Dwrite commented on code in PR #4478:
URL: https://github.com/apache/calcite/pull/4478#discussion_r2312234135
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core/src/main/java/org/apache/calcite/runtime/SqlFunctions.java:
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@@ -3506,6 +3506,152 @@ private static ByteString binaryOperator(
return new ByteString(result);
}
+ /**
+ * Performs bitwise shift on two integers.
+ * If the shift amount is positive, a left shift is applied.
+ * If the shift amount is negative, a logical right shift is applied.
+ * The shift amount is taken modulo 32.
+ */
+
+ public static int leftShift(int x, int y) {
+ int shift = Math.abs(y % 32);
+ return y >= 0 ? x << shift : x >>> shift;
+ }
+
+ /**
+ * Performs bitwise shift on a long value.
+ * If the shift amount is positive, a left shift is applied.
+ * If the shift amount is negative, a logical right shift is applied.
+ * The shift amount is taken modulo 64.
+ */
+
+ public static long leftShift(long x, int y) {
+ int shift = Math.abs(y % 64);
+ return y >= 0 ? x << shift : x >>> shift;
+ }
+
+ /**
+ * Performs bitwise shift with long shift amount.
+ * Note: input x is int, so shift mod 32 is used.
+ * Returns long to prevent overflow.
+ */
+ public static long leftShift(int x, long y) {
+ int shift = (int) Math.abs(y % 32);
+ return y >= 0 ? (long) x << shift : (long) x >>> shift;
+ }
+
+ /**
+ * Performs bitwise shift on a byte array.
+ * A positive shift amount performs a left shift.
+ * A negative shift amount performs a logical right shift.
+ */
+ public static ByteString leftShift(ByteString bytes, int y) {
+ byte[] result = leftShift(bytes.getBytes(), y);
+ return new ByteString(result);
+ }
+
+ /**
+ * Performs bitwise shift on a byte array.
+ * A positive shift amount performs a left shift.
+ * A negative shift amount performs a logical right shift.
+ */
+ public static byte[] leftShift(byte[] bytes, int y) {
Review Comment:
I think
```
f.checkScalar("CAST(X'4000' AS BINARY(2)) << 1", "8000", "BINARY(2) NOT
NULL");
f.checkScalar("CAST(X'0F' AS BINARY(1)) << -4", "f0", "BINARY(1) NOT
NULL");
``` already cover this fun.
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