Mickaël Sauvée created CALCITE-2818:
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Summary: Implementation of Extract (ExtractImplementor) returns
wrong result for dates before Epoch.
Key: CALCITE-2818
URL: https://issues.apache.org/jira/browse/CALCITE-2818
Project: Calcite
Issue Type: Bug
Reporter: Mickaël Sauvée
Assignee: Julian Hyde
Computation is based on Java modulo that have a certain behaviour on negative
number.
For extracting hour, minutes and seconds, the computation is wroing. HJere is
an example on hour extract.
30-12-1969T21:13:20+0 is -100 000 000 in milisec relative to EPoch.
(-100 000 000 % 86 400 000) / 3 600 000 = -3,77 , so 3 hour is returned, and it
should be 21.
For negative input value, it is required to add unit.multiplier.longValue()
(ie. 8 640 000 in hour case) to the value before dividing it.
You can use this test (SQLOperatorBaseTest.java):
{code:java}
@Test public void testExtractWithDatesBeforeUnixEpoch() {
tester.checkScalar(
"extract(hour from TIMESTAMP '1969-12-31 21:13:20')",
"21",
"BIGINT NOT NULL");
}{code}
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