in partition key"

create table T2 (A int, distribute by C);
-- Returns the error "column C not found in distribution key"

Changed behavior

Improved error messages when adding an invalid constraint to a table