julianhyde commented on code in PR #3253:
URL: https://github.com/apache/calcite/pull/3253#discussion_r1224902007
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testkit/src/main/java/org/apache/calcite/test/SqlOperatorTest.java:
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@@ -9641,6 +9641,12 @@ void testTimestampDiff(boolean coercionEnabled) {
"2015-01-01", "DATE NOT NULL");
f.checkScalar("date_trunc(date '2015-02-19', isoyear)",
"2014-12-29", "DATE NOT NULL");
+ f.checkScalar("date_trunc(date '2015-02-19', decade)",
Review Comment:
Add a comment that DECADE rolls down to 0 mod 10, CENTURY and MILLENNIUM
roll down to 1 mod 100 and 1 mod 1000. That behavior is surprising to some
people.
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