strongduanmu commented on code in PR #4074:
URL: https://github.com/apache/calcite/pull/4074#discussion_r1881183482
##########
core/src/main/java/org/apache/calcite/runtime/SqlFunctions.java:
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@@ -2916,6 +2916,46 @@ public static long bitCount(ByteString b) {
return bitsSet;
}
+ /** Helper function for implementing MySQL <code>BIT_COUNT</code>. Counts
the number
+ * of bits set in a boolean value. */
+ public static long bitCountMySQL(Boolean b) {
+ return Long.bitCount(b ? 1L : 0L);
+ }
+
+ /** Helper function for implementing MySQL <code>BIT_COUNT</code>. Counts
the number
+ * of bits set in a string value. */
Review Comment:
This is MySQL BIT_COUNT function document -
https://dev.mysql.com/doc/refman/8.4/en/bit-functions.html#bit-operations-bit-count,
but unfortunately, it does not describe the details about the BIT_COUNT
function. These special behaviors of BIT_COUNT come from actual tests with
MySQL.
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