tanclary commented on code in PR #3234:
URL: https://github.com/apache/calcite/pull/3234#discussion_r1253664463
##########
core/src/main/java/org/apache/calcite/runtime/SqlFunctions.java:
##########
@@ -1524,6 +1524,139 @@ public static int multiply(int b0, int b1) {
throw notArithmetic("*", b0, b1);
}
+ /** Helper method for safe arithmetic functions that checks if overflow has
occurred. */
+ private static boolean isOverflow(BigDecimal ans, BigDecimal min, BigDecimal
max) {
+ return ans.compareTo(min) > 0 || ans.compareTo(max) < 0;
+ }
+
+ /** SQL <code>SAFE_MULTIPLY</code> function applied to integer values. */
+ public static @Nullable Integer safeMultiply(int b0, int b1) {
+ BigDecimal ans = multiply(BigDecimal.valueOf(b0), BigDecimal.valueOf(b1));
+ boolean overflow = isOverflow(ans, BigDecimal.valueOf(Integer.MAX_VALUE),
+ BigDecimal.valueOf(Integer.MIN_VALUE));
+ return overflow ? null : ans.intValue();
+ }
+
+ /** SQL <code>SAFE_MULTIPLY</code> function applied to integer and double
values. */
+ public static @Nullable Double safeMultiply(int b0, double b1) {
+ BigDecimal ans = multiply(BigDecimal.valueOf(b0), BigDecimal.valueOf(b1));
+ boolean overflow = isOverflow(ans, BigDecimal.valueOf(Double.MAX_VALUE),
+ BigDecimal.valueOf(-Double.MAX_VALUE));
+ return overflow ? null : ans.doubleValue();
+ }
+
+ /** SQL <code>SAFE_MULTIPLY</code> function applied to integer and
BigDecimal values. */
+ public static @Nullable BigDecimal safeMultiply(int b0, BigDecimal b1) {
+ BigDecimal ans = multiply(BigDecimal.valueOf(b0), b1);
+ boolean overflow =
+ isOverflow(ans, BigDecimal.valueOf(Float.MAX_VALUE),
BigDecimal.valueOf(-Float.MAX_VALUE));
+ return overflow ? null : ans;
+ }
+
+ /** SQL <code>SAFE_MULTIPLY</code> function applied to integer and long
values. */
+ public static @Nullable Long safeMultiply(int b0, long b1) {
+ BigDecimal ans = multiply(BigDecimal.valueOf(b0), BigDecimal.valueOf(b1));
+ boolean overflow =
+ isOverflow(ans, BigDecimal.valueOf(Long.MAX_VALUE),
BigDecimal.valueOf(Long.MIN_VALUE));
+ return overflow ? null : ans.longValue();
+ }
+
+ /** SQL <code>SAFE_MULTIPLY</code> function applied to double and integer
values. */
+ public static @Nullable Double safeMultiply(double b0, int b1) {
+ BigDecimal ans = multiply(BigDecimal.valueOf(b0), BigDecimal.valueOf(b1));
+ boolean overflow = isOverflow(ans, BigDecimal.valueOf(Double.MAX_VALUE),
+ BigDecimal.valueOf(-Double.MAX_VALUE));
+ return overflow ? null : ans.doubleValue();
+ }
+
+ /** SQL <code>SAFE_MULTIPLY</code> function applied to double values. */
+ public static @Nullable Double safeMultiply(double b0, double b1) {
+ BigDecimal ans = multiply(BigDecimal.valueOf(b0), BigDecimal.valueOf(b1));
+ boolean overflow = isOverflow(ans, BigDecimal.valueOf(Double.MAX_VALUE),
+ BigDecimal.valueOf(-Double.MAX_VALUE));
+ return overflow ? null : ans.doubleValue();
+ }
+
+ /** SQL <code>SAFE_MULTIPLY</code> function applied to double and BigDecimal
values. */
+ public static @Nullable BigDecimal safeMultiply(double b0, BigDecimal b1) {
+ BigDecimal ans = multiply(BigDecimal.valueOf(b0), b1);
+ boolean overflow =
+ isOverflow(ans, BigDecimal.valueOf(Float.MAX_VALUE),
BigDecimal.valueOf(-Float.MAX_VALUE));
+ return overflow ? null : ans;
+ }
+
+ /** SQL <code>SAFE_MULTIPLY</code> function applied to double and long
values. */
+ public static @Nullable Long safeMultiply(double b0, long b1) {
+ BigDecimal ans = multiply(BigDecimal.valueOf(b0), BigDecimal.valueOf(1));
+ boolean overflow =
+ isOverflow(ans, BigDecimal.valueOf(Long.MAX_VALUE),
BigDecimal.valueOf(Long.MIN_VALUE));
+ return overflow ? null : ans.longValue();
+ }
+
+ /** SQL <code>SAFE_MULTIPLY</code> function applied to BigDecimal and
integer values. */
+ public static @Nullable BigDecimal safeMultiply(BigDecimal b0, int b1) {
+ BigDecimal ans = multiply(b0, BigDecimal.valueOf(b1));
+ boolean overflow =
+ isOverflow(ans, BigDecimal.valueOf(Float.MAX_VALUE),
BigDecimal.valueOf(-Float.MAX_VALUE));
+ return overflow ? null : ans;
+ }
+
+ /** SQL <code>SAFE_MULTIPLY</code> function applied to BigDecimal and double
values. */
+ public static @Nullable BigDecimal safeMultiply(BigDecimal b0, double b1) {
+ BigDecimal ans = multiply(b0, BigDecimal.valueOf(b1));
+ boolean overflow =
+ isOverflow(ans, BigDecimal.valueOf(Float.MAX_VALUE),
BigDecimal.valueOf(-Float.MAX_VALUE));
+ return overflow ? null : ans;
+ }
+
+ /** SQL <code>SAFE_MULTIPLY</code> function applied to BigDecimal values. */
+ public static @Nullable BigDecimal safeMultiply(BigDecimal b0, BigDecimal
b1) {
+ BigDecimal ans = multiply(b0, b1);
+ boolean overflow =
+ isOverflow(ans, BigDecimal.valueOf(Float.MAX_VALUE),
BigDecimal.valueOf(-Float.MAX_VALUE));
Review Comment:
I agree with both of you, `Double` makes more sense than `Float`. I've
changed it.
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