clintropolis commented on code in PR #13809:
URL: https://github.com/apache/druid/pull/13809#discussion_r1119968736
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processing/src/main/java/org/apache/druid/math/expr/vector/VectorProcessors.java:
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@@ -778,6 +842,15 @@ public ExprEvalVector<long[]> asEval()
);
}
+ /**
+ * Creates an {@link ExprVectorProcessor} for the logical 'and' operator,
which produces a long typed vector output
+ * with values set by the following rules:
+ * true/true -> true (1)
+ * true/null, null/true, null/null -> null
+ * false/null, null/false -> false (0)
Review Comment:
yeah, SQL compat stuff. `null` is basically a stand-in for "unknown" for
logical operations,```true && ???``` could be `true` or `false` depending on
the value of `???` so the result is `???`. But ```false && ???``` is definitely
false no matter the value of `???`.
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