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Posted to dev@calcite.apache.org by "fangyc (JIRA)" <ji...@apache.org> on 2019/04/24 11:08:00 UTC
[jira] [Created] (CALCITE-3019) User defined scalar function which
returns a Date/Timestamp value causes error.
fangyc created CALCITE-3019:
-------------------------------
Summary: User defined scalar function which returns a Date/Timestamp value causes error.
Key: CALCITE-3019
URL: https://issues.apache.org/jira/browse/CALCITE-3019
Project: Calcite
Issue Type: Bug
Components: core
Affects Versions: 1.19.0
Reporter: fangyc
I've defined a user defined function that returns a date or timestamp and register it on root schema :
{quote} public static java.sql.Date test(long value) {
return new java.sql.Date(value);
}
{quote}
{quote}rootSchema.add("my_test", ScalarFunctionImpl.create(CalciteTest.class, "test"));
{quote}
If I use this function in the select part of a query as the only column, the result works fine:
{quote}select my_test(1) from northwind.product
{quote}
However, if I add an additional column in the select part, the error occurs:
{quote}select my_test(1), 2 from northwind.product
{quote}
Error message:
{quote} Exception in thread "main" java.lang.ClassCastException: java.sql.Date cannot be cast to java.lang.Number
at org.apache.calcite.avatica.util.AbstractCursor$NumberAccessor.getNumber(AbstractCursor.java:726)
at org.apache.calcite.avatica.util.AbstractCursor$DateFromNumberAccessor.getDate(AbstractCursor.java:915)
at org.apache.calcite.avatica.AvaticaSite.get(AvaticaSite.java:326)
at org.apache.calcite.avatica.AvaticaResultSet.getObject(AvaticaResultSet.java:393)
{quote}
I tried with calcite.debug=true, and the difference seems as follows:
* 1 column
{quote}/* 51 */ public Object current() {
/* 52 */ return org.apache.calcite.runtime.SqlFunctions.toIntOptional(CalciteTest.test(1));
/* 53 */ }
{quote} * 2 columns
{quote}/* 51 */ public Object current() {
/* 52 */ return new Object[] {
/* 53 */ CalciteTest.test(1),
/* 54 */ 2};
/* 55 */ }
{quote}
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