normanj-bitquill commented on code in PR #3927:
URL: https://github.com/apache/calcite/pull/3927#discussion_r1727999298
##########
testkit/src/main/java/org/apache/calcite/test/SqlOperatorTest.java:
##########
@@ -15523,6 +15523,58 @@ void checkBitAnd(SqlOperatorFixture f0, FunctionAlias
functionAlias) {
f0.forEachLibrary(list(functionAlias.libraries), consumer);
}
+ @Test public void testBitCountFunc() {
+ final SqlOperatorFixture f = fixture();
+ f.setFor(SqlStdOperatorTable.BITCOUNT, VmName.EXPAND);
+ f.checkFails("bitcount(^*^)", "Unknown identifier '\\*'", false);
+ f.checkType("bitcount(1)", "BIGINT NOT NULL");
+ f.checkType("bitcount(CAST(2 AS TINYINT))", "BIGINT NOT NULL");
+ f.checkType("bitcount(CAST(2 AS SMALLINT))", "BIGINT NOT NULL");
+ f.checkType("bitcount(CAST(x'ad' AS BINARY(1)))", "BIGINT NOT NULL");
+ f.checkFails("^bitcount(1.2)^",
+ "Cannot apply 'BITCOUNT' to arguments of type
'BITCOUNT\\(<DECIMAL\\(2, 1\\)>\\)'\\. Supported form\\(s\\):
'BITCOUNT\\(<INTEGER>\\)'\n"
+ + "'BITCOUNT\\(<BINARY>\\)'",
+ false);
+ f.checkFails(
+ "^bitcount()^",
+ "Invalid number of arguments to function 'BITCOUNT'. Was expecting 1
arguments",
+ false);
+ f.checkFails(
+ "^bitcount(1, 2)^",
+ "Invalid number of arguments to function 'BITCOUNT'. Was expecting 1
arguments",
+ false);
+ f.checkScalar("bitcount(8)", "1", "BIGINT NOT NULL");
+ f.checkScalar("bitcount(CAST(x'ad' AS BINARY(1)))", "5", "BIGINT NOT
NULL");
+ f.checkNull("bitcount(cast(NULL as TINYINT))");
+ f.checkNull("bitcount(cast(NULL as BINARY))");
+ }
+
+ @Test public void testBitCountMySQLFunc() {
Review Comment:
The input number is converted to a 64-bit integer using two's complement. It
will count the bits set in this, so `bitcount(-1)` will return `64`.
Added a test.
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