caicancai commented on code in PR #3689:
URL: https://github.com/apache/calcite/pull/3689#discussion_r1495195172
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core/src/main/java/org/apache/calcite/runtime/SqlFunctions.java:
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@@ -2788,6 +2788,18 @@ public static double log(BigDecimal d0, BigDecimal d1) {
return Math.log(d0.doubleValue()) / Math.log(d1.doubleValue());
}
+ /** SQL {@code LOG2(number)} function applied to double values. */
+ public static double log2(double d0) {
+ return (Double.isInfinite(log(d0, 2)) && d0 == 0.0) ? Double.NaN : log(d0,
2);
Review Comment:
Because - infinity and + infinity are special cases in SQL and do not
support parsing, so I added the condition here that d0 == 0. At present, only
the log2 (0) test is controversial.
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