Major Description
Updating column types to interval types are prohibited for V2 source tables.
So, if we attempt to update the type of a column to the conventional interval type, an error message like "Error in query: Cannot update <table> field <column> to interval type;".
But, for year-month/day-time interval types, another error message like "Error in query: Cannot update <table> field <column>:<type> cannot be cast to interval year;"
It's not consistent.
