Github user twalthr commented on the issue:
https://github.com/apache/flink/pull/2348
The first line is Scala Table API, second line is Java Table API and the
string with the INTERVAL prefix is standard SQL. So we cannot change the
standard ;)
Yes, I think that is the reason. Calcite does it like that and Oracle too.
https://docs.oracle.com/cd/B19306_01/server.102/b14200/sql_elements003.htm#i38598
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