Fix ArgumentException : Column 'SQL_TYPE_NAME' does not belong to table DataTypes (#3438)

[shessane]

Fix for #3438

Data types will be included in the DB2 reserved words, only if a a column existes with the name "SQL_TYPE_NAME". If not il will not throw an ArgumentException : Column 'SQL_TYPE_NAME' does not belong to table DataTypes.

This PR includes only the uncaught exception. But if you are ok I can add a fallback to the TypeName column if the first does not exist.

[fredericDelaporte]

This is fixing a regression introduced in 5.3 by #2058.

Shouldn't we re-target this on the 5.3.x branch?

[bahusoid]

Shouldn't we re-target this on the 5.3.x branch?

Up to you. Should we also re-target mysql appveyour fix?

[fredericDelaporte]

It would be required, unless overlooking its failure on that branch.

No longer think it is right changes

[hazzik]

This fix is not entirely correct. DB2400Dialect should use own metadata and not trying to add some fallbacks to a sister-dialect's metadata.

[shessane]

Agree, but since the DB2AS400 inherit the implementation, I thought this was the simplest fix without breaking the logic.

I can cancel the PR, up to you

Edit : I will propose a better implementation with inherited DB2AS400Dialect