zoudan commented on code in PR #3214:
URL: https://github.com/apache/calcite/pull/3214#discussion_r1203314154
##########
core/src/main/java/org/apache/calcite/runtime/SqlFunctions.java:
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@@ -1854,6 +1854,20 @@ public static double acos(double b0) {
return Math.acos(b0);
}
+ // ACOSH
+ /** SQL <code>ACOSH</code> operator applied to BigDecimal values. */
+ public static double acosh(BigDecimal b0) {
+ return acosh(b0.doubleValue());
+ }
+
+ /** SQL <code>ACOSH</code> operator applied to double values. */
+ public static double acosh(double b0) {
+ if (b0 < 1) {
+ throw new IllegalArgumentException("Input parameter of acosh cannot be
less than 1!");
+ }
+ return Math.log(Math.sqrt(b0 * b0 - 1.0) + b0);
Review Comment:
https://en.wikipedia.org/wiki/Inverse_hyperbolic_functions
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