ZheHu created CALCITE-5800: ------------------------------ Summary: NVL function should respect implicit conversion among the arguments Key: CALCITE-5800 URL: https://issues.apache.org/jira/browse/CALCITE-5800 Project: Calcite Issue Type: Bug Components: core Affects Versions: 1.34.0 Reporter: ZheHu Assignee: ZheHu
The following SQLs in SqlOperatorTest would fail as the NVL function(enabled in Oracle) has "SAME_SAME" operand checker. However, they both result in "1" in Oracle. {code} select nvl(1, '2') as alia from dual; {code} {code} select nvl('1', 2) as alia from dual; {code} According to [Oracle-NVL|https://docs.oracle.com/en/database/oracle/oracle-database/19/sqlrf/NVL.html#GUID-3AB61E54-9201-4D6A-B48A-79F4C4A034B2], if arguments' data types are different, then Oracle Database implicitly converts one to the other. Conversion rules(take *nvl(expr1, expr2)* as example): # If expr1 is character data, then Oracle Database converts expr2 to the data type of expr1 before comparing them and returns VARCHAR2 in the character set of expr1 # If expr1 is numeric, then Oracle Database determines which argument has the highest numeric precedence, implicitly converts the other argument to that data type, and returns that data type -- This message was sent by Atlassian Jira (v8.20.10#820010)