Add support for standard interval literals with precision #3481
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H2 allowed to specify leading field precision and fractional seconds precision only in interval data types, but not in literals of this data type.
In the SQL Standard, interval literals may also have these parameters and they are really required for some other database systems for large values.
This PR doesn't modify the declared data type of literals like
INTERVAL '10' YEAR. It should beINTERVAL YEAR, notINTERVAL YEAR(18). I think we need to fix that, but only in the next series of releases.