Cast date to timestamp results in "ERROR 42846: Cannot convert types 'DATE' to
'TIMESTAMP'."
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Key: DERBY-896
URL: http://issues.apache.org/jira/browse/DERBY-896
Project: Derby
Type: Bug
Versions: 10.1.2.1
Environment: --------- Derby Information --------
JRE - JDBC: J2SE 1.4.2 - JDBC 3.0
[D:\Programme\Derby\bin\lib\derby.jar] 10.1.2.1 - (330608)
[D:\Programme\Derby\bin\lib\derbytools.jar] 10.1.2.1 - (330608)
Reporter: Oleksandr Alesinskyy
Cast date to timestamp results in "ERROR 42846: Cannot convert types 'DATE' to
'TIMESTAMP'.",
e.g. in ij:
select cast(cast ('2006-01-01' as date) as timestamp) from sys.sysschemas;
or
select cast (current_date as timestamp) from bradi_dat.lpaip01;
The similar issue exists for time ("ERROR 42846: Cannot convert types 'TIME' to
'TIMESTAMP'.",
Documentation clearly states that these conversions are allowed, see table 1 in
a description of CAST function in the Derby Reference Manual and comment about
"Conversion of date/time values" below that table (see below as well).
Conversions of date/time values
A date/time value can always be converted to and from a TIMESTAMP. If a DATE is
converted to a TIMESTAMP, the TIME component of the resulting TIMESTAMP is
always
00:00:00. If a TIME data value is converted to a TIMESTAMP, the DATE component
is
set to the value of CURRENT_DATE at the time the CAST is executed. If a
TIMESTAMP
is converted to a DATE, the TIME component is silently truncated. If a
TIMESTAMP is
converted to a TIME, the DATE component is silently truncated.
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