abhishekrb19 commented on code in PR #19386:
URL: https://github.com/apache/druid/pull/19386#discussion_r3230268244
##########
processing/src/test/java/org/apache/druid/math/expr/ExprTest.java:
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@@ -221,6 +221,27 @@ public void testEqualsContractForNullDoubleExpr()
.verify();
}
+ /**
+ * now() depends on wall-clock time, so its cache key must not be stable
across calls — otherwise queries containing
+ * now() can hit a stale cached result. NowExpression overrides {@link
Expr#decorateCacheKeyBuilder} to mix in
+ * nanoTime, which makes any containing Expr produce a fresh key on every
{@link Expr#getCacheKey()} call.
Review Comment:
Removed this test doc altogether
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