Github user jinfengni commented on the pull request:
https://github.com/apache/drill/pull/439#issuecomment-200883747
Looks like the root cause of the problem is Calcite does not allow the
comparison of Date and Timestamp.
{code}
select CAST('1990-01-01' AS DATE) < CAST('2001-01-01' AS TIMESTAMP) FROM
(VALUES(1, 2)) AS T(A,B);
Mar 24, 2016 8:15:53 AM
org.apache.calcite.sql.validate.SqlValidatorException <init>
SEVERE: org.apache.calcite.sql.validate.SqlValidatorException: Cannot apply
'<' to arguments of type '<DATE> < <TIMESTAMP(0)>'. Supported form(s):
'<COMPARABLE_TYPE> < <COMPARABLE_TYPE>'
{code}
Postgres, on the country, supports date vs timestamp compare, through
implicit cast.
{code}
select CAST('1990-01-01' AS DATE) < CAST('2001-01-01' AS TIMESTAMP) FROM
(VALUES(1, 2)) AS T(A,B);
?column?
----------
t
(1 row)
{code}
I looked through SQL standard, and could not find the rules for the
implicit cast, which means different system could choose it's own
interpretation. (In other words, it's hard to argue what Calcite is doing is
not right)
What Sean is trying to do with his proposal is to replace Calcite's between
operator with Drill's between operator, so that the checkOperand will use
Drill's rule.
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