tanclary commented on code in PR #3234:
URL: https://github.com/apache/calcite/pull/3234#discussion_r1282152026
##########
core/src/main/java/org/apache/calcite/runtime/SqlFunctions.java:
##########
@@ -1592,6 +1592,87 @@ public static int multiply(int b0, int b1) {
throw notArithmetic("*", b0, b1);
}
+ /** SQL <code>SAFE_MULTIPLY</code> function applied to long values. */
+ public static @Nullable Long safeMultiply(long b0, long b1) {
+ try {
+ return Math.multiplyExact(b0, b1);
+ } catch (ArithmeticException e) {
+ return null;
+ }
+ }
+
+ /** SQL <code>SAFE_MULTIPLY</code> function applied to long and BigDecimal
values. */
+ public static @Nullable BigDecimal safeMultiply(long b0, BigDecimal b1) {
+ BigDecimal ans = BigDecimal.valueOf(b0).multiply(b1);
+ return safeDecimal(ans) ? ans : null;
+ }
+
+ /** SQL <code>SAFE_MULTIPLY</code> function applied to BigDecimal and long
values. */
+ public static @Nullable BigDecimal safeMultiply(BigDecimal b0, long b1) {
+ BigDecimal ans = b0.multiply(BigDecimal.valueOf(b1));
+ return safeDecimal(ans) ? ans : null;
+ }
+
+ /** SQL <code>SAFE_MULTIPLY</code> function applied to BigDecimal values. */
+ public static @Nullable BigDecimal safeMultiply(BigDecimal b0, BigDecimal
b1) {
+ BigDecimal ans = b0.multiply(b1);
+ return safeDecimal(ans) ? ans : null;
+ }
+
+ /** SQL <code>SAFE_MULTIPLY</code> function applied to double and long
values. */
+ public static @Nullable Double safeMultiply(double b0, long b1) {
+ double ans = b0 * b1;
+ return safeDouble(ans) || !Double.isFinite(b0) ? ans : null;
+ }
+
+ /** SQL <code>SAFE_MULTIPLY</code> function applied to long and double
values. */
+ public static @Nullable Double safeMultiply(long b0, double b1) {
+ double ans = b0 * b1;
+ return safeDouble(ans) || !Double.isFinite(b1) ? ans : null;
+ }
+
+ /** SQL <code>SAFE_MULTIPLY</code> function applied to double and BigDecimal
values. */
+ public static @Nullable Double safeMultiply(double b0, BigDecimal b1) {
+ double ans = b0 * b1.doubleValue();
+ return safeDouble(ans) || !Double.isFinite(b0) ? ans : null;
+ }
+
+ /** SQL <code>SAFE_MULTIPLY</code> function applied to BigDecimal and double
values. */
+ public static @Nullable Double safeMultiply(BigDecimal b0, double b1) {
+ double ans = b0.doubleValue() * b1;
+ return safeDouble(ans) || !Double.isFinite(b1) ? ans : null;
+ }
+
+ /** SQL <code>SAFE_MULTIPLY</code> function applied to double values. */
+ public static @Nullable Double safeMultiply(double b0, double b1) {
+ double ans = b0 * b1;
+ boolean isFinite = Double.isFinite(b0) && Double.isFinite(b1);
+ return safeDouble(ans) || !isFinite ? ans : null;
+ }
+
+ /** Helper for the safe arithmetic functions to determine
+ * overflow for a BigDecimal value. According to BigQuery, BigDecimal
+ * overflow occurs if the precision is greater than 76 or the scale
+ * is greater than 38. */
+ private static boolean safeDecimal(BigDecimal b) {
+ return b.scale() <= 38 && b.precision() <= 76;
+ }
+
+ /** Helper for the safe arithmetic functions to determine
Review Comment:
Done
##########
core/src/main/java/org/apache/calcite/adapter/enumerable/RexImpTable.java:
##########
@@ -2369,6 +2372,30 @@ private static class LastDayImplementor extends
MethodNameImplementor {
}
}
+ /** Implementor for the {@code SAFE_MULTIPLY} function. */
+ private static class SafeArithmeticImplementor extends MethodNameImplementor
{
+ SafeArithmeticImplementor() {
+ super("safeMultiply", NullPolicy.STRICT, false);
+ }
+
+ @Override Expression implementSafe(final RexToLixTranslator translator,
+ final RexCall call, final List<Expression> argValueList) {
+ Expression arg0 = convertType(argValueList.get(0), call.operands.get(0));
+ Expression arg1 = convertType(argValueList.get(1), call.operands.get(1));
+ return Expressions.call(SqlFunctions.class, "safeMultiply", arg0, arg1);
+ }
+
+ // Because BigQuery treats all int types as aliases for BIGINT (Java's
LONG)
Review Comment:
Done
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